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Thread: Newbie need help in pvc cutting

  1. #1
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    Default Newbie need help in pvc cutting

    New to cnc cutting and i keep on breaking my bits

    Need help on cutting pvc board
    Newbie need help in pvc cutting-wx_camera_1538371492983-jpg
    Bits im using 1/8" single flute Spiral Bit
    18mm pvc board

    Tired 3000/6000/9000/12000/15000/18000 rpm
    And 600mm per sec to 1000mm per sec

    Anyone can enlighten me about how much rpm and speed i need to use?

    Thanks

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  2. #2
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    Default Re: Newbie need help in pvc cutting

    Hi,
    I think you are trying to cut too fast.

    With a small diameter tool you need to spin it fast. I think 18000 rpm is right.

    The surface speed:
    S (m/min) = PI x Diameter (m) x rpm
    =3.14 X 0.003 x 18000
    =169.6 m/min which sounds about right for plastic.

    The chipload:
    T (mm per tooth per rev)= 600 (mm/min) / rpm
    =0.033 mm per tooth per rev
    For small diameter tools, I use down to 0.4mm endmills I allow 1% of the diameter as chipload. With larger and stronger tools you might allow 2-3%.
    Lets do the calculation for a 2% chipload:

    T (mm)= 0.02 x Diameter (mm)
    = 0.02 x 3
    = 0.06 mm
    So your chipload is close to correct at a federate of 600mm/min. I think you are going to have to take two or three cuts to get through it,
    3mm tools are fairly weak. Either that or slow the feedrate down until you don't overload it, maybe 200-300mm/min.

    Craig



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