Z-differences between machined surfaces of equal height in model

Results 1 to 4 of 4

Thread: Z-differences between machined surfaces of equal height in model

  1. #1
    Member melfio's Avatar
    Join Date
    Feb 2019
    Posts
    2
    Downloads
    0
    Uploads
    0

    Default Z-differences between machined surfaces of equal height in model

    I'm machining in plastic stock and a 10mm ball nose (0,39"). I have run both a "parallel" program and a "morphed spiral" program on the same model, and I get similar discrepancies between the model and the machined parts from both programs.

    Mainly: The middle area marked in the pictures is lower than the two ends.

    Any ideas on what might cause this?

    Similar Threads:
    Attached Thumbnails Attached Thumbnails Z-differences between machined surfaces of equal height in model-sk-rmavbild-2020-10-02-kl-16-a   Z-differences between machined surfaces of equal height in model-img_0278-kopia-jpg   Z-differences between machined surfaces of equal height in model-img_0278-jpg  
    Last edited by melfio; 10-02-2020 at 12:52 PM. Reason: better description now


  2. #2
    Member melfio's Avatar
    Join Date
    Feb 2019
    Posts
    2
    Downloads
    0
    Uploads
    0

    Default Re: Z-differences between machined surfaces of equal height in model

    More details; the parts marked U are raised and the parts marked N are lower. The zoom photos are of the part made with spiral passes.

    Attached Thumbnails Attached Thumbnails Z-differences between machined surfaces of equal height in model-img_0278-kopia-2-jpg   Z-differences between machined surfaces of equal height in model-img_0281-jpg   Z-differences between machined surfaces of equal height in model-img_0281-copy-jpg  


  3. #3
    Member
    Join Date
    Jun 2013
    Posts
    198
    Downloads
    0
    Uploads
    0

    Default Re: Z-differences between machined surfaces of equal height in model

    Strange fault. How are you holding the pieces down when cutting them? No chance they are bouncing very slightly?

    Sometimes I have solved that kind of issue by doing the same op but in climb cut (or the opposite) afterwards.

    Sent from my SM-N970F using Tapatalk



  4. #4
    Member deadlykitten's Avatar
    Join Date
    Jun 2015
    Location
    Antarctica
    Posts
    3248
    Downloads
    0
    Uploads
    0

    Default Re: Z-differences between machined surfaces of equal height in model

    hi face and dial the part before begining, then run a few prefinishes and dial the part between them

    also, after removing the part from machining fixture, clamp it in another manner, with minimal holding force, and dial it again

    like this, you should find if deformation occurs during machining, or after removing it from the fixture

    it may be required to change a bit your model, in order to have a flat surface, that you may use to dial on it; is possible to entirely avoid these flat surfaces, and dial directly on a 3d complex shape, but this procedure is a bit more time consuming, and it's precision may be too high for finding the flex source; normally, i use it for surface prelevation of complex shapes, so ....

    kindly

    the human body has enough iron to make a nail ... i can also make the hammer :) i mean a plastic hammer


Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


About CNCzone.com

    We are the largest and most active discussion forum for manufacturing industry. The site is 100% free to join and use, so join today!

Follow us on


Our Brands

Z-differences between machined surfaces of equal height in model

Z-differences between machined surfaces of equal height in model

Z-differences between machined surfaces of equal height in model