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G-Code Help

Discussion in 'CAM' started by Synths, Nov 15, 2016.

  1. Synths

    Synths Well-Known
    Builder

    Joined:
    Aug 26, 2016
    Messages:
    24
    Likes Received:
    5
    Hi everyone,

    I had some trouble trying to engrave my name on my new C-Beam, please see attached.

    I don't yet understand G-Code and would appreciate any help rectifying the gouging that happened at the start of my code. I am using a V-bit at speed 6 on a makita. I used fusion 360 with GRBL post processing and I believe I have Grbl 0.9j (flashed on a Grbl AOI from 3dtek.xyz).

    Any input is greatly appreciated.
    Here's the code:

    Code:
    %
    (0005)
    (Extruded Rob trace v4)
    (T1  D=3 CR=0 - ZMIN=0 - flat end mill)
    G90 G94
    G17
    G21
    G28 G91 Z0
    G90
    
    (Trace2)
    M9
    T1 M6
    S18000 M3
    G54
    M9
    G0 X25.01 Y55.283
    Z10
    Z5
    G1 Z0 F720
    Y26.65
    X28.799
    Y39.365
    X33.282
    X33.458
    X33.547 Y39.364
    X33.635 Y39.363
    X33.723 Y39.362
    X33.812 Y39.361
    X33.9 Y39.359
    X33.988 Y39.356
    X34.076 Y39.353
    X34.164 Y39.349
    X34.252 Y39.345
    X34.34 Y39.339
    X34.428 Y39.333
    X34.515 Y39.325
    X34.603 Y39.317
    X34.691 Y39.307
    X34.778 Y39.298
    X34.866 Y39.287
    X34.953 Y39.276
    X35.041 Y39.264
    X35.216 Y39.24
    X35.303 Y39.228
    X35.379 Y39.205
    X35.531 Y39.16
    X35.606 Y39.136
    X35.682 Y39.112
    X35.757 Y39.088
    X35.832 Y39.062
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    X35.98 Y39.009
    X36.054 Y38.98
    X36.127 Y38.951
    X36.199 Y38.919
    X36.271 Y38.887
    X36.342 Y38.853
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    X36.482 Y38.782
    X36.552 Y38.744
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    X36.69 Y38.667
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    X36.827 Y38.588
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    X37.211 Y38.327
    X37.301 Y38.257
    X37.39 Y38.186
    X37.478 Y38.115
    X37.566 Y38.043
    X37.653 Y37.97
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    X37.823 Y37.82
    X37.906 Y37.744
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    X38.147 Y37.505
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    X25.01
    Z5
    G0 X28.799 Y52.119
    G1 Z0 F720
    X37.862
    X38.071 Y52.114
    X38.28 Y52.109
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    X38.697 Y52.094
    X38.905 Y52.083
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    Z5
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    Z5
    G0 X75.616 Y36.671
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    Y26.65
    X78.877
    Y29.248
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    Y55.283
    X75.616
    Y36.671
    Z5
    G0 X82.118 Y44.345
    G1 Z0 F720
    X82.282 Y44.434
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    X81.073 Y43.523
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    X81.358 Y43.785
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    X81.959 Y44.247
    X82.118 Y44.345
    Z5
    G0 Z10
    M9
    G28 G91 Z0
    G28 X0 Y0
    M30
    %
    
     

    Attached Files:

  2. Synths

    Synths Well-Known
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    This is the beginning of my analysis. I don't see anything wrong.

    Code:
    %
    (0005)
    (Extruded Rob trace v4)
    (T1  D=3 CR=0 - ZMIN=0 - flat end mill)
    G90 G94 ; Set to Absolute Positioning,  Feed Rate Mode
    G17 ; Plane Selection XY
    G21 ; Set Units to Millimeters
    G28 G91 Z0 ; Move to origin, Set to Relative Positioning, zero Z axis
    G90 ; Set to Absolute Positioning,
    
    (Trace2)
    M9 ; Coolant Off
    T1 M6 ; Select tool
    S18000 M3 ; Speed 18000
    G54 ;  Coordinate System Select
    M9 ; Collant off
    G0 X25.01 Y55.283 ;  Rapid linear Move
    Z10 ; Z up 10mm
    Z5 ; Z Down 5mm
    G1 Z0 F720 ; Linear Move Z down 5 mm 
     
  3. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder

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    the problem was discussed on this site just the other day (-:
    your post processor is not raising Z to the safe height before all motion.
    I will add comments to the code below to explain what is happening


    %
    (0005)
    (Extruded Rob trace v4)
    (T1 D=3 CR=0 - ZMIN=0 - flat end mill)
    G90 G94
    G17
    G21
    G28 G91 Z0 ; move to G28 preset position, but force Z to level 0
    problem is that Z=0 is the cutting depth in your case

    G90

    (Trace2)
    M9
    T1 M6
    S18000 M3
    G54
    M9
    G0 X25.01 Y55.283 ; go to start of cut
    Z10 ; raise Z
    Z5 ; drop Z again, I think you set safe height to 5mm?
    G1 Z0 F720 ; plunge into the work , down to Z=0
    Y26.65 ; start cutting the R
    X28.799
    Y39.365
    X33.282
    X33.458
    X33.547 Y39.364
    X33.635 Y39.363
    X33.723 Y39.362
    X33.812 Y39.361
    X33.9 Y39.359

    then you will see, between letters is raises to safe height correctly

    X37.952 Y55.281
    X37.705 Y55.283
    X25.01
    Z5 ; raise to safe height
    G0 X28.799 Y52.119 ; go to new letter
    G1 Z0 F720 ; plunge to start cut
    X37.862
    X38.071 Y52.114
    X38.28 Y52.109

    then at the end it does the G28 ... Z0 thing again and cuts when it should not.

    So I did some googling and found these 2 pages
    Safe Z axis move - Autodesk Community
    Solved: Tool Starting Position - Autodesk Community

    They tell me that Fusion is expecting the machine to conform to industry standard that says that machine Z0 is at the top of the Z travel. From this I assume that your machine does not have home switches, or if it does, the Z home is not at the top of travel.

    What to do?
    1. Switch the machine off
    2. manually wind Z to the top of travel (and X to the right and Y to the back)
    3. switch the machine on
    4. set up G28 to a safe place away from the work
    5. now set up your part using the G54 work co-ordinate system (this is what the 'set axis 0' buttons in UGS and other GRBL GUI's do)
    Now your fusion code should work fine because your machine is set up correctly.
    Once you have done this you can do
    G53 Z0
    G53 X0 Y0
    before you turn the machine off which will park it in the correct position so that when you turn it on the machine home is correct. In some GUI's you can set this as a macro for easy one click usage.

    If you don't know what a work co-ordinate system is then read this
    LinuxCNC Documentation Wiki: CoordinateSystems

    I would also suggest changing the 0,0,0 point in Fusion to be the top of the workpiece.


    Let us know how it goes...
     
    Synths and Joe Santarsiero like this.
  4. Synths

    Synths Well-Known
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    Thank you for your reply!

    I don't have limit switches and have been clueless about the coordinate system thus far. I use chilipeppr's 'zero out' button when I manually move the axis' to the work piece. It will take me some time to digest your wonderfully thorough reply. Thanks again.

    Cheers,
    Rob
     
    David the swarfer likes this.
  5. Synths

    Synths Well-Known
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    I have read through your reply and the links a couple of times now. I'm still unsure how to set G28 in step 4 of your solution.
     
  6. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder

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    Can be just o,o,o machine coordinates, so long as going there at the beginning of the program, and at the end, will not harm anything.
     
  7. Synths

    Synths Well-Known
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    Okay, I've read these:
    But I think the penny dropped after reading this: http://www.diymachining.com/how-to-run-a-gshield-cnc-machine-without-limit-switches/

    So I'm going to try this:
    1. Jog Z to the top, X to the right and Y to the back.
    2. Reset GRBL
    3. Jog closer to the part but well away from it
    4. type G28.1
    5. Jog to 'part zero'/work zero
    6. Hit 'Zero out' in chilipeppr or type G10 P1 L20 (or G92 X0 Y0 Z0) in the serial prompt
    7. Run the job
    Does that sound about right?
    Do I need to enable homing in my grbl settings?
     
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  8. Synths

    Synths Well-Known
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    Success!
    Thanks David
     

    Attached Files:

    David the swarfer likes this.
  9. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder

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    Synths likes this.
  10. Synths

    Synths Well-Known
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    That seems to be an issue, chilipeppr uses G92 X0 Y0 Z0 as the 'zero out' button I keep using. I'll switch to UGS.

    I'm not sure what I have done this time! Attached is my latest failure, Fusion 360 file and here's the G-Code:

    Code:
    %
    (1010)
    (big keychain)
    (T1  D=5 CR=0 - ZMIN=-9 - flat end mill)
    G90 G94
    G17
    G21
    G28 G91 Z0
    G90
    
    (2D Pocket1)
    M9
    T1 M6
    S18000 M3
    G54
    M9
    G0 X25.842 Y35.532
    Z15
    Z5
    G1 Z3 F960
    G2 X25.817 Y35.559 Z2.812 I7.802 J7.325
    X25.747 Y35.635 Z2.652 I7.827 J7.298
    X25.642 Y35.751 Z2.543 I7.897 J7.222
    X25.52 Y35.891 Z2.5 I8.002 J7.106
    X33.613 Y53.558 Z1.649 I8.124 J6.966
    X41.15 Y35.229 Z0.765 I0.031 J-10.702
    G1 X43.494 Y30.821 Z0.59
    X47.712 Y28.667 Z0.425
    X47.858 Y28.82 Z0.417
    X45.354 Y33.839 Z0.222
    G2 X45.355 Y36.52 Z0.125 I2.684 J1.339
    G1 X46.089 Y37.987 Z0.067
    X46.28 Y38.857 Z0.036
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    G0 Z15
    
    (Circular1)
    M9
    X25.393 Y13.652
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    Z1
    G1 Z-0.5 F960
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    X25.393
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    G1 Z-1.5 F960
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    G19 G3 Y13.652 Z-1.5 K0.5
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    X25.393
    Z-1
    G1 Z-2.5 F960
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    G17 G3 X25.893 Y12.402 I0.5
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    X25.393
    Z-2
    G1 Z-3.5 F960
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    G0 Z5
    X25.393
    Z-3
    G1 Z-4.5 F960
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    X25.393
    Z-4
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    X25.393
    Z-5
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    X25.393
    Z-6
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    G0 Z15
    G17
    
    (2D Adaptive1)
    M9
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    G0 Z15
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    G28 G91 Z0
    G28 X0 Y0
    M30
    %
    
     

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  11. David the swarfer

    David the swarfer OpenBuilds Team
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    There is nothing wrong with the code that I can see.
    It still depends on both G54 and G28 being set correctly.

    Note that when it starts the outline cut it expects to be outside the stock, which it appears to have been, ie off the edge on the near side. This is important because it rapids down to within the top of the stock.

    From the burning I'd say that the chips got caught in the bit and once it was full it started to produce a lot of friction. Reduce the depth of cut and/or number of teeth on the cutter. Those chips have to have somewhere to go and they MUST go there. You also do not want to re-cut any chips so make sure you blow them away or suck them up.

    From the wandering direction I'd say that the X axis lost steps due to the bit forcing itself to the left.

    Is it an upcut bit? How many teeth? How fast is it turning? Is the cutter designed for wood?
    It all makes a difference. (-:
     
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  12. Synths

    Synths Well-Known
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    Thanks for your insights.
    I guess I didn't set G54 and G28 correctly and I used too few passes. The bit was a 4 flute HSS end mill, 5mm diameter with a 6 mm shank. Not sure about upcut or if it's designed for wood because its a cheap aliexpress bit. The spindle speed was set to 6 on the Makita, which is 18000 or greater (if I recall correctly). I'm quite new to all this but I understand it's a poor choice of cutter.
     
  13. Synths

    Synths Well-Known
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    *18000 rpm
     
  14. Synths

    Synths Well-Known
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    And the stock was 9mm scrap ply.
     
  15. David the swarfer

    David the swarfer OpenBuilds Team
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    In wood and aluminum you want fewer flutes to give the chips space to escape.
    Especially for small diameter cutters (less than .5 inch)

    Google for how to calculate feed rate (also look in the Resources section on this site), each flute can be cutting about 3 to 5 thou per rev (in wood).
    Too little and it makes powder instead of chips.
    Too much and it will get stuck.

    Always try to use the correct calculated feed speed, then adjust depth of cut to keep your machine happy.
    A great big industrial machine might be able to cut 2 inches deep, but the feed speed and RPM are still calculated. A light DIY machine made from scraps and drawer slides might only be able to cut 1/16" deep, the feedrate will not change that much at all so better to use the correct rate and experimentally increase the depth of cut until the machine is unhappy, then back off about 20%.
    Yes, there is such a thing as feeding too slowly so 'babying' the rate of cut is not useful.
     
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  16. David the swarfer

    David the swarfer OpenBuilds Team
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    Another solution is to use a different post processor, like this one designed for GRBL
    GitHub - Strooom/GRBL-Post-Processor: Start

    It does not use the G28 code at all, instead using G53 which means that home must be set correctly
     
  17. Synths

    Synths Well-Known
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    You were right about my bit, speeds and feeds. I setup just like in my post (G-Code Help) and cut a 1.5x scaled version of Kyo's keyring. Thanks again.
     

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