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Thread: After 10 month I cannot cut a circle and dril rectangular bolt pattern

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    Default After 10 month I cannot cut a circle and dril rectangular bolt pattern

    I'm building for 2 year a DIY CNC and for the last 10 month trying to use it with no accuracy.

    SETUP
    table CNC 1500mmx1000mmx300mm
    Extruded rails with Vslot wheels
    1.5kw spindle
    NEMA 23 - 345oz*in at 1/8
    Belt GT3 and pulley (16T) with strong tension
    Drivers DQ542MA at 24v
    Controller parallel Breakout tBoard
    Mach 3

    WORKING
    All systems in mach 3 are working OK controlling all movements and spinle

    ISSUE
    When I run the wizard from mach3 to drill a rectangular bolt (hole) pattern in the X axis (1500mm) the first and last drill hole are OK but the interior holes get misaligned in odd and even rows.(look picture)
    http://www.cnczone.com/forums/attach...d=375586&stc=1
    The error is always the same between rows.
    I have changed motors, drivers, belts and pulleys but the issue remains.
    I have swapped X and Y outputs from parallel breakout board but issue is always on X axis
    why is this happening?

    Similar Threads:
    Attached Thumbnails Attached Thumbnails After 10 month I cannot cut a circle and dril rectangular bolt pattern-img_20171014_182448-jpg  


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    Member ger21's Avatar
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    Default Re: After 10 month I cannot cut a circle and dril rectangular bolt pattern

    It looks like a setscrew on a pulley is loose.
    Or the machine lost position at some point.

    If it's repeatable, it's more likely a loose pulley.

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

    JointCAM - CNC Dovetails & Box Joints
    [URL]http://www.g-forcecnc.com/jointcam.html[/URL]

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Default Re: After 10 month I cannot cut a circle and dril rectangular bolt pattern

    It is always repeatable
    X axis has 2 motors to drive it conected to the same driver
    I have checked that before but I will re check pulley screws again
    Thank you



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    Default Re: After 10 month I cannot cut a circle and dril rectangular bolt pattern

    I agree that it could be a loose pulley. Or a large amount of backlash.

    You can see the toolpath from the picture. It drilled the leftmost vertical column of holes traveling up with the backlash causing each hole to be slightly low. Then it drilled the next column traveling down and the backlash caused each hole to be slightly high.

    Steve



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    Default Re: After 10 month I cannot cut a circle and dril rectangular bolt pattern

    being backlash the top and bottom holes should also be misaligned (they are OK). Is this correct?



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    Member ger21's Avatar
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    Default Re: After 10 month I cannot cut a circle and dril rectangular bolt pattern

    Are the holes drilled, or routed as circles?

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

    JointCAM - CNC Dovetails & Box Joints
    [URL]http://www.g-forcecnc.com/jointcam.html[/URL]

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Default Re: After 10 month I cannot cut a circle and dril rectangular bolt pattern

    They are drilled with mach3 wizard 'rectangular bolt pattern'



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    Default Re: After 10 month I cannot cut a circle and dril rectangular bolt pattern

    Quote Originally Posted by flyboy_____ View Post
    being backlash the top and bottom holes should also be misaligned (they are OK). Is this correct?
    The top and bottom rows would have been cut after a horizontal movement. Any vertical backlash skewing a column of holes lower would still be present as the head moves horizontally to a new column. So the top and bottom rows of holes could appear "perfect" even though they may all be misaligned by the same amount.

    Steve



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    Default Re: After 10 month I cannot cut a circle and dril rectangular bolt pattern

    Quote Originally Posted by flyboy_____ View Post
    I'm building for 2 year a DIY CNC and for the last 10 month trying to use it with no accuracy.

    SETUP
    table CNC 1500mmx1000mmx300mm
    Extruded rails with Vslot wheels
    1.5kw spindle
    NEMA 23 - 345oz*in at 1/8
    Belt GT3 and pulley (16T) with strong tension
    Drivers DQ542MA at 24v
    Controller parallel Breakout tBoard
    Mach 3

    WORKING
    All systems in mach 3 are working OK controlling all movements and spinle

    ISSUE
    When I run the wizard from mach3 to drill a rectangular bolt (hole) pattern in the X axis (1500mm) the first and last drill hole are OK but the interior holes get misaligned in odd and even rows.(look picture)
    http://www.cnczone.com/forums/attach...d=375586&stc=1
    The error is always the same between rows.
    I have changed motors, drivers, belts and pulleys but the issue remains.
    I have swapped X and Y outputs from parallel breakout board but issue is always on X axis
    why is this happening?
    Is this a machine that uses belts instead of racks with pulleys instead of pinions? That works pretty well with 3D printers, which are very lightly constructed and need to move fast, but which don't have to contend with counter-forces. It works less well at moving the axes of CNC routers; the belts tend to flex too much, leading to inaccuracies like those in your pictures. If you post some detailed photos of the machine you built, we might be able to point out areas for improvement.

    [FONT=Verdana]Andrew Werby[/FONT]
    [URL="http://www.computersculpture.com/"]Website[/URL]


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    Default Re: After 10 month I cannot cut a circle and dril rectangular bolt pattern

    What's shown in the pictures has nothing to do with belt flex.

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

    JointCAM - CNC Dovetails & Box Joints
    [URL]http://www.g-forcecnc.com/jointcam.html[/URL]

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Default Re: After 10 month I cannot cut a circle and dril rectangular bolt pattern

    I've tried in mach3 software to enable 1.5mm of backlash in X axis and the rows align the holes, perfectly and consistent, but with that I cannot do circles, because in all 2 transitions of the quadrant (were X axis inverts motion) I get a 1.5mm bump, meaning that backlash wasn't needed.

    I send a photo of one of the 2 X axis motors.
    Belt goes under the extruded profile

    Attached Thumbnails Attached Thumbnails After 10 month I cannot cut a circle and dril rectangular bolt pattern-img_20170916_180850-jpg  


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    Default Re: After 10 month I cannot cut a circle and dril rectangular bolt pattern

    I still have this issue.

    If I cut a wizard rectangular bolt pattern
    in X axis the extremitiess holes are aligned just interior holes are missaligned between even and uneven rows. Y axis is OK

    If I rotate the wizard 90 degree X axis is ok and the same missalignement occurs in the Y axis.

    If seams to be software. Is there any alternative software that supports RNR 4axis breakboard?



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    Default Re: After 10 month I cannot cut a circle and dril rectangular bolt pattern

    Have you looked at the G-code generated by the wizard? Have you tried a known working code (written by hand or in some CAM software)? Thousands (if not millions) people use Mach3 successfully, so I don't think the software itself is the problem.



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    Default

    Quote Originally Posted by CitizenOfDreams View Post
    Have you looked at the G-code generated by the wizard? Have you tried a known working code (written by hand or in some CAM software)? Thousands (if not millions) people use Mach3 successfully, so I don't think the software itself is the problem.
    I've drawn a pattern in dxf and converted to gcode and same issue occurs.

    X axis has 2 motor nema34 and Y axis 1 motor nema34.

    If I move each axis in one direction all measures are ok, but if axis reverses the missalignement occurs.



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    Default Re: After 10 month I cannot cut a circle and dril rectangular bolt pattern

    Quote Originally Posted by flyboy_____ View Post
    If I move each axis in one direction all measures are ok, but if axis reverses the missalignement occurs.
    Then I suspect you either have physical backlash somewhere, or incorrect anti-backlash settings in Mach3.

    Try disabling all anti-backlash features in the software and eliminate the physical backlash the best you can.



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    Default Re: After 10 month I cannot cut a circle and dril rectangular bolt pattern

    I have disabled backslash in software and belts are super tight, and pulleys and motors super tight.
    X and Y axis have different assemblys and error is the same.
    I believe now it could be setup of drivers DQ542MA or motor tunning Pulse Dir settings...
    Unfortunatly I dont know what to look for.



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    Default Re: After 10 month I cannot cut a circle and dril rectangular bolt pattern

    Quote Originally Posted by flyboy_____ View Post
    I believe now it could be setup of drivers DQ542MA or motor tunning Pulse Dir settings...
    You might be onto something. Try inverting your pulse signal polarity. Also make sure PULSE+ and PULSE- wires to the DQ542 are not swapped.



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    Default Re: After 10 month I cannot cut a circle and dril rectangular bolt pattern

    Yes. Extrenal holes are aligned correctly, Missalignement only occours interior holes and are perfectly aligned between even and uneven rows.



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    Default Re: After 10 month I cannot cut a circle and dril rectangular bolt pattern

    will check that and try swaping them.thanks



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After 10 month I cannot cut a circle and dril rectangular bolt pattern

After 10 month I cannot cut a circle and dril rectangular bolt pattern