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Cbeam not cutting smooth when transversing x and y axis

Discussion in 'CNC Mills/Routers' started by phoenix fab, Aug 12, 2019.

  1. phoenix fab

    phoenix fab Well-Known
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    so this is a new build I’m trying to get running smoothly.
    1500x3000 machine.
    Files created in vcarve pro.
    The issue I’m having is when cutting hpde which is all I’m Using it for currently when it starts the angles section of the design it doesn’t cut smoothly more like a saw blade finish. I’ve adjusted the feeds and speeds from 30 ipm to 150 ipm no difference. I’ve used the smooth vectors in vcarve for circular arcs, bezier etc. no difference.
    I’m frustrated with this issue.
    I’m attaching some pics of the cuts as well.

    Hopefully somebody can help me out.

    Thanks
     

    Attached Files:

  2. Kevon Ritter

    Kevon Ritter Master
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    It looks like you are trying to cut in a single pass. This has nothing to do with software. Without knowing anything about the machine, no one will be able to provide meaningful advice.
     
    Alex Chambers likes this.
  3. Alex Chambers

    Alex Chambers Master
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    Hi @phoenix fab, we need a bit more information to help with this. As a start could you please post your G code file and tell us what you are using as a spindle/router and what speed are you using. That is a large machine, did you strengthen any of the axes to increase rigidity?
    Alex.
     
  4. phoenix fab

    phoenix fab Well-Known
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    Hey Alex
    im using the small makita router ive varied the speed from 3-6 on the dial as i looked at the shapoko speed and feed chart i initilly started with 3 passes then changed it to.125 per pass and even down to .063 per pass.
    I have not reinforced the frame at this point. i originally bought the 1500x1500 belt drive kit from spark concepts and then bought parts needed to extend it from openbuilds so the frame has 4- 3000mm i think 2080 beams that i have 1/2 finish plywood screwed to with 3/4" mdf for the spoil board on top of that.
    heres the g-code created in vcarve pro.

    thank you for your time


    T1
    G17
    G21
    G90
    G0Z20.320
    G0X0.000Y0.000
    S18000M3
    G0X80.647Y596.699Z4.572
    G0Z3.810
    G1Z-3.175F1016.0
    G1X156.865F2032.0
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    G1X124.396Y377.953
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    G1X125.044Y377.821
    G1X124.396Y377.953
    G1X123.754Y378.111
    G1X123.117Y378.293
    G1X122.487Y378.499
    G1X121.863Y378.727
    G1X121.247Y378.978
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    G1X156.865F2032.0
    G1Y377.624
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    G1X123.117Y378.293
    G1X122.487Y378.499
    G1X121.863Y378.727
    G1X121.247Y378.978
    G1X120.640Y379.250
    G1X120.040Y379.543
    G1X119.450Y379.855
    G1X118.870Y380.187
    G1X118.301Y380.539
    G1X117.742Y380.908
    G1X117.195Y381.296
    G1X116.661Y381.702
    G1X116.140Y382.125
    G1X115.634Y382.565
    G1X115.142Y383.021
    G1X114.666Y383.494
    G1X114.206Y383.984
    G1X113.765Y384.489
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    G1X112.938Y385.547
    G1X112.555Y386.099
    G1X112.195Y386.667
    G1X111.858Y387.250
    G1X111.545Y387.848
    G1X111.259Y388.460
    G1X111.000Y389.087
    G1X110.772Y389.729
    G1X110.546Y390.477
    G1X80.880Y553.952
    G1X80.647Y596.699
    G1Z-12.700F1016.0
    G1X156.865F2032.0
    G1Y377.624
    G1X126.469
    G1X125.696Y377.716
    G1X125.044Y377.821
    G1X124.396Y377.953
    G1X123.754Y378.111
    G1X123.117Y378.293
    G1X122.487Y378.499
    G1X121.863Y378.727
    G1X121.247Y378.978
    G1X120.640Y379.250
    G1X120.040Y379.543
    G1X119.450Y379.855
    G1X118.870Y380.187
    G1X118.301Y380.539
    G1X117.742Y380.908
    G1X117.195Y381.296
    G1X116.661Y381.702
    G1X116.140Y382.125
    G1X115.634Y382.565
    G1X115.142Y383.021
    G1X114.666Y383.494
    G1X114.206Y383.984
    G1X113.765Y384.489
    G1X113.342Y385.010
    G1X112.938Y385.547
    G1X112.555Y386.099
    G1X112.195Y386.667
    G1X111.858Y387.250
    G1X111.545Y387.848
    G1X111.259Y388.460
    G1X111.000Y389.087
    G1X110.772Y389.729
    G1X110.546Y390.477
    G1X80.880Y553.952
    G1X80.647Y596.699
    G0Z4.572
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    G1X73.154Y479.492
    G1X73.797Y479.335
    G1X74.433Y479.153
    G1X75.064Y478.947
    G1X75.687Y478.719
    G1X76.303Y478.469
    G1X76.912Y478.197
    G1X77.511Y477.905
    G1X78.102Y477.592
    G1X78.682Y477.260
    G1X79.253Y476.909
    G1X79.812Y476.540
    G1X80.359Y476.152
    G1X80.894Y475.747
    G1X81.415Y475.324
    G1X81.923Y474.884
    G1X82.415Y474.427
    G1X82.892Y473.954
    G1X83.351Y473.465
    G1X83.794Y472.959
    G1X84.217Y472.437
    G1X84.621Y471.900
    G1X85.003Y471.347
    G1X85.364Y470.778
    G1X85.701Y470.194
    G1X86.013Y469.595
    G1X86.298Y468.981
    G1X86.556Y468.352
    G1X86.783Y467.709
    G1X87.005Y466.964
    G1X116.670Y303.494
    G1X116.903Y260.747
    G1X40.685
    G1Y479.822
    G1Z-9.525F1016.0
    G1X71.081F2032.0
    G1X71.854Y479.730
    G1X72.506Y479.625
    G1X73.154Y479.492
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    G1X74.433Y479.153
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    G1X81.923Y474.884
    G1X82.415Y474.427
    G1X82.892Y473.954
    G1X83.351Y473.465
    G1X83.794Y472.959
    G1X84.217Y472.437
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    G1X85.003Y471.347
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    G1X85.701Y470.194
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    G1X87.005Y466.964
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    G1X40.685
    G1Y479.822
    G1Z-12.700F1016.0
    G1X71.081F2032.0
    G1X71.854Y479.730
    G1X72.506Y479.625
    G1X73.154Y479.492
    G1X73.797Y479.335
    G1X74.433Y479.153
    G1X75.064Y478.947
    G1X75.687Y478.719
    G1X76.303Y478.469
    G1X76.912Y478.197
    G1X77.511Y477.905
    G1X78.102Y477.592
    G1X78.682Y477.260
    G1X79.253Y476.909
    G1X79.812Y476.540
    G1X80.359Y476.152
    G1X80.894Y475.747
    G1X81.415Y475.324
    G1X81.923Y474.884
    G1X82.415Y474.427
    G1X82.892Y473.954
    G1X83.351Y473.465
    G1X83.794Y472.959
    G1X84.217Y472.437
    G1X84.621Y471.900
    G1X85.003Y471.347
    G1X85.364Y470.778
    G1X85.701Y470.194
    G1X86.013Y469.595
    G1X86.298Y468.981
    G1X86.556Y468.352
    G1X86.783Y467.709
    G1X87.005Y466.964
    G1X116.670Y303.494
    G1X116.903Y260.747
    G1X40.685
    G1Y479.822
    G0Z4.572
    M5
    G0Z20.320
    G0X0.000Y0.000
    M2
     
  5. Alex Chambers

    Alex Chambers Master
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    Hi @phoenix fab, I don't use V-carve, but I know it can output the G-code for arcs, and your G-code is all straight lines. What controller and control software are you using ad what post processor are you using with V-carve.
    It's late here (UK) so I'll have another look at this tomorrow and probably ask some more questions.
    Alex.
     
  6. Kevon Ritter

    Kevon Ritter Master
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    Pictures of the machine?
    What end mill?
     
  7. phoenix fab

    phoenix fab Well-Known
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    here's some pics of it while i was building it, this is all i have access to right now..
    the endmill is a 1/4" "0" flute up cut amana bit
     

    Attached Files:

  8. phoenix fab

    phoenix fab Well-Known
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    I’m using the Xpro 3 and the openbuilds control software. the p/p im using is the grbl mm gcode
     
    #8 phoenix fab, Aug 12, 2019
    Last edited: Aug 12, 2019
  9. AmirSigns

    AmirSigns Well-Known
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    Hi .
    Did You set the current in controller?
     

    Attached Files:

  10. Alex Chambers

    Alex Chambers Master
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    Hi @phoenix fab, in your earlier thread you said that you had side to side play on your machine - did you ever fix that? What was the cause of that?
    You said you were cutting hdpe. Is that solid or foam. If solid your depth of cut should be about 2mm (0.08"). A feed of 55"/min and setting 3 on your router.
    If you haven't fixed the problems with side play that's the most likely cause of the problem and we won't be able to diagnose any other problems.
    Alex.
     
  11. GrayUK

    GrayUK Openbuilds Team Elder
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    Did all the pieces, all over the job, have the same errors, or did they vary as the cuts got nearer to one side or the other? Or up and down the bed? :rolleyes:
     
  12. phoenix fab

    phoenix fab Well-Known
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    I believe the side play is fixed what I noticed was on the controller one of the lights for that motor was off so I restarted everything and it seemed to fix that.
    The hpde is king starboard it’s solid.

    I’ll give your recommendations a shot when I get to the shop this morning. Thank you.
     
  13. phoenix fab

    phoenix fab Well-Known
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    The same section on every piece I cut was the same. I ran a series of test cuts all at differ feed speeds different options in vcarve etc.
     
  14. phoenix fab

    phoenix fab Well-Known
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    Thanks I’ll take a look at the controller and be sure it’s configured as pictured. I’m pretty sure it is but I’ll double check.
     
  15. Alex Chambers

    Alex Chambers Master
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    The reason I asked earlier whether you had strengthened the frame is because of the length of your X and Y axes - flexing of the C beams is very likely to be an issue when they are under side loads from the cutter pressing against the material. Take very shallow cuts (say 1mm) and see if things improve.
    Alex.
     
  16. phoenix fab

    phoenix fab Well-Known
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    doesnt seem to improve the quality
    i ran it at 55 ipm .039" per pass
    55ipm .05" per pass
    55 ipm .08" per pass
    readjusted all the eccentrics and tightened the belts
    im thinking it might be to much flex in the y axis cbeam
     
  17. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
    Staff Member Moderator Resident Builder Project Maker Builder

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    3m spans will definately have issues with rigidity...
     
  18. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Did you do a finishing pass?
     
  19. Alex Chambers

    Alex Chambers Master
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    I think you are probably right. There are ways to strengthen C-beam and if you search the forum you will probably find a few. On my phone at the moment so not so easy to search for you. Will post some links if I find them later.
    Alex.
     
  20. phoenix fab

    phoenix fab Well-Known
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  21. phoenix fab

    phoenix fab Well-Known
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    Not on this last series of test cuts but prior to that I did try a couple with a finishing pass.
    It didn’t seem to help.
     
  22. Alex Chambers

    Alex Chambers Master
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    phoenix fab likes this.
  23. phoenix fab

    phoenix fab Well-Known
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    Thank you I’ll read up on this.
    If I can’t get the vibration/flex stopped I may be forced to move to a 15/20 mm linear rail with gear reduction like an avid cnc style and bolt cross bars in like they do to stiffen the frame
     
    Alex Chambers likes this.
  24. Alex Chambers

    Alex Chambers Master
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    That's another approach, but probably not cheap.
    Alex.
     
  25. phoenix fab

    phoenix fab Well-Known
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    yeah def not cheap.. im hoping to figure something else out before having to go that route
     
  26. Kevon Ritter

    Kevon Ritter Master
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    Adding linear rails won't really do anything. Linear positioning (wheels, rails, rods), linear motion (screws and belts), and the frame all play different roles and should not be used interchangeably. If you wanted to add something, you should think about a second c-beam You would have to redesign you Z axis mounting plate, which wouldn't be hard at all.
     
    Peter Van Der Walt likes this.
  27. Alex Chambers

    Alex Chambers Master
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    sharmstr likes this.
  28. phoenix fab

    phoenix fab Well-Known
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    Awesome I’ll take a look at it
    I’m thinking if I do add them I can use some left over cbeam pieces for cross bracing since the v-wheels and inside plate won’t be there afterwards
     
  29. sharmstr

    sharmstr Master
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    That's exactly what I did.

    [​IMG]
     
  30. phoenix fab

    phoenix fab Well-Known
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    Do you feel that it made a significant difference in the cut quality? I think that since my y axis beams are 3000mm they’re flexing way to much when transversing the x and y axis when cutting like a triangle or curve
     

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