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holes are tapered

Discussion in 'CNC Mills/Routers' started by Jeremy R, Jun 15, 2016.

  1. Jeremy R

    Jeremy R New
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    I have an ox machine. No matter what machining operation I do for making holes in 10mm PVC , i get a tapered hole. The top part of the hole is about 0.15mm larger than the bottom part.
    I have used a few different feeds but no change and have checked that the bit itself is not tapered.

    Any ideas?
     
  2. Florian Bauereisen

    Florian Bauereisen Well-Known
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    Flex in the z axis?
     
  3. Rick 2.0

    Rick 2.0 OpenBuilds Team
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  4. Jeremy R

    Jeremy R New
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    There is no melting. It is producing nice chips. I'll try reduce any flex in z axis.
     
  5. Jeremy R

    Jeremy R New
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    It was a deflection issue. I was cutting the PVC with a 1.5mm depth of cut. As a test, I changed the depth of cut to 0.1mm. There was basically no tapering! The hole was still undersized because I previously oversized the tool diameter in CAM. Once I adjust this back down to the right diameter, I should be ok I reckon.
     
    GrayUK likes this.
  6. GrayUK

    GrayUK Openbuilds Team Elder
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    Thanks for letting us know. Finding the cure for a problem is of great value to all who read this Forum. :thumbsup:
    Now lots of people know how to sort that problem out. :)
    Many Thanks.
     
    Jeremy R likes this.

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