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NASA Regolith Advanced Surface Systems Operations Robot (RASSOR) Bucket Drum Design Challenge

Medium

NASA is seeking to challenge the GrabCAD Community by sponsoring an open competition in which participants design a bucket drum for RASSOR that will provide the maximum amount of regolith extraction and retention while remaining free of obstructions during loading and unloading.

Regolith excavation is desired in future space missions for the purpose of In Situ Resource Utilization (ISRU) to make local commodities, such as propellants and breathing air, and to pursue construction operations.

RASSOR is a teleoperated mobile robotic platform with a unique space regolith excavation capability. Its design incorporates net-zero reaction force, thus allowing it to load, haul, and dump space regolith under extremely low gravity conditions with high reliability.

RASSOR uses counterrotating bucket drums on opposing arms to provide near-zero horizontal and minimal vertical net reaction force so that excavation is not reliant on the traction or weight of the mobility system to provide a reaction force to counteract the excavation force in low-gravity environments.

During loading, the bucket drums excavate soil/regolith by scoops mounted on the drums exteriors that sequentially take multiple cuts of soil/regolith while rotating at approximately 20 revolutions per minute. Inside the hollow drums are baffles that trap the regolith and prevent it from falling back out of the scoops. During hauling, the bucket drums are raised by rotating the arms to provide clearance above the surface being excavated. The mobility platform can then travel while the soil/regolith remains in the raised bucket drums. When the excavator reaches the dump location, the bucket drums are commanded to reverse their direction of rotation, which causes soil/regolith to be expelled out of each successive scoop.

For more information: https://technology.nasa.gov/patent/KSC-TOPS-7

https://www.researchgate.net/publication/261248231_Regolith_Advanced_Surface_Systems_Operations_Robot_RASSOR

RASSOR 1.0/1.5:
https://www.youtube.com/watch?v=d3zRvl2LYJ4&feature=emb_logo

https://www.researchgate.net/publication/261248231_Regolith_Advanced_Surface_Systems_Operations_Robot_RASSOR

RASSOR 2.0:
https://www.youtube.com/watch?v=rAIw7a2VfQ0

https://www.youtube.com/watch?v=sBod90pUfB0

Requirements

  • JUDGING CRITERIA

    1. Successful designs will have a fill ratio higher than 50%.

    2. Short description of how your design works and intended fill ratio

    3. Is the design real? Can the design work? Can it actually be created?

    4. Meets dimension requirements

    5. If the engineer can provide a simulation of the regolith grain, that is a plus.

  • Requirements needed for Submission:

    Maximum total width of scoops engaged at any given time: 175 mm
    Maximum bucket drum mass: 5 kg
    Maximum bucket drum diameter: 450 mm
    Maximum bucket drum length: 360 mm
    A minimum volume of regolith captured: 17.6 liters

  • Submission File Formats

    Renderings
    STEP of design(s)
    Final design STL
    Short description of design/how it works

Rules

  • ENTERING THE COMPETITION:


    If you think an entry may infringe on existing copyrighted materials, please email challenges@grabcad.com.


    By entering the Challenge you:

      1) Accept the official GrabCAD Challenges Terms & Conditions.
      2) Agree to be bound by the decisions of the judges (Jury).
      3) Warrant that you are eligible to participate.
      4) Warrant that the submission is your original work. Warrant, to the best of your knowledge, your work is not, and has not been in production or otherwise previously published or exhibited.
      5) Warrant neither the work nor its use infringes the intellectual property rights (whether a patent, utility model, functional design right, aesthetic design right, trademark, copyright or any other intellectual property right) of any other person.
      6) Warrant participation shall not constitute employment, assignment or offer of employment or assignment.
      7) Are not entitled to any compensation or reimbursement for any costs.
      8) Agree the Sponsor and GrabCAD have the right to promote all entries.

  • SUBMITTING AN ENTRY


    Only entries uploaded to GrabCAD through the "Submit entry" button on this Challenge page will be considered an entry. Only public entries are eligible. We encourage teams to use GrabCAD Workbench for developing their entries. Entries are automatically given the tag "NASADRUMCHALLENGE" when uploading to GrabCAD. Please do not edit or delete this tag. Only entries with valid tag will participate in the Challenge.

  • AWARDING THE WINNERS


    The sum of the Awards is the total gross amount of the reward. The awarded participant is solely liable for the payment of all taxes, duties and other similar measures if imposed on the reward pursuant to the legislation of the country of his/her residence, domicile, citizenship, workplace, or any other criterion of similar nature. Only 1 award per person. Prizes may not be transferred or exchanged. All winners will be contacted by the GrabCAD staff to get their contact information and any other information needed to get the prize to them. Payment of cash awards is made through PayPal. All team awards will be transferred to the member who entered the Challenge.

  • We will release the finalists before the announcement of the winners to give the Community an opportunity to share their favorites in the comments, discuss concerns, and allow time for any testing or analysis by the Jury. The Jury will take the feedback into consideration when picking the winners.


    Winning designs will be chosen based on the Rules and Requirements.

  • Schedule


    This Challenge ends on April 20th, 2020 (23:59 EST.) Finalists will be announced on April 27th, 2020. Winners will be announced on May 4th, 2020.

Prizes

Prize Winnings

$7000 in Prizes

First Place

$3000

Second Place

$2000

Third Place

$1000

Fourth Place

$750

Fifth Place

$250

About NASA Lunar Surface Innovation Initiative (LSII)

This challenge is sponsored by the NASA Lunar Surface Innovation Initiative (LSII) which is a technology development portfolio to enable human and robotic exploration on the Moon and future operations on Mars.

The RASSOR excavator was developed at NASA - Kennedy Space Center’s Swamp Works. Swamp Works is a technology development group with expertise in In-Situ Resource Utilization. The Swamp Works team uses lean and rapid design and development processes to develop prototype hardware for future missions.

75 comments

  • Tommy Mueller

    Tommy Mueller 17 days ago

    Looks like an excellent challenge, thanks for partnering up to make this happen! Pretty sure I got the scope of the challenge, but I have two quick questions:

    1) Is there an official 3D model of the RASSOR (minus the current drum) or at least some 2D drawings that us participants can use as a reference for design compatibility?

    2) What is the current “Fill Ratio” using the existing drum?

    Tommy Mueller has uploaded 212 CAD models & has left 1789 comments.
  • Daniel Rutkowski

    Daniel Rutkowski 16 days ago

    I have a few questions on the details of the current drum system.

    1) How are the drums mounted/driven?
    1b) Are the designs required to account for the mount/drive?
    2) What are the material/weight limitations of the designs?
    3) Could you provide some information or a video of the current challenges associated with the current design?

    Thank you

    Daniel Rutkowski has uploaded 0 CAD models & has left 2 comments.
  • sanjay padvi

    sanjay padvi 16 days ago

    I am bit confused statement in "Schedule" "This Challenge ends on March 16th, 2020 (23:59 EST.) " ....means ...what is deadline?

    sanjay padvi has uploaded 2 CAD models & has left 4 comments.
  • Jason Schuler

    Jason Schuler 16 days ago

    Tommy:
    1.) We do not have any CAD that we can share of the RASSOR geometry. This challenge is intended to focus on the bucket drum geometry that interacts with the dirt. The entries do not need to include details for interfacing with RASSOR.
    2.) The current fill ratio is between 35% - 40%

    Jason Schuler has uploaded 0 CAD models & has left 3 comments.
  • Jason Schuler

    Jason Schuler 16 days ago

    Daniel:
    1. a&b) See response to Tommy's question #1 above.
    2.) The maximum mass for the design is 5kg. The material choice is open however the existing drum uses a combination of carbon fiber and aluminum.
    3.) The current drum works without any issues however if we can increase the fill ratio it could save significant time/energy during a mission.

    Jason Schuler has uploaded 0 CAD models & has left 3 comments.
  • Jason Schuler

    Jason Schuler 16 days ago

    Sanjay:
    Thank you for catching that. It was a typo that has been fixed. The deadline is April 20th (23:59 EST)

    Jason Schuler has uploaded 0 CAD models & has left 3 comments.
  • joey bevilacqua

    joey bevilacqua 16 days ago

    How do you define the fill ratio?

    joey bevilacqua has uploaded 0 CAD models & has left 1 comments.
  • SHIKHAR SARASWAT

    SHIKHAR SARASWAT 15 days ago

    Really excited to participate in this..!!

    SHIKHAR SARASWAT has uploaded 0 CAD models & has left 1 comments.
  • Paul Desjardins

    Paul Desjardins 15 days ago

    The maximum mass is 5kg. The existing drum combines carbon fiber and aluminum. This call for a new design of digging device. I would suggest that the robot first scoops material in the (solid and resistant) drum to increase weight and allow drilling device of pretty well known design.

    Paul Desjardins has uploaded 0 CAD models & has left 1 comments.
  • Sava Savov

    Sava Savov 15 days ago

    So, there are four drums and the requirements are for one of them? Or the requirements are for one "total drum" for each of the two sides where the machine digs?

    Sava Savov has uploaded 20 CAD models & has left 120 comments.
  • Clint Gates

    Clint Gates 15 days ago

    Why is the design a combined digger and hopper? It's more efficient to have separate machines for the jobs. This applies to farming, mining, factories, and much more.

    Clint Gates has uploaded 0 CAD models & has left 2 comments.
  • Andrew Lesh

    Andrew Lesh 15 days ago

    Are there any CAD files or images you can share of RASSOR 2.0's drum? The IEEE paper you linked has an image of interior geometry of the RASSOR 1.0 drum (https://www.researchgate.net/profile/Rachel_Cox12/publication/261248231/figure/fig2/AS:702678908805125@1544543115946/Bucket-drum-without-end-cap-to-show-baffles-RASSORs-solution-to-the-issue-of.jpg), so it would be really helpful to see the geometry of the second revision as well.

    Andrew Lesh has uploaded 0 CAD models & has left 2 comments.
  • Andrew Lesh

    Andrew Lesh 15 days ago

    Also, what is the fill ratio of each RASSOR drum revision tested so far?

    Andrew Lesh has uploaded 0 CAD models & has left 2 comments.
  • Dodi Budzyn

    Dodi Budzyn 15 days ago

    Great challenge! I was trying to figure it out from rules but I still have dubts so I will just ask: are non US citizens and people who don't live in US allowed to take part in the competition? I am asking for all Europeans here:) Thanks in advance if somebody helps to figure it out!

    Dodi Budzyn has uploaded 0 CAD models & has left 1 comments.
  • Dhruv Gandhi

    Dhruv Gandhi 15 days ago

    does the bucket drum size specifications refer to the inner storage drum or the whole thing?

    Dhruv Gandhi has uploaded 5 CAD models & has left 12 comments.
  • Kamen Rusev

    Kamen Rusev 15 days ago

    My question is: it will work only on sand type of material or gravel and all kind of rock shapes?

    Kamen Rusev has uploaded 55 CAD models & has left 267 comments.
  • Jeffrey poe

    Jeffrey poe 14 days ago

    @ClintGates Because the extra weight and space would be exponentially more expensive. Also because a combine harvester doesn't fit in the shuttle cargo hold.

    Jeffrey poe has uploaded 0 CAD models & has left 4 comments.
  • Clint Gates

    Clint Gates 14 days ago

    @Jeffrey poe Reinventing the wheel should not be the goal.
    The current design has great mobility but will clog up because it does not have anything to grind the material. The only limiting factor to aggregate size is the openings of the buckets. While the base request for design is for increased fill of the barrel, the requirements also list, "5. If the engineer can provide a simulation of the regolith grain, that is a plus." This implies the current design has issues dealing with clogging, and material larger and more solid than loose soil. The current design will also suffer from torsion of the arms and barrels.

    Reduce the RASSOR size.
    Use existing boring / grinding technology to dig.
    Send at least one Bucket Drone along with the RASSOR. Making more should be a priority once onsite.
    Only Bucket Drones, aka Trucks, should be used to transport material.

    Remember, sometimes smaller is better. Use the weight and dimension restrictions for multiple proper tools instead of one tool that will break itself.

    Clint Gates has uploaded 0 CAD models & has left 2 comments.
  • Tucker Albright

    Tucker Albright 14 days ago

    Hi Jason, I have three questions.

    1. What is the torque and speed of the drum's drive system? Are you able to provide a torque/speed/power/efficiency curve? I understand we don't have to interface with the drive system for this challenge, but I would like to know these parameters as they effect the performance of the drum itself (i.e. too large a scoop may stall the system).

    2. Which type of lunar sites do you intend to mine from? Specifically, I'm interested in the particle size of your target sediment. Which version of lunar soil simulant (i.e. coarse JSC-1AC or fine JSC-1AF, etc) are you most interested in mining? Are you able to provide any material data?

    3. How fast do you plan to 'traverse' a digging site? In other words, what is the linear travel speed (not rotational speed) of the drum or rover so that it acquires new dirt? In which direction does the drum travel?

    Many thanks.

    Tucker Albright has uploaded 0 CAD models & has left 1 comments.
  • Dhruv Gandhi

    Dhruv Gandhi 14 days ago

    @kamen Regolith is the material on the surface of a planet/moon. it can be measure from 120 microns to 0.8 cm (got those figures from google)

    Dhruv Gandhi has uploaded 5 CAD models & has left 12 comments.
  • Joseph Gallagher

    Joseph Gallagher 13 days ago

    Does the approach used to mount the drum to the arm/drive system allow for the possibility of a stationary core to the drum, which does not rotate with the rest of the body?

    Joseph Gallagher has uploaded 0 CAD models & has left 1 comments.
  • Jean Alain Alphonse

    Jean Alain Alphonse 13 days ago

    How hard is the Regolith on the Mohs scale?

    Jean Alain Alphonse has uploaded 0 CAD models & has left 1 comments.
  • Daniel Voloshkevych

    Daniel Voloshkevych 13 days ago

    Is it allowed to be a student to take part of this challenge?

    Daniel Voloshkevych has uploaded 0 CAD models & has left 19 comments.
  • Jason Homrighaus

    Jason Homrighaus 13 days ago

    How are you defining "Fill Ratio"? Is that based on the total volume of the enclosing Boundary? Total Volume of the Open space of the Model? etc?

    Jason Homrighaus has uploaded 6 CAD models & has left 18 comments.
  • Kesa

    Kesa 13 days ago

    Daniel, You are allowed to enter this challenge.

    Kesa has uploaded 1 CAD models & has left 89 comments.
  • philippe jamel

    philippe jamel 12 days ago

    hello you can imagine a magnet neodym inside to collect more powder : it is a good 3d digger i see but powder is difficult : no water, to collect we put water

    philippe jamel has uploaded 0 CAD models & has left 1 comments.
  • ernie ascherman

    ernie ascherman 12 days ago

    Not looking to make a full submission but have an idea for the fill ratio issue: make a spiral shape inside the cylinder to keep the regolith from falling back out.

    ernie ascherman has uploaded 0 CAD models & has left 1 comments.
  • Anirudh Palaiya

    Anirudh Palaiya 12 days ago

    Do you have to be 18 years or older to participate in this challenge?

    Anirudh Palaiya has uploaded 0 CAD models & has left 1 comments.
  • Daniel Voloshkevych

    Daniel Voloshkevych 12 days ago

    Anirudh, no! ;) I am 17teen :)

    Daniel Voloshkevych has uploaded 0 CAD models & has left 19 comments.
  • Aadarsh K s

    Aadarsh K s 12 days ago

    Setup a hydraulic drill under the robot
    This drill help the robot to decrease the hardness of the soil
    When the hardness of the soil decreases vaccum the soil using a powerful vaccum
    Pump

    Aadarsh K s has uploaded 0 CAD models & has left 2 comments.
  • Aadarsh K s

    Aadarsh K s 12 days ago

    Setup a vaccum pump inside the drum so the soil will not go out of the drum

    Aadarsh K s has uploaded 0 CAD models & has left 2 comments.
  • Sava Savov

    Sava Savov 12 days ago

    But there is already vacuum up there on the Moon :)

    Sava Savov has uploaded 20 CAD models & has left 120 comments.
  • Damoor Sahami

    Damoor Sahami 11 days ago

    I'm no good at CAD. But my idea would be to replicate a sea (snail) shell, with a "double layered screw", one (outer layer) that drills up the material and then falls into the inner layer screw which is only a sealed container. The idea with this would also be to be able to drill deeper.

    Damoor Sahami has uploaded 0 CAD models & has left 1 comments.
  • Gewang Aquino

    Gewang Aquino 11 days ago

    Hi, question. Are we allow to use other softwares like sketchup?

    Gewang Aquino has uploaded 0 CAD models & has left 2 comments.
  • Daniel Voloshkevych

    Daniel Voloshkevych 11 days ago

    yes, I using Blender for that ;)

    Daniel Voloshkevych has uploaded 0 CAD models & has left 19 comments.
  • Raul Santos

    Raul Santos 11 days ago

    Algum software para simulação do grão de regolito?

    Raul Santos has uploaded 1 CAD models & has left 4 comments.
  • Divy patel

    Divy patel 9 days ago

    Do we have to use a 3d software for submission?

    Divy patel has uploaded 0 CAD models & has left 1 comments.
  • Kesa

    Kesa 9 days ago

    @Divy you have to create a CAD File so yes a 3D Software is required to create your submission

    Kesa has uploaded 1 CAD models & has left 89 comments.
  • geo

    geo 8 days ago

    Today I thought about the grabcad competition all day.
    Result:
    I think, the way with drums is wrong.
    Positive: Low dust generation from abrasive dust.
    Goods are packed securely for transport.
    Negative: stones block a closed system.
    Unloading problems.
    The machine with drums device must constantly leave the workplace.

    Suggestion:
    With an adjustable brake slide and corresponding angle when milling, you also have external 0 force.
    A milling machine that only milling and 2 transport trolleys that know automatic her way.

    https://www.asphalt.de/fileadmin/user_upload/downloads/dav/Herbst2017/01_2017-11_VESF_Fraesqualitaet_DAV.pdf

    geo has uploaded 22 CAD models & has left 706 comments.
  • Jacob Mosier

    Jacob Mosier 8 days ago

    Anyone know if there is a required/suggested materiel?

    Jacob Mosier has uploaded 0 CAD models & has left 2 comments.
  • RocketNut

    RocketNut 8 days ago

    I can not read web link.because it is in German.

    RocketNut has uploaded 36 CAD models & has left 52 comments.
  • RocketNut

    RocketNut 8 days ago

    An I quote from challenge out lined above:::
    ======================

    During loading, the bucket drums excavate soil/regolith by scoops mounted on the drums exteriors that sequentially take multiple cuts of soil/regolith while rotating at approximately 20 revolutions per minute. Inside the hollow drums are baffles that trap the regolith and prevent it from falling back out of the scoops. During hauling, the bucket drums are raised by rotating the arms to provide clearance above the surface being excavated. The mobility platform can then travel while the soil/regolith remains in the raised bucket drums. When the excavator reaches the dump location, the bucket drums are commanded to reverse their direction of rotation, which causes soil/regolith to be expelled out of each successive scoop.

    =============

    Meaning the drum is the correct.

    RocketNut has uploaded 36 CAD models & has left 52 comments.
  • Yoyo

    Yoyo 8 days ago

    So what is the minimum age required?

    Yoyo has uploaded 2 CAD models & has left 14 comments.
  • Sava Savov

    Sava Savov 8 days ago

    Yes, go in!

    Sava Savov has uploaded 20 CAD models & has left 120 comments.
  • Ananth Narayan

    Ananth Narayan 8 days ago

    Does the concept of bucket has to be modified or any new idea for the same purpose can be laid.?

    Ananth Narayan has uploaded 63 CAD models & has left 284 comments.
  • Bintang Farhan

    Bintang Farhan 8 days ago

    can we add electrical component to the design?

    Bintang Farhan has uploaded 0 CAD models & has left 13 comments.
  • Narendiran Rajasekar

    Narendiran Rajasekar 7 days ago

    yes we can add.

    Narendiran Rajasekar has uploaded 2 CAD models & has left 1 comments.
  • Trevor Jamieson

    Trevor Jamieson 7 days ago

    Why two rotating drums? Could this not also be accomplished by dragging a scoop/bucket behind the "rover" body? Similar concept to a scraper.
    A single arm attached near the midpoint would still allow for the device to be self righting. Easier to clean if clogged with wet material. Not really affected by material size being "mined". Fewer moving parts. Potentially faster.

    Trevor Jamieson has uploaded 0 CAD models & has left 1 comments.
  • Yoyo

    Yoyo 7 days ago

    How do you make a (Rassor) Drum that light?! Even out of carbon fiber!

    Yoyo has uploaded 2 CAD models & has left 14 comments.
  • mahboub el idrissi zakaria

    mahboub el idrissi zakaria 6 days ago

    I want to participate, can anyone help me how

    mahboub el idrissi zakaria has uploaded 0 CAD models & has left 1 comments.
  • V.Novacov

    V.Novacov 5 days ago

    Could you explain,how many drums have to be or what is the overal size of the drums( one or two).

    V.Novacov has uploaded 10 CAD models & has left 35 comments.
  • Jason Homrighaus

    Jason Homrighaus 5 days ago

    All of the information is in the above description under requirements, the only thing not immediately clear is that the requirements are for 1 drum(there will be 4 on the machine)

    Jason Homrighaus has uploaded 6 CAD models & has left 18 comments.
  • walter pfeiffer

    walter pfeiffer 5 days ago

    I think it is better to send an origami shop, with actuators on each leg to make it mobile and use it as a controlled environment to work.

    Outside put solar panels and inside a series of tesla charging modules to make the load wireless and that the work is done without stopping.

    We would put a conveyor belts to remove the waste material and when setting up several tents a large mobile area could be covered.
    ❤☜(゚ヮ゚☜)

    walter pfeiffer has uploaded 1 CAD models & has left 1 comments.
  • rahadyan muhammad

    rahadyan muhammad 3 days ago

    Hi Do we have to design the opening with minimum 5cm width(like older design) or we could make it smaller?

    rahadyan muhammad has uploaded 3 CAD models & has left 14 comments.
  • Captain Anonymous

    Captain Anonymous 2 days ago

    I don't like the design of the RASSOR rigolith excavator. Digging in dry sand is one thing, fairly easy. Digging in a field of mixed sand and and rocks of different shapes and sizes will be comletely different and more difficult. Add a little moisture from water or some other liquid and clumping or sticking to the inside will be a huge problem.

    The drums as they are, are prone to clogging with rocks or clumps of rigolith. Some rocks may make it in one way but then turn sideways when inside and form a clog.

    What happens when one side doesn't pick up anything and is empty? The whole device will be off balance and prone to tip on it's side.

    I feel a more open claw or bucket is needed. Something that can easily be cleaned out, no matter the consequence

    Captain Anonymous has uploaded 0 CAD models & has left 6 comments.
  • Jason Homrighaus

    Jason Homrighaus 2 days ago

    There is no rain on the Moon. Also reglith is a fairly fine material even its largest particles are quite small generally less than 1cm.

    Jason Homrighaus has uploaded 6 CAD models & has left 18 comments.
  • Daniel Voloshkevych

    Daniel Voloshkevych 2 days ago

    Captain Anonymous - NO your idea is completly Wrong!

    Daniel Voloshkevych has uploaded 0 CAD models & has left 19 comments.
  • Captain Anonymous

    Captain Anonymous 2 days ago

    We have no idea what we're going to run into on the surface moon or elsewhere. We've only landed on the moon around six times and barely scratched it's surface. Once we try and dig more than a couple inches everything could, and probably will, change. No it does not rain on the moon, but there are regions that still contain ice. If they are going to dig for ice with this device so they can produce oxygen, the drums will clog, guaranteed.

    Captain Anonymous has uploaded 0 CAD models & has left 6 comments.
  • Jason Homrighaus

    Jason Homrighaus 2 days ago

    I don't know Cap, those nasa guys seem pretty confident in their design parameters.

    Jason Homrighaus has uploaded 6 CAD models & has left 18 comments.
  • Jason Homrighaus

    Jason Homrighaus 2 days ago

    I mean the surface of the moon is effectively a vacuum which pretty much eliminates the possibility of moisture.

    Jason Homrighaus has uploaded 6 CAD models & has left 18 comments.
  • Jason Homrighaus

    Jason Homrighaus 1 day ago

    Does the Outside Diameter have to be fixed at all times or is it possible for it to have a Closed, Digging mode that is 450 and an open, Empty mode that is larger than 450?

    Jason Homrighaus has uploaded 6 CAD models & has left 18 comments.
  • Jason Homrighaus

    Jason Homrighaus 1 day ago

    Does the Drive system Use a Stepper/Feedback system allowing it to be positioned at a particular point in its rotation? Does it have the ability to operate at different speeds or is it a fixed speed setup?

    Jason Homrighaus has uploaded 6 CAD models & has left 18 comments.
  • javad kazemi

    javad kazemi 1 day ago

    Hi
    I am proud to work with good designers $ And thanks for the patience and accuracy of Julie's comments .
    I have the experience of designing a mahjong sample last year.
    Thank you so much for trusting a large group of NASA engineers and managers.
    I had three questions about the new challenge.
    1. Should the sampler sample from the surface, or do the layers below the soil surface sample? Or how deep should it penetrate the soil?
    2. Is the 5kg weight based on the gravity of the moon or the planet's gravity?
    3. How many drives can the drive bucket be able to drive?
    With respect
    javad kazemi

    javad kazemi has uploaded 18 CAD models & has left 31 comments.
  • Briac LE RAY

    Briac LE RAY 1 day ago

    Hello,
    I am asking the community working on this project.
    I do not have any license for a CAD (I wish I could use SolidWorks) and thus am struggling to try to have FreeCAD work, which is not a very successful task.
    Could you share which tools you are using for doing your prototypes, and which tool you use to make the animations? :)
    Cheers!
    Briac

    Briac LE RAY has uploaded 0 CAD models & has left 2 comments.
  • Jason Homrighaus

    Jason Homrighaus 1 day ago

    You might look at fusion 360. It is free to students, hobbists, and startups. Also Houdini offered a free non commercial version that is quite powerful but has a fairly steep learning curve. Lastly google sketch up is free.

    Jason Homrighaus has uploaded 6 CAD models & has left 18 comments.
  • Captain Anonymous

    Captain Anonymous 1 day ago

    Some others I might add are, Blender which is my go to tool kit for CAD. www.blender.org. An excellent program that will do everything you wish and it's absolutely free. Others that are equally as powerful are a couple of the more prominent game engines, Unreal Engine (www.unrealengine.com) and Unity (www.unity.com). Both of these are also free to download and use. But these two have licensing agreements when you make over a certain amount of money with them.

    No matter which program you end up with, there will be a steep learning curve. If you're new to CAD, expect at least a thousand of hours of learning to be some what proficient.

    Captain Anonymous has uploaded 0 CAD models & has left 6 comments.
  • Briac LE RAY

    Briac LE RAY about 18 hours ago

    Thank you for your comments Jason and Capt'ain! Much appreciated!

    Briac LE RAY has uploaded 0 CAD models & has left 2 comments.
  • Flaviano Crespi

    Flaviano Crespi about 13 hours ago

    @Briac LE RAY
    In addition to the other programs already reported, you could use: Creo Elements / Direct Modeling Express
    It is available for download and free use.
    It has a very rapid learning curve because it is totally non-parametric and history free.
    You will be able to see the tutorials on Youtube.
    It has the following limitations:
    - max 60 parts (enough for this project)
    - can export only in STL, not in STEP

    Flaviano Crespi has uploaded 308 CAD models & has left 1497 comments.
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