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  1. #1
    Registered
    Join Date
    Nov 2017
    Posts
    0

    Odd Inaccuracies

    I am using cambam to draw and create code to cut out plywood parts for cabinet boxes. Very simple drawings. For some reason I'm getting some odd inaccuracies.

    For example, I have one program that just cuts out three rectangles. Each with a .75" dado along on edge. The distance to the start of the dado was correct but the last 1/16" was gone leaving both the rectangle and dado undersized. On the latest program the dados were all undersized, and in two spots the start and stop points of a profile cutout were 1/16" off.

    The dados being undersized happens both when using a profile and pocket. And the following is the generated gcode for the lastest program.

    Any thoughts?

    ( Made using CamBam - CamBam CNC Software )
    ( base corner 2ft by 1ft 11/6/2017 10:15:26 AM )
    ( T0 : 0.25 )
    G20 G90 G91.1 G64 G40
    G0 Z1.25
    ( T0 : 0.25 )
    T0 M6
    ( Drill1 )
    G17
    M3 S1000
    G0 X13.0625 Y13.125
    G98
    G81 X13.0625 Y13.125 Z0.25 R1.25 F40.0
    G81 Y14.375 Z0.25
    G81 Y15.625 Z0.25
    G81 Y16.875 Z0.25
    G81 Y18.125 Z0.25
    G81 Y19.375 Z0.25
    G81 Y20.625 Z0.25
    G81 Y21.875 Z0.25
    G81 Y23.125 Z0.25
    G81 X11.0 Z0.25
    G81 Y21.875 Z0.25
    G81 Y20.625 Z0.25
    G81 Y19.375 Z0.25
    G81 Y18.125 Z0.25
    G81 Y16.875 Z0.25
    G81 Y15.625 Z0.25
    G81 Y14.375 Z0.25
    G81 Y13.125 Z0.25
    G81 Y11.875 Z0.25
    G81 X13.0625 Z0.25
    G81 X2.25 Z0.25
    G81 Y13.125 Z0.25
    G81 Y14.375 Z0.25
    G81 Y15.625 Z0.25
    G81 Y16.875 Z0.25
    G81 Y18.125 Z0.25
    G81 Y19.375 Z0.25
    G81 Y20.625 Z0.25
    G81 Y21.875 Z0.25
    G81 Y23.125 Z0.25
    G81 X33.6875 Z0.25
    G81 Y21.875 Z0.25
    G81 Y20.625 Z0.25
    G81 Y19.375 Z0.25
    G81 Y18.125 Z0.25
    G81 Y16.875 Z0.25
    G81 Y15.625 Z0.25
    G81 Y14.375 Z0.25
    G81 Y13.125 Z0.25
    G81 Y11.875 Z0.25
    G80
    ( Pocket1 )
    S1000
    G0 Z1.25
    G0 X0.625 Y4.8125
    G0 Z0.8125
    G1 F10.0 Z0.625
    G1 F250.0 X35.6875
    G1 Y5.3125
    G1 X0.4375(the difference in y's is .5 add on the .125 for either half of the bit and that should equal .75 but it doesn't cut that way.
    G1 Y4.8125

    G1 X0.625
    G1 F10.0 Y4.9375
    G1 F250.0 X35.5625
    G1 Y5.1875
    G1 X0.5625
    G1 Y4.9375
    G1 X0.625
    G0 Z1.25
    G0 X0.6875 Y5.0625
    G0 Z0.8125
    G1 F10.0 Z0.625
    G1 F250.0 X35.4375
    G1 Y35.0
    G1 X34.9375
    G1 Y4.8125
    G1 X35.4375
    G1 Y5.0625
    G1 F10.0 X35.3125
    G1 F250.0 Y34.875
    G1 X35.0625
    G1 Y4.9375
    G1 X35.3125
    G1 Y5.0625
    G1 F10.0 X35.1875
    G1 F250.0 Y34.75
    G0 Z1.25
    G0 X0.875
    G0 Z0.8125
    G1 F10.0 Z0.625
    G1 F250.0 Y5.0625
    G1 F10.0 Y4.9375
    G1 F250.0 X1.0
    G1 Y34.875
    G1 X0.75
    G1 Y4.9375
    G1 X0.875
    G1 F10.0 Y4.8125
    G1 F250.0 X1.125
    G1 Y35.0
    G1 X0.625
    G1 Y4.8125
    G1 X0.875
    G0 Z1.25
    G0 X8.5625
    G0 Z0.8125
    G1 F10.0 Z0.625
    G1 F250.0 Y0.625
    G1 X9.0625
    G1 Y5.1965
    G1 X8.5625
    G1 Y4.8125
    G1 F10.0 X8.6875
    G1 F250.0 Y0.75
    G1 X8.9375
    G1 Y5.0715
    G1 X8.6875
    G1 Y4.8125
    G0 Z1.25
    G0 X8.8125 Y0.875
    G0 Z0.8125
    G1 F10.0 Z0.625
    G1 F250.0 Y4.9465
    G1 Y0.875
    G0 Z1.25
    G0 X15.0
    G0 Z0.8125
    G1 F10.0 Z0.625
    G1 F250.0 Y0.625
    G1 X15.5
    G1 Y5.1965
    G1 X15.0
    G1 Y0.875
    G1 F10.0 X15.125
    G1 F250.0 Y0.75
    G1 X15.375
    G1 Y5.0715
    G1 X15.125
    G1 Y0.875
    G1 F10.0 X15.25
    G1 F250.0 Y4.9465
    ( Pocket2 )
    S1000
    G0 Z1.25
    G0 X12.0 Y3.875
    G0 Z0.8125
    G1 F10.0 Z0.25
    G1 F90.0 Y34.875
    G1 X12.0625
    G1 Y3.875
    G1 X12.0
    G1 F10.0 X11.875
    G1 F90.0 Y35.0
    G1 X12.1875
    G1 Y3.75
    G1 X11.875
    G1 Y3.875
    ( Profile1 )
    S1000
    G0 Z1.25
    G0 X14.875 Y0.375
    G0 Z0.8125
    G1 F30.0 Z0.01
    G1 F75.0 X35.5625
    G3 X35.6875 Y0.5 I0.0 J0.125
    G1 Y35.0
    G3 X35.5625 Y35.125 I-0.125 J0.0
    G1 X12.1875
    G3 X12.0625 Y35.0 I0.0 J-0.125
    G1 Y4.0
    G3 X12.1875 Y3.875 I0.125 J0.0
    G1 X14.75
    G1 Y0.5
    G3 X14.875 Y0.375 I0.125 J0.0
    G0 Z1.25
    G0 X11.9547 Y3.9037
    G0 Z0.8125
    G1 F30.0 Z0.01
    G3 F75.0 X12.0 Y4.0 I-0.0797 J0.0963
    G1 Y35.0
    G3 X11.875 Y35.125 I-0.125 J0.0
    G1 X0.5
    G3 X0.375 Y35.0 I0.0 J-0.125
    G1 Y0.5
    G3 X0.5 Y0.375 I0.125 J0.0
    G1 X9.1875
    G3 X9.3125 Y0.5 I0.0 J0.125
    G1 Y3.875
    G1 X11.875
    G3 X11.9547 Y3.9037 I0.0 J0.125
    G0 Z1.25
    G0 X13.9919 Y35.3128
    G0 Z0.8125
    G1 F30.0 Z0.01
    G3 F75.0 X14.0 Y35.3125 I0.0081 J0.1247
    G1 X25.375
    G1 X48.0
    G3 X48.125 Y35.4375 I0.0 J0.125
    G1 Y57.4375
    G1 Y69.4375
    G3 X48.0 Y69.5625 I-0.125 J0.0
    G1 X25.375
    G3 X25.25 Y69.4375 I0.0 J-0.125
    G1 Y57.4375
    G1 Y46.1875
    G1 X14.0
    G3 X13.875 Y46.0625 I0.0 J-0.125
    G1 Y35.4375
    G3 X13.9919 Y35.3128 I0.125 J0.0
    G0 Z1.25
    G0 Y46.9554 (this is where the profile cuts don't match on either side of the cut. the code seems to say they should)
    G0 Z0.8125
    G1 F30.0 Z0.01
    G1 F75.0 X22.9053
    G3 X23.0303 Y47.0804 I0.0 J0.125
    G1 Y58.8594
    G1 Y70.1094
    G1 X34.0625
    G3 X34.1875 Y70.2344 I0.0 J0.125
    G1 Y80.6429
    G3 X34.0625 Y80.7679 I-0.125 J0.0
    G1 X0.5
    G3 X0.375 Y80.6429 I0.0 J-0.125
    G1 Y47.0804
    G3 X0.5 Y46.9554 I0.125 J0.0
    G1 X13.9919
    G0 Z1.25
    M5
    M30

  2. #2
    Registered
    Join Date
    Dec 2008
    Posts
    292

    Re: Odd Inaccuracies

    You would be much more likely to get a response for your issue by posting on the CamBam forum CamBam - Index You will need to register on the forum to be able to post the question. Also, posting the gcode doesn't help. You will need to attach the CamBam (.cb) file for the group to be able to determine what the issue is.

    Don

  3. #3
    Registered
    Join Date
    Nov 2008
    Posts
    258

    Re: Odd Inaccuracies

    Its probably the machine. if its still a problem describe how the machine is constructed. I'm sure someone here can advise.

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