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  1. #1
    I have no idea whats going on here guys.

    My china 3040 does not want to cut out circles.

    I used aspire to generate the gcode and the circles come out as shown in the pic. The cnc doesnt seem to follow the line back to the start.

    Any ideas or suggestions to troubleshoot this would be appreciated.


    Click image for larger version. 

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  2. #2
    Doddy's Avatar
    Lives in Preston, United Kingdom. Last Activity: 21 Hours Ago Has been a member for 4-5 years. Has a total post count of 233. Received thanks 19 times, giving thanks to others 9 times.
    Others will have more experience here, but have you tried a simple square?

    Things I'm thinking - superficially, at least, it looks like you might be losing steps in the x-axis, but I don't know/can't rule out if aspire has a mach3 post-processor and/or if arcs could be causing an issue?, If you repeat the test with a simple 40x40mm square then at least you can start to understand if you're losing steps due to acceleration or max feed rate. When calibrating my machine I usually run a 40mm square with diagonals routed as well (a X in a box) just to get a visual on linearity, etc.

  3. #3
    Quote Originally Posted by Doddy View Post
    Others will have more experience here, but have you tried a simple square?

    Things I'm thinking - superficially, at least, it looks like you might be losing steps in the x-axis, but I don't know/can't rule out if aspire has a mach3 post-processor and/or if arcs could be causing an issue?, If you repeat the test with a simple 40x40mm square then at least you can start to understand if you're losing steps due to acceleration or max feed rate. When calibrating my machine I usually run a 40mm square with diagonals routed as well (a X in a box) just to get a visual on linearity, etc.
    Hi

    The project itself does have a rectangle section that it did cut out fine it's just not in the shot.

    I also recently ran staight grid cuts that appeared to work ok.

    If you have some gcode I could try in mach3 that's not dine in aspire that would be helpful. The circle is suppose to be 8mm in diameter.



    Sent from my SM-N910F using Tapatalk

  4. #4
    Doddy's Avatar
    Lives in Preston, United Kingdom. Last Activity: 21 Hours Ago Has been a member for 4-5 years. Has a total post count of 233. Received thanks 19 times, giving thanks to others 9 times.
    Something like this (below)

    40mm square containing a circle.

    Spindle speed 12000rpm, tool dia 2.5mm (not critical). DOC 0.4mm, feed rate 800mm/m, plunge rate 300mm/m


    Code:
    ( T0 : 2.5 )
    G21 G90 G91.1 G64 G40
    G0 Z3.0
    ( T0 : 2.5 )
    T0 M6
    ( Engrave1 )
    G17
    M3 S12000
    G0 X0.0 Y0.0
    G0 Z1.0
    G1 F300.0 Z-0.4
    G1 F800.0 X40.0
    G1 Y40.0
    G1 X0.0
    G1 Y0.0
    G0 Z3.0
    G0 X5.8579 Y5.8579
    G0 Z1.0
    G1 F300.0 Z-0.4
    G3 F800.0 X10.0 Y2.6795 I14.1421 J14.1421
    G3 X40.0 Y20.0 I10.0 J17.3205
    G3 X10.0 Y37.3205 I-20.0 J0.0
    G3 X5.8579 Y5.8579 I10.0 J-17.3205
    G1 F300.0 Z-0.8
    G3 F800.0 X10.0 Y2.6795 I14.1421 J14.1421
    G3 X40.0 Y20.0 I10.0 J17.3205
    G3 X10.0 Y37.3205 I-20.0 J0.0
    G3 X5.8579 Y5.8579 I10.0 J-17.3205
    G0 Z3.0
    G0 X0.0
    G0 Z0.6
    G1 F300.0 Z-0.8
    G1 F800.0 Y0.0
    G1 X40.0
    G1 Y40.0
    G1 X0.0
    G1 Y5.8579
    G0 Z3.0
    M5
    M30

  5. #5
    cheers ill try this later see what happens.

  6. #6
    I had a similar problem with my 6040 router.The CNC Blog
    Last edited by Kev2960; 28-11-2017 at 08:30 PM.

  7. #7
    Quote Originally Posted by Kev2960 View Post
    I had a similar problem with my 6040 router.The CNC Blog
    Improvement with your mach3 settings. Not perfect but that may be the cutter i am using.

    Click image for larger version. 

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  8. #8
    Quote Originally Posted by dfox1787 View Post
    Improvement with your mach3 settings. Not perfect but that may be the cutter i am using.

    Click image for larger version. 

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    You are not helping yourself. why don't you copy and paste Doddy code and give some feedback as to what is happening and take it one step at a time. You have to establish if you are losing steps or have backlash etc.
    ..Clive
    The more you know, The better you know, How little you know

  9. #9
    Quote Originally Posted by Clive S View Post
    You are not helping yourself. why don't you copy and paste Doddy code and give some feedback as to what is happening and take it one step at a time. You have to establish if you are losing steps or have backlash etc.
    How am i not helping myself. I ran his code but i still had issues so that.

    Once i changed the acceleration the circle cut improved. it was set to 2000 but reducing it to 1500 improved the circle.

    I'm going to run the cut again with the appropriate end mill.

  10. #10
    How am i not helping myself.
    Because you are not actually giving any good info ie. (it was set to 2000 but reducing it to 1500 improved the circle. ) does not mean anything with the parameters that go with it.

    Also you said that you ran his code!! which code Doddy's is the only code I see in this thread and that has a square and circle.

    If you want help you have be more specific with the questions as the crystal ball is broken.
    ..Clive
    The more you know, The better you know, How little you know

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