Z height issue - CAM/Post Processor/Controller?


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Thread: Z height issue - CAM/Post Processor/Controller?

  1. #1
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    Default Z height issue - CAM/Post Processor/Controller?

    New boy alert! Got a weird issue I wanted to run past folk please.

    Just ran a prototype part, first op (adaptive clearing went well), 2nd op was a 0.1mm face op... which actually came in an hammered a approx 3mm depth of cut, scrapping the part and nearly giving me a heart attack.

    I think the G code is ok which means fusion and the post processor was fine, but as I am rubbish at reading g code I wanted to get advice from more experienced heads so I can rule out Fusion an dthe post processor

    z0 was stock top, which was 0.1 from model top. I'm running a 10mm endmill into alu. This is the exerpt of the face op

    (FACE2)
    N2559 G0 X86.5 Y3.675
    N2560 Z15
    N2561 Z5
    N2562 G1 Z0.9 F400
    N2563 G18 G3 X85.5 Z-0.1 I-1
    N2564 G1 X80
    N2565 X0
    N2566 G3 X-1 Z0.9 K1
    N2567 G0 Z5
    N2568 G1 X86.5 Y12.255 F4000
    N2569 Z0.9 F400
    N2570 G3 X85.5 Z-0.1 I-1
    N2571 G1 X80
    N2572 X0
    N2573 G3 X-1 Z0.9 K1
    N2574 G0 Z5
    N2575 G1 X86.5 Y20.835 F4000
    N2576 Z0.9 F400
    N2577 G3 X85.5 Z-0.1 I-1
    N2578 G1 X80
    N2579 X0
    N2580 G3 X-1 Z0.9 K1
    N2581 G0 Z5
    N2582 G1 X86.5 Y29.415 F4000
    N2583 Z0.9 F400
    N2584 G3 X85.5 Z-0.1 I-1
    N2585 G1 X80
    N2586 X0
    N2587 G3 X-1 Z0.9 K1
    N2588 G0 Z5
    N2589 G1 X86.5 Y37.995 F4000
    N2590 Z0.9 F400
    N2591 G3 X85.5 Z-0.1 I-1
    N2592 G1 X80
    N2593 X0
    N2594 G3 X-1 Z0.9 K1
    N2595 G0 Z5
    N2596 G1 X86.5 Y46.575 F4000
    N2597 Z0.9 F400
    N2598 G3 X85.5 Z-0.1 I-1
    N2599 G1 X80
    N2600 X0
    N2601 G3 X-1 Z0.9 K1
    N2602 G0 Z5
    N2603 G1 X86.5 Y55.155 F4000
    N2604 Z0.9 F400
    N2605 G3 X85.5 Z-0.1 I-1
    N2606 G1 X80
    N2607 X0
    N2608 G3 X-1 Z0.9 K1
    N2609 G0 Z15
    N2610 G17

    I'll add a photo of the physical part.

    Would welcome your diagnosis as my suspicion is currently on the controller/machine.

    Thanks folks!

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    Last edited by Dangle_kt; 02-26-2017 at 04:40 PM.


  2. #2
    Community Moderator Jim Dawson's Avatar
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    Default Re: Z height issue - CAM/Post Processor/Controller?

    It looks like the G code is OK, at least nothing jumps out at me. Could the tool bit have pulled out of the collet? Or maybe the Z axis drifted down?



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    Default Re: Z height issue - CAM/Post Processor/Controller?

    Thanks Jim - I will check the tool pullout, that sounds very likely as the adaptive it was doing before hand was pretty heavy for my little mill, and the floor of it was progressivly getting deeper on every pass which you can just make out on the photo.

    I'll check tonight.

    Cheers!



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    Default Re: Z height issue - CAM/Post Processor/Controller?

    You were right - the tool had been pulled out a little. I will clean them up, and torque properly in future.



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    Default Re: Z height issue - CAM/Post Processor/Controller?

    Quote Originally Posted by Jim Dawson View Post
    It looks like the G code is OK, at least nothing jumps out at me. Could the tool bit have pulled out of the collet? Or maybe the Z axis drifted down?
    The G code does not look good at all, the Z axes moves should be on there own line, why is he using a G18
    For what he milling it is a G17 plane

    The program is incorrect for what he was wanting to cut

    G18 G3X86.5Z-0.1I-1

    Mactec54


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    Default Re: Z height issue - CAM/Post Processor/Controller?

    That is the lead in lead out defaulted in HSMworks (Fusion 360's integrated CAM program). Works just fine.


    """""""The G code does not look good at all, the Z axes moves should be on there own line, why is he using a G18
    For what he milling it is a G17 plane

    The program is incorrect for what he was wanting to cut

    G18 G3X86.5Z-0.1I-1""""""



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Z height issue - CAM/Post Processor/Controller?

Z height issue - CAM/Post Processor/Controller?