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How it is possible to model the spring start for a cavity as it is shown in image in solidworks.

By Theodore Chortatsos on 22 Apr 08:41 11 answers 915 views 0 comments

I want to design the internal cavity of a spring the first spiral must me like the attached image. Spring' dimensions also provided to have an idea what I a looking for.

Added images

Square

Attachments

Spring_and_Cavity.pdf, 380 KB
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11 answers

  • john fall
    john fall over 4 years ago

    see attached spring cavity model, It should be easy enough to follow, email me if you have any questions.

    Attachments

    spring_cavity.SLDPRT, 1.26 MB
    Download
  • Theodore Chortatsos
    Theodore Chortatsos over 4 years ago

    Thanks for your effort but that is already done. Maybe is my fault as I didn't state the problem correctly. The spring cavity has a "soft start" in the attached image. That is I want to model

  • john fall
    john fall over 4 years ago

    thanks easy just cut the same helix in the opposite direction from the first, if you want me to do this email.

  • Theodore Chortatsos
    Theodore Chortatsos over 4 years ago

    Ok. Amuse that we had the solid, we cut the helix in both directions and after that we create the the 5.52Dia taped cut.. This will cut the "thread" and it will look exact as you sent it.

  • john fall
    john fall over 4 years ago

    cut the new helix last

  • Theodore Chortatsos
    Theodore Chortatsos over 4 years ago

    Hi
    Thanks, It looks better but still not the same.
    The "thread" also is cut, that planar face that is created from the cut does not exist in the pic.
    I think the secret is to create the thread instant of "cutting" the spring.
    I tried using several ways.
    - To create the full thread profile - failed . ( the profile was intersecting and was unable to solve, the problem is that to sides of the thread profile must me tangent and same circle)
    - I tried to create the thread, without the 0.8 dia and with the same helix to add the 0.8dia circle - failed (because they are tangential zero thickness geometrey. Also fillet or fillet fillet face for 0.4R didn't work)
    - I tried to create the thread as surface and then cut from solid but also that didn't work.

    If there is anyone that can do in an other (solid) software you are welcome to describe the procedure

    PS. the cavity in the image was created in 3ds. I tried to read the STL data but the surface was too complex that a huge file was created.
    I am sure that there is a solution out there .

  • Theodore Chortatsos
    Theodore Chortatsos over 4 years ago

    No, but you gave me an I idea. I will try it and i will let you know.
    Thanks anyway

  • Theodore Chortatsos
    Theodore Chortatsos over 4 years ago

    John some times you need a push to do things. That was you gave me.
    Here is my file have a look and you are welcome for improvements.
    Thanks again

    Attachments

    Soft_start.SLDPRT, 3.74 MB
    Download

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