Table height adjustment mechanism challenge

109 comments

• 

  Tim Anderson over 12 years ago

  Hi Jury,

  Looks like an interesting challenge. I am a little confused about the spec. It looks like you want the table to have a 100mm height change. What is the height range you are looking for ie. starting height and max adjusted height?

  Tim Anderson has uploaded 18 CAD models & has left 12 comments.
• 

  smmoosavian over 12 years ago

  Is the table completely horizontal or some slope is needed ?

  smmoosavian has uploaded 23 CAD models & has left 34 comments.
• 

  Nuno Felix over 12 years ago

  does it have to be completely manual? Can it be pneumatic or hydraulic?

  Nuno Felix has uploaded 302 CAD models & has left 188 comments.
• 

  William over 12 years ago

  This will be a nice little comp but I am the same as Tim a little confused to the dimensions also?
  Also what materials has the table to be?
  sheet metal?
  wood?
  and so on.....
  Thank you.

  William has uploaded 112 CAD models & has left 6922 comments.
• 

  Chris Duncan over 12 years ago

  The height change dims are in the picture on the left side.
  the very first requirement is manually driven
  Pretty sure this is metal.

  500kg load seems like a lot if you are going to manually drive it 15mm/s

  Chris Duncan has uploaded 20 CAD models & has left 142 comments.
• 

  xristos over 12 years ago

  It needs about 75 watts without frictions for these speed and load . It cant be handmovied , because i think that mean people can produce up to 40 Watt by hand.

  xristos has uploaded 13 CAD models & has left 26 comments.
• 

  Erkki Kiviniemi over 12 years ago

  Thank you for the comments. Some answers:
  - 100mm is not enough for height change, it should be app. 400mm (650mm to 1050mm)
  - Table top is completely horizontal, but if you have a solution, which give also possibility to change angle of the table top; by all means.
  - Mechanism has to work without external energy supply (electricity, pressure air, hydraulic etc.)
  - Frame of the table is steel, but we are open for other materials also. The table top is made from wood material.
  - Yes; 500kg is quite heavy to lift manually with speed 15mm/s. Indeed it needs 75W and it is too much, if a person has to produce the power “on line”. But perhaps there are possibilities to use a stored energy… Anyway, we are open for all ideas, even you think that your idea do not work with 500kg.

  Erkki Kiviniemi has uploaded 0 CAD models & has left 13 comments.
• 

  Adam Pohl (POHL3D) over 12 years ago

  Erkki Is it possible to get a model (STEP) of the sides so we can incorporate our design directly into the leg?

  Adam Pohl (POHL3D) has uploaded 100 CAD models & has left 1219 comments.
• 

  Tim Anderson over 12 years ago

  Thanks for the clarification. I think I am on track for an excellent solution. It looks like we are re-designing the concept work table. What sort of cost target are we looking at? ie under $500 US in materials and labor? I see that the current design retails for around $2300 US.

  Tim Anderson has uploaded 18 CAD models & has left 12 comments.
• 

  Martin Camirand over 12 years ago

  I would like to know with what kind of increment the table should move between 650 and 1050. Does it have to be able to spot every 1 mm, 10 mm, 100 mm etc. Thanks.

  Martin Camirand has uploaded 3 CAD models & has left 37 comments.
• 

  Tanel Välja over 12 years ago

  Heippa Erki, millaisia moottoreitä käytetään nyt pöytäissä?

  Tanel Välja has uploaded 25 CAD models & has left 33 comments.
• 

  Danny Tasmakis over 12 years ago

  Hi Erkki,
  Is it possible to get an idea on the mechanism Sovella is using for the height adjustment currently, there's no use coming up with something we think is innovative if it's already incorporated in the current design :)

  Danny Tasmakis has uploaded 55 CAD models & has left 654 comments.
• 

  Emil over 12 years ago

  you are asking accuracy for a positioning 1 mm 10 mm ?

  Emil has uploaded 14 CAD models & has left 37 comments.
• 

  Zoran Andjelic over 12 years ago

  Erkki Is it possible to get a model (STEP) of the sides so we can incorporate our design directly into the leg?
  I repeat Adam Pohl's question because I wont to use your standard shapes too.
  Section view would be enough.

  Zoran Andjelic has uploaded 64 CAD models & has left 87 comments.
• 

  Karco over 12 years ago

  Tanel, sorry, but... It would be desirable that talk, in these cases, all a common language, that everything that can respond from Sovella interests us all possible participants.
  It is only my opinion. Thanks a lot.

  Karco has uploaded 163 CAD models & has left 739 comments.
• 

  Erkki Kiviniemi over 12 years ago

  Thank you for the good questions and comments. Here answers:
  - STEP –models are soon available
  - Target for the production cost of whole table frame should be under 350USD. Due to the competitive situation production cost is quite sensitive matter and ideas, which decrease production cost are welcome.
  - It would be good if move (positioning) of the table is stepless or steps are as small as possible.
  - At the moment we have motorized table and hand-crank table. In the motorized table are used Linak’s actuators and control boxes. In the hand-crank tables are used our own mechanism, which base on gear wheels and screws.
  - Positioning accuracy between left and right leg of the table is important, because table top mast be all a time as straight as possible.

  Erkki Kiviniemi has uploaded 0 CAD models & has left 13 comments.
• 

  Erkki Kiviniemi over 12 years ago

  Unfortunately we have not good 3D –models from components of the table, because original design is relative old and it has been designed in 2D. We have only “principal” 3D -models. From those models I took couple pictures, which hopefully helps.

  I highlight that new solution is not needed to put into existing table structure. Because almost all big components of the frame are made from steel sheet, they are relatively easy to modify according to needs. It is enough if you just follow Sovella design style in general level. Fortunately our design style is not "thin"; relatively fat bars are used.

  Erkki Kiviniemi has uploaded 0 CAD models & has left 13 comments.
• 

  Martin Camirand over 12 years ago

  Thanks you for the infos M. Kiviniemi.
  Now i'm gona explore solutions with a continuous movement insted of the step by step or slotted positionning.

  Martin Camirand

  Martin Camirand has uploaded 3 CAD models & has left 37 comments.
• 

  Martin Camirand over 12 years ago

  Hi there,
  Me again, I know the maximum lifting weight should be 500Kg but it this is also the maximum rated weight to put on the table ?

  I need to know this to make sure that the weight put on the table won't push down the mechanical component used to hold the table height.

  Thanks

  Martin

  Martin Camirand has uploaded 3 CAD models & has left 37 comments.
• 

  Erkki Kiviniemi over 12 years ago

  Hello all,
  500kg includes also the moving part of the table; "net load" is 500kg minus weight of the moving frame. We consider the matter this way, because our tables can be equipped with upright tubes, evaporated plates etc. and thus the weight margin for customers own "net load" varies.

  The position of the weight can be consider to divide evenly on a table top.

  Erkki Kiviniemi has uploaded 0 CAD models & has left 13 comments.
• 

  Johannes Alderse Baas over 12 years ago

  Looks like a great competition!

  Johannes Alderse Baas has uploaded 6 CAD models & has left 29 comments.
• 

  Sergiej over 12 years ago

  @Erkki Kiviniemi - I have a question. You say that you have mechanism based on screws and gears - so we can use gears and screws or maybe we should use somekind other mechanism?

  Sergiej has uploaded 0 CAD models & has left 6 comments.
• 

  Erkki Kiviniemi over 12 years ago

  Hello,
  We have no particular reason to use screws and gears. So, you are free to use whatever mechanism, which is realistically thinkable with this kind product.

  Erkki Kiviniemi has uploaded 0 CAD models & has left 13 comments.
• 

  Sergiej over 12 years ago

  @Erkki Kiviniemi - (btw sorry for my lng skills) No, no... I mean... You are using now screws+gears, yes? :) Yes :) Can we use them to in our designs? :) or maybe we should find diferent mechanism?

  Sergiej has uploaded 0 CAD models & has left 6 comments.
• 

  Chris Duncan over 12 years ago

  Erkki, I would suggest you put all the main points you have made in these discussions into your requirements/rules at the top. You may get better results that way. I don't think everyone will read through all these comments to see $350 target, 500kg gross, etc. The more detailed description of what you want, the better results you will get. Thank you, it's a nice contest and a generous prize amount.

  Chris Duncan has uploaded 20 CAD models & has left 142 comments.
• 

  Chris Duncan over 12 years ago

  Sergiej. Erkki is saying...Use any mechanism you want to meet the design rules.

  Chris Duncan has uploaded 20 CAD models & has left 142 comments.
• 

  Chris Duncan over 12 years ago

  Erkki,

  What is the production cost for the existing manual adjust table frame?

  What is the production cost of just the existing table frame without the adjustment mechanism?

  Guessing that you want this mechanism to work with all the table sizes including the smallest 1000mm x 600mm?

  Chris Duncan has uploaded 20 CAD models & has left 142 comments.
• 

  Erkki Kiviniemi over 12 years ago

  Main points from this comment chain have been added to the requirements list, so you do not need read through whole chain.

  Operate principle of our current hand-crank table:
  Hand-crank shaft is connected to the bevel gear, which drives width direction shaft, which is connected to the bevel gears in both legs. Bevel gears of legs drive screws, which move the table top.

  It is possible to use our existing components, but I feel it is better that you do not stuck on them. Finally we have to anyway finish your models for our production and in this stage we can use our existing components if it is reasonable. So, be free with your ideas.

  I am sorry, but exact production costs of current products are trade secrets. Anyway, do not hesitate to give proposal even you think that cost is bit too much; the idea can be commercially good after small modification.

  It is target that a mechanism is able to scale all table sizes. Table size 1000mm x 600mm is not so important, but it is positive thing if the idea is able to scale to this size also.

  Erkki Kiviniemi has uploaded 0 CAD models & has left 13 comments.
• 

  Hevi over 12 years ago

  I think that it's hard to meet criteria of cost (350USD) when someone will choose somekind of energys storage :) It's nice competiton but I think it's very difficult to meet of all criteria...
  But it's cool - I like it! :)

  Hevi has uploaded 40 CAD models & has left 469 comments.
• 

  Pierre over 12 years ago

  Erkki, can you convert the table, of example at the top, in .igs or .stp ?

  Pierre has uploaded 15 CAD models & has left 319 comments.
• 

  Pierre over 12 years ago

  do you want modify the design of the existing table or keep that for integrate a new mecanism ?

  thanks

  Pierre has uploaded 15 CAD models & has left 319 comments.
• 

  Erkki Kiviniemi over 12 years ago

  It would be possible to convert to e.g. igs –form. The problem is that the model is not according to real components; the model has been made for marketing etc. purposes. So, I think that it is easier that you model the components according needs of your idea.

  Yes, it is challenging to meet all criterions. But it is possible to develop good compromise…

  You do not need to follow exactly the design of the existing table. As I have told, new fresh ideas to adjust the height of a table top are most important.

  Erkki Kiviniemi has uploaded 0 CAD models & has left 13 comments.
• 

  Pierre over 12 years ago

  Ok :-) thanks

  Pierre has uploaded 15 CAD models & has left 319 comments.
• 

  Chris Duncan over 12 years ago

  Erkki, thanks for updating the list of requirements.

  can you say if the existing adjustable table frame is less than $350 production cost?

  Hevi, ""It's nice competiton but I think it's very difficult to meet of all criteria.""

  That is the definition of challenge ;<)

  Chris Duncan has uploaded 20 CAD models & has left 142 comments.
• 

  Hevi over 12 years ago

  @Chris Duncan - You are right... like I said... I like it :)

  Hevi has uploaded 40 CAD models & has left 469 comments.
• 

  Chris Duncan over 12 years ago

  For anyone to use in the challenge.

  Posted a SW file that is configurable for all the sizes of workbenches, also several of the sizes in step files

  Sovella Existing Workbench (15 sizes)
  Sovella, existing workbench

  Chris Duncan has uploaded 20 CAD models & has left 142 comments.
• 

  Pierre over 12 years ago

  coool =) thanks

  Pierre has uploaded 15 CAD models & has left 319 comments.
• 

  Erkki Kiviniemi over 12 years ago

  I can say from the production cost of existing hand-crank mechanism that depending on the model, it is not very far from 350USD. Of course ready to sale table includes many other costs.

  I have noticed that your ideas base on direct force transmission from hand to rising table top. I feel that it is quite difficult to meet the hand force, weight and speed requirements without energy storage or a weight balancing system; it is heavy to lift 500kg with speed 15mm/s. My guess is that an engineer, who has good solution for that part of the challenge, has good opportunity to win.

  Erkki Kiviniemi has uploaded 0 CAD models & has left 13 comments.
• 

  Chris Duncan over 12 years ago

  Discussion of stored energy, metal spring and gas shock.

  SHORT VERSION.
  Workbench weighs 100kg to 500kg. Metal and gas springs have fixed rates. You need to have adjustable spring mounting to change rate, optimum is from 100kg to 500kg adjustment range.

  Possible torsion coil spring with rotating end rate adjustment around a horizontal shaft/gear lift mechanism running leg to leg.

  Possible adjustable mount angle gas spring strut where angle changes leverage and rate.

  LONG VERSION
  In most cases where you have spring assist there is a fixed load. Think garage door or car hatch strut. All garage doors have spring assist with adjustable springs, all garage doors are a fixed load so that you adjust the spring once for whatever configuration of door and it is a fixed rate from then on.

  Car hatch struts are similar, they come with a fixed rate, enough to lift the hatch but no more. Otherwise it would be too hard to push the hatch closed. The only way to adjust them is to change to a different rate strut.

  With this challenge we have a workbench with a range of different weights. For this discussion let us say we could have different weight springs for each different size table. So let us talk about one size table, 1500x750. This table modeled at 3mm thick steel weighs about 75kg. Let us say it has 25kg of accessories, so 100kg unloaded weight. The table is rated at 500kg but unloaded it's only 1/5th of that weight. So what weight spring should we use?

  . There has to be a compromise. If the spring is 400kg then when the table is loaded to 500kg it will only be 100kg effort to lift. But then when it is lowered with no extra weight, it only weighs 100kg, so you will have to supply 300kg effort to lower the table with the 400kg spring. Same problem if the spring is only 200kg, then lifting 500kg takes 300kg effort. Adding to this problem is the fact that fixed springs have varying rates with 400mm of mechanism movement, as they extend the pressure drops.

  So you set the spring at the average weight, say 300kg. This is still a compromise, for instance in an application where the table is never loaded more than 130kg then it will be 270kg effort to lower which is more than the 130kg effort to raise with no spring assist at all.

  You clearly need a user adjustable spring if spring assist is used. It is also going to need some kind of indicator to show what the weight setting is. This is getting complex and expensive. Maybe a vertical coil spring at each end with some kind of screw adjustment.

  Now the question is what size is the range of adjustment? 100kg to 500kg would be optimum. But you also need to have 400mm travel. So with the table at the lowest height, a vertical coil spring (fully compressed) would have to adjust from 100kg to 500kg within a 550mm distance, and it has to supply that pressure with 400mm of travel. Just guessing this is not possible.

  One spring that's economical and can supply this adjustable range of pressure over the available distance would be a torsion coil spring. Probably mounted horizontally, the length of the table is the only place that would be long enough. So using a drive system with gears and a shaft that goes from leg to leg, with the torsion coil spring mounted around the drive shaft. How do you adjust it? Garage doors with torsion coil springs have a rotating adjustment at one end but they are hard to adjust and need a certain level of skill as there are safety issues. Maybe a user friendly method could be designed but it drives up the cost.

  Another possibility would be a gas spring strut with an adjustable mounting angle, that could go from aligning with the movement direction to an angle away from that direction, which changes leverage and thus force level. It also has to be user adjustable.

  One other way to partially address this problem would be to provide differing rate springs at purchase, but this would only work if the customer knew the weight range they needed and it was closer to 100kg than the 400kg maximum range.

  Chris Duncan has uploaded 20 CAD models & has left 142 comments.
• 

  Aleksandr over 12 years ago

  Технические расчеты делать надо?
  Как точно прорисовывать механизмы конструкции?

  Technical calculations do you want?
  How to draw exactly the mechanisms design?

  Aleksandr has uploaded 289 CAD models & has left 1512 comments.
• 

  Pierre over 12 years ago

  "One spring that's economical and can supply this adjustable range of pressure over the available distance would be a torsion coil spring. Probably mounted horizontally, the length of the table is the only place that would be long enough. So using a drive system with gears and a shaft that goes from leg to leg, with the torsion coil spring mounted around the drive shaft. How do you adjust it? Garage doors with torsion coil springs have a rotating adjustment at one end but they are hard to adjust and need a certain level of skill as there are safety issues. Maybe a user friendly method could be designed but it drives up the cost."

  this method is very expensive to product and apply on each table.

  tables made ​​by Sovella are made ​​to measure, at the request, sovella will change the power of the spring according to the option requested by the user. no?
  Same for the gas spring.

  Pierre has uploaded 15 CAD models & has left 319 comments.
• 

  Chris Duncan over 12 years ago

  Pierre, I think torsion coil spring running horizontal leg to leg is not that expensive. I think user friendly adjustment from 100kg to 400kg before movement is expensive.

  Chris Duncan has uploaded 20 CAD models & has left 142 comments.
• 

  Pierre over 12 years ago

  Ah yess. Sorry it's my english.. i don't understand all ^^. Like system of garage door ? Why not. I will try it. It's not expensive it's right, but not easy to apply that on each table :l no ? Why you don't try this concept ? :-)

  Pierre has uploaded 15 CAD models & has left 319 comments.
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  Pierre over 12 years ago

  adjustable mounting angle with a gas spring ? Yes it will be a good solution for modify the force. But it will be enought ?

  Pierre has uploaded 15 CAD models & has left 319 comments.
• 

  Chris Duncan over 12 years ago

  Voibor

  ""Technical calculations do you want?""

  Yes.

  1 compression coil spring, vertical in each leg.

  250kg maximum force with 400mm vertical table movement

  compressed 550mm

  extended 950mm

  adjustable force 50kg to 250kg, separate from vertical table movement

  do you think this is possible? I do not think so.

  Chris Duncan has uploaded 20 CAD models & has left 142 comments.
• 

  Chris Duncan over 12 years ago

  Pierre, yes coil spring in torsion (twisting) on shaft, like commercial garage door.

  Chris Duncan has uploaded 20 CAD models & has left 142 comments.
• 

  Josef over 12 years ago

  Great competition! This really bring the engineering skills to the test.
  I will definitely compete in this one, already have some ideas. Good luck everyone!

  Josef has uploaded 10 CAD models & has left 215 comments.
• 

  Pierre over 12 years ago

  it's right Joseph ! yes ! come on ! ^^ Good luck !

  Pierre has uploaded 15 CAD models & has left 319 comments.
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  Franky Devaere over 12 years ago

  yes, talking about engineering. This is ( was ) indeed a challenging one....

  Franky Devaere has uploaded 23 CAD models & has left 226 comments.
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  julius over 12 years ago

  hi there i cant see my work in the entries?

  julius has uploaded 78 CAD models & has left 48 comments.
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  julius over 12 years ago

  what will i do? thanks

  julius has uploaded 78 CAD models & has left 48 comments.
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  julius over 12 years ago

  already uploaded :) i just re upload it

  julius has uploaded 78 CAD models & has left 48 comments.
• 

  Erkki Kiviniemi over 12 years ago

  Hello All,

  Thank you for good debate. Now I think that you are in the challenge. You have also very interesting proposals...

  Somebody asked something about hand force calculations. Because we have to choice the winner without prototype, a theoretical calculation is needed to evaluate needed hand force.

  Erkki

  Erkki Kiviniemi has uploaded 0 CAD models & has left 13 comments.
• 

  Pierre over 12 years ago

  hi Erkki,

  on the design and system of the existing table, how do you calculate the rate of gearing for the force ? after or before choose the options for the table ?

  Pierre has uploaded 15 CAD models & has left 319 comments.
• 

  Pierre over 12 years ago

  the gear ratio is always fixed? thanks.

  Pierre has uploaded 15 CAD models & has left 319 comments.
• 

  Franky Devaere over 12 years ago

  May i ask what the purpose is of the small vertical cabinenet
  at the back of the workbench ? Is that a must-stay ?

  Franky Devaere has uploaded 23 CAD models & has left 226 comments.
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  Guillaume Cabandé over 12 years ago

  I'm taking the challenge ^^

  Guillaume Cabandé has uploaded 17 CAD models & has left 40 comments.
• 

  Chris Duncan over 12 years ago

  Franky,
  ""May i ask what the purpose is of the small vertical cabinet
  at the back of the workbench ?""

  I think that is just structure to make the frame rigid in the transverse direction
  Plus is gives something to bolt the accessories to.

  Chris Duncan has uploaded 20 CAD models & has left 142 comments.
• 

  Erkki Kiviniemi over 12 years ago

  Hello,
  The hand force, which is needed to use existing table with speed 15mm/s, is not measured. Anyway, the smaller needed hand force the better; we do not complain if you have a structure, which is possible to use with finger tips.

  The purpose of the vertical cabinet is to make structure more rigid and work as the structure where upright tubes etc. are connected. This cabinet move up and down with the table top.

  Erkki Kiviniemi has uploaded 0 CAD models & has left 13 comments.
• 

  Franky Devaere over 12 years ago

  "This cabinet move up and down with the table top". Okay, i was thinking how one would cope with the fact that suddenly all the attached equipment is suddenly 600 mm higher. But, if there is no problem, no problem.
  " we do not complain if you have a structure, which is possible to use with finger tips.", LOL

  Franky Devaere has uploaded 23 CAD models & has left 226 comments.
• 

  Pierre over 12 years ago

  "The hand force, which is needed to use existing table with speed 15mm/s, is not measured. Anyway, the smaller needed hand force the better"

  ok cool =)

  Pierre has uploaded 15 CAD models & has left 319 comments.
• 

  osiso over 12 years ago

  @Erkki,

  I'm using off-the-shelf hydraulic dampers for barbershop chairs rated at 300kgf a piece. Since these are off-the-shelf do you want any calculations?

  osiso has uploaded 5 CAD models & has left 11 comments.
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  Erkki Kiviniemi over 12 years ago

  Hello,
  “I'm using off-the-shelf hydraulic dampers for barbershop chairs rated at 300kgf a piece. Since these are off-the-shelf do you want any calculations?”
  If there is the ratio information available, it is relatively easy to calculate the needed using power. This information helps us to evaluate the proposal.

  Erkki Kiviniemi has uploaded 0 CAD models & has left 13 comments.
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  teotteblung over 12 years ago

  the winner gets 2000USD, but Sovella gets 350USD in each table they have sold. if they sold 100 table, 100x350=35000USD.. LOL

  teotteblung has uploaded 17 CAD models & has left 10 comments.
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  BackToDwgBoard over 12 years ago

  Several mechanisms already exist:

  http://www.mcmaster.com/#adjustable-height-table-legs/=fodbcq

  BackToDwgBoard has uploaded 0 CAD models & has left 1 comments.
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  Chris Duncan over 12 years ago

  Gas springs in the sizes needed

  http://indgassprings.com/pages/prod_c_size.html

  Technical info about gas springs

  http://indgassprings.com/pages/tech_intro.html

  Chris Duncan has uploaded 20 CAD models & has left 142 comments.
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  Chris Duncan over 12 years ago

  BackToDwgBoard 1 day ago

  ""Several mechanisms already exist:""

  Yes, if you only want 100kg @ 4mm/10minutes. ;>)

  Chris Duncan has uploaded 20 CAD models & has left 142 comments.
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  Franky Devaere over 12 years ago

  Ok, guys , nine hours to go. Lets hit 100 entries. Time to go to bed in Europe.

  Franky Devaere has uploaded 23 CAD models & has left 226 comments.
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  Johannes Alderse Baas over 12 years ago

  Hej guys!

  I found out almost to late!!
  But I made an idea CAD.

  Hope you'll like it!

  Johannes Alderse Baas has uploaded 6 CAD models & has left 29 comments.
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  Pierre over 12 years ago

  yes it's original =)

  Pierre has uploaded 15 CAD models & has left 319 comments.
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  Johannes Alderse Baas over 12 years ago

  Thanks!

  But I can't see it at the entries page ?

  Stepless Size

  Does anyone know why?

  Thanks in advance!

  Johannes Alderse Baas has uploaded 6 CAD models & has left 29 comments.
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  Chris Duncan over 12 years ago

  I posted my V-7.0 entry at 9:30pm, it said there was 2.5 hrs left, but it has not shown up?

  Chris Duncan has uploaded 20 CAD models & has left 142 comments.
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  Johannes Alderse Baas over 12 years ago

  Well,

  That makes the 2 of us...

  Johannes Alderse Baas has uploaded 6 CAD models & has left 29 comments.
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  Erkki Kiviniemi over 12 years ago

  THANK YOU FOR YOUR ACTIVITY WITH THE CHALLENGE!!

  We received 92 proposals, which is much more I expected; couple proposals can still come in after GrabCAD has solve the technical problem.

  To make evaluation work easier, I have divided requirements in three categories:
  1. Technical solution
  Method to adjust manually height of the table top
  Maximum moved weight is 500kg
  Height adjustment from 650mm to 1050mm
  Table top has to move on straight position
  Mechanism has to work without external energy supply (electricity, pressure air, hydraulic etc.)
  2. Usability
  Adjust speed with reasonable power has to be app. 15mm/s
  It would be good if move (positioning) of the table is stepless or steps are as small as possible
  Relatively weak person has to be able to use the solution
  Adjust work has to be easy to carry out
  3. Manufacturability in Sovella
  New solution must be simple, convenient, producible, reliable, strong and durable
  Solution should follow Sovella design style in general level
  Design must meet the dimensions shown on the picture
  Frame of the table is steel, but we are open for other materials also. The table top is made from wood material
  Target for the production cost of whole table frame should be under 350USD

  With all these three categories I give point from 4 to 10 to all candidates. Because there are easily +/-1 tolerance in my review, I take 20 top candidates to deeper evaluation. This group I put in to the ranking. This is my method; other members of the jury may use other method.

  THANK YOU
  Erkki

  Erkki Kiviniemi has uploaded 0 CAD models & has left 13 comments.
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  Kaspar Kiis over 12 years ago

  All who can't see your entries, please check if you have put the correct tag to your model. The tag should be: workbench

  Kaspar Kiis has uploaded 3 CAD models & has left 635 comments.
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  Johannes Alderse Baas over 12 years ago

  @ Kaspar Kiis!

  I added that tag now... Will it go to Sovella?
  I hope so!

  I geuss that is the 93'the entrie?

  Chris Duncan had the same problem..

  Here is a link: Stepless Size

  Johannes Alderse Baas has uploaded 6 CAD models & has left 29 comments.
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  Johannes Alderse Baas over 12 years ago

  Hi!

  I send an email to indrek@grabcad.com about this problem. (according to John Huizingh's hint)

  Hope it will be allright.

  Johannes Alderse Baas has uploaded 6 CAD models & has left 29 comments.
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  MehMade over 12 years ago

  I tagged correctly and upload before pass time, but already can't see my entry.

  Here it is, pls check http://grabcad.com/library/adjusting-height-table-workbench-sovella--1

  thank you!

  MehMade has uploaded 0 CAD models & has left 3 comments.
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  Kaspar Kiis over 12 years ago

  Can everybody take another look now? We want to make sure that all the entries are visible before we start the evaluation process.

  Kaspar Kiis has uploaded 3 CAD models & has left 635 comments.
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  Paul Tripon over 12 years ago

  Thanks Kaspar. Now we have the right number 99+1
  :))

  Paul Tripon has uploaded 75 CAD models & has left 2053 comments.
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  Franky Devaere over 12 years ago

  Hoi Kaspar. As you know, i have a private entry. It's impossible to share to indrek@grabcad.com on my page, so i emailed you and Indrek the link 7 days ago. Didn't get a email notification from Indrek but i guess it's OK, since you did.
  Regards.

  Franky Devaere has uploaded 23 CAD models & has left 226 comments.
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  yerraaditya over 12 years ago

  my modell is not into the entry list workbench for sovella ( hydrallic version)

  yerraaditya has uploaded 7 CAD models & has left 27 comments.
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  Franky Devaere over 12 years ago

  Hoi yerraaditya. Just spotted your entry. Tag with workbench, will you ?

  Franky Devaere has uploaded 23 CAD models & has left 226 comments.
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  yerraaditya over 12 years ago

  @FRANKY - TRIED IT BUT NO LUCK

  yerraaditya has uploaded 7 CAD models & has left 27 comments.
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  Franky Devaere over 12 years ago

  Did you submit on this challenge page ?

  Franky Devaere has uploaded 23 CAD models & has left 226 comments.
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  yerraaditya over 12 years ago

  YES , SHOULD I TRY IT AGAIN

  yerraaditya has uploaded 7 CAD models & has left 27 comments.
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  Franky Devaere over 12 years ago

  I see you have shared it with Kaspar and Indrek. So, do not worry.
  I couldn't share it, maybe because mine is private.

  Franky Devaere has uploaded 23 CAD models & has left 226 comments.
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  yerraaditya over 12 years ago

  @ FRANKY THANKS MAN , so that would be fine ??

  yerraaditya has uploaded 7 CAD models & has left 27 comments.
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  Franky Devaere over 12 years ago

  don't see why not. Their rule :"You may upload a private model but you need to share access to indrek@grabcad.com". So you uploaded a public model and shared it.
  I shared access to my file by email, because in my case it didn't work on the upload page.

  Franky Devaere has uploaded 23 CAD models & has left 226 comments.
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  Franky Devaere over 12 years ago

  There are some issues with private uploaded models. They do not appear in the entry list, which is no problem, but they also cannot be downloaded by the uploader. Sharing to jury member as stated in the rules isn't possible either. I shortly shifted to public, everything is downloadable and sharable.Previous placed comments appears on the home dialogue page. I shifted to private again. The comments on the home dialogue page are again gone. In fact one is not entirely sure that his model has entered the competition.

  Franky Devaere has uploaded 23 CAD models & has left 226 comments.
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  yerraaditya over 12 years ago

  @kaspear - did u receive my model - i shared with u as it was not showing up in the entry list >>
  thnx

  link - workbench for sovella ( hydrallic version)

  yerraaditya has uploaded 7 CAD models & has left 27 comments.
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  Brijen Parmar - CSWP over 12 years ago

  Dear Jury,
  Let us know when the results will be announced?

  Brijen Parmar - CSWP has uploaded 3 CAD models & has left 10 comments.
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  Kaspar Kiis over 12 years ago

  @Franky and @yerraaditya your entries are in the list now and handed over to the jury with the rest of the entries.

  Kaspar Kiis has uploaded 3 CAD models & has left 635 comments.
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  Franky Devaere over 12 years ago

  Ok, Kapsar !

  Franky Devaere has uploaded 23 CAD models & has left 226 comments.
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  yerraaditya over 12 years ago

  @kaspar - thnx

  yerraaditya has uploaded 7 CAD models & has left 27 comments.
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  Gabriel Goldman over 12 years ago

  @Kaspar, I am not sure if my model made it in the list. Can you confirm? Thanks for the help.

  Gabriel Goldman has uploaded 1 CAD models & has left 3 comments.
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  Erkki Kiviniemi over 12 years ago

  Hello all,

  The results will be published on Monday.

  Best Regards and Have a Nice Weekend
  Erkki

  Erkki Kiviniemi has uploaded 0 CAD models & has left 13 comments.
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  Pierre over 12 years ago

  ok =) nice weekend too

  Pierre has uploaded 15 CAD models & has left 319 comments.
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  yerraaditya over 12 years ago

  nice!!

  yerraaditya has uploaded 7 CAD models & has left 27 comments.
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  Kaspar Kiis over 12 years ago

  Congratulations to all the winners and many thanks to everybody participating in the contest. See you all on the next challenges!

  Kaspar Kiis has uploaded 3 CAD models & has left 635 comments.
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  Kaspar Kiis over 12 years ago

  Comment from Erkki Kiviniemi, Sovella:

  Thank you for all participants! It was big surprise how many proposals we received. Unfortunately it is not possible to give personal feedback to you; you would deserve that, because many of you have used lot of time with the challenge.
  
  Of course many of the proposals are not unknown for us, but there were many details we have never thought. Also many old ideas were applied in new innovative way. Many proposals did not included detailed review from needed using power; according to physics laws, it is not easy work to move vertically 500kg with speed 15mm/s. It is very probably that in the future we do not use any single proposal; instead we make a combination from our existing structure and many proposals.
  
  Well, it was not easy job to choose 10 best from 101 proposals; if the review would has done in next week, the results would be slightly different. For sure, by using same arguments we have used, there are another proposals, which would have deserved a price. But we had to make a choice. Thank you!

  Kaspar Kiis has uploaded 3 CAD models & has left 635 comments.
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  Kaspar Kiis over 12 years ago

  3rd place is Franky Devaere, workbench-table-hight-adjustment-mechanism-type2 Can you please upload it again as it is not anymore in the library. Thank you and congratulations!

  Kaspar Kiis has uploaded 3 CAD models & has left 635 comments.
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  Jovance Josev over 12 years ago

  The choice not been made according to the criteria laid down by your side. So the order of the places to be denied the award price of the 350th

  Jovance Josev has uploaded 14 CAD models & has left 33 comments.
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  Jovance Josev over 12 years ago

  Target for the production cost of whole table frame should be under 350USD
  ??????????

  Jovance Josev has uploaded 14 CAD models & has left 33 comments.
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  Jovance Josev over 12 years ago

  Best regarde !!!

  Jovance Josev has uploaded 14 CAD models & has left 33 comments.
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  Franky Devaere over 12 years ago

  there it is : http://www.listaintl.com/sites/default/files/Lista-Align-Adjustable-Height-Bench-Installation-Instructions-partially-assembled-SP001A3-vault.pdf

  Franky Devaere has uploaded 23 CAD models & has left 226 comments.
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  Johannes Alderse Baas over 12 years ago

  Wow.... Great job Franky..!

  Congrats!

  Johannes Alderse Baas has uploaded 6 CAD models & has left 29 comments.

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