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IndustryArena Forum > Manufacturing Processes > Milling > Z-differences between machined surfaces of equal height in model
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  1. #1
    Join Date
    Feb 2019
    Posts
    2

    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?
    Attached Thumbnails Attached Thumbnails IMG_0278 (kopia).jpg  

  2. #2
    Join Date
    Feb 2019
    Posts
    2

    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 IMG_0278 (kopia 2).jpg   IMG_0281.jpg   IMG_0281 copy.jpg  

  3. #3
    Join Date
    Jun 2013
    Posts
    443

    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
    Join Date
    Jun 2015
    Posts
    4131

    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
    Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg

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