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  1. #1
    Join Date
    Jul 2007
    Posts
    72

    Need an assist on chamfers...

    I keep getting Alarm 55 (Missing move value in CHF/CNR)
    move distance is commanded less than the corner radius part..

    here is the section Im stuck on now

    ...
    #15=.03
    ...
    G96S300M4
    Z.2
    G0X[#100+.1]Z.1
    G71U[#1](DOC)
    G71P420Q430U.04W.005F.01
    N420 G0X[#119-[2*#15+.03]] Z.01
    G1X[#119]C-[#15]
    Z-[#127]F.007
    X[#120]C-[#16]
    Z-[#127+#128]
    #2=#120
    ...
    The prog. reads N420 then alarms out
    Initially I didn't have the +.03
    I have tried +.1 but still get alarm
    any advice/help would be appreciated
    I'm just a butcher masquerading as a machinist

  2. #2
    Join Date
    Feb 2008
    Posts
    267
    Make sure that you're in the correct plane (G18 I assume).
    After that, the move after the chamfer needs to be atleast as big as the chamfer itself and in the same direction.
    Too, are you sure that you need the "-" with the C value.
    Though I do not know what control you're using but base on your code, something like this...


    Code:
    G1 Z0
    X.5 C.03
    Z-.05(THIS MOVE NEEDS TO BE AT LEAST AS BIG AS THE C VALUE)
    X1.
    HTH
    Good luck
    Control the process, not the product!
    Machining is more science than art, master the science and the artistry will be evident.

  3. #3
    Join Date
    Feb 2006
    Posts
    1792
    Possibly your control does not allow C within G71.

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