New problems on my z-axis

New Home Forum LowRider Troubleshooting – LowRider New problems on my z-axis

This topic contains 5 replies, has 2 voices, and was last updated by  TJ 2 weeks, 3 days ago.

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  • #108646

    TJ
    Participant

    I’m still having problems with my z-axis, so I took a video to show what’s happening.

    First off, my z axis is working perfectly when I control it manually.  Whether I do it through repetier or with the LCD board, both motors work fine. All axis work fine, in fact.

    But when I run an actual cnc program and all axis are moving, that seems to be when things get messed up. In the video you can hear the grinding sound. The router is off so it’s otherwise quiet.

    By the way, when I disconnect and power down the motors, its very easy to twist the screw to move the axis up and down so its not super tight. And as I mentioned, everything works fine when I control manually.

    Any ideas? I’m at a loss for ideas right now.

     

    #108676

    Jamie
    Participant

    Can you post the first hundred or so lines of your gcode? Not sure what I’m looking for but a few possibilities can be eliminated…

    #108679

    TJ
    Participant

    Yes, here are the first 200 lines.  By the way, I just ran it again from an SD Card to eliminate my laptop and Repetier from the equation, and the problem still remains…

     

    ;Project dog5
    ;Created by Estlcam version 11 build 11.113
    ;Machining time about 00:01:24 hours

    G90
    M03 S24000
    G00 X0.0000 Y0.0000 Z0.0000 F2100
    G00 Z2.0000 F480

    ;No. 1: Part 1
    G00 X1.8244 Y90.4306 F2100
    G00 Z0.5000 F480
    G01 Z-6.0000 F180 S24000
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    G03 X3.5430 Y45.0004 I20.8792 J2.4216 F900
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    G02 X25.4391 Y3.4481 I4.9681 J-6.1729 F900
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    G01 X26.4981 Y3.8997 F900
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    G03 X52.0342 Y36.1143 I27.8339 J72.9517 F900
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    G01 X78.5834 Y9.3277 F900
    G03 X80.2759 Y4.2253 I62.8290 J18.0084 F900
    G01 X80.5265 Y3.6126 F900
    G01 X80.7795 Y3.0510 F900
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    G01 X81.0401 Y2.5340 F900
    G01 X81.0919 Y2.4396 F900
    G01 X81.3140 Y2.0561 F900
    G01 X81.3808 Y1.9502 F900
    G03 X84.4293 Y-0.5582 I5.1930 J3.2044 F900
    G01 X84.8015 Y-0.7056 F900
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    G01 X85.3622 Y-0.9046 F900
    G01 X85.7204 Y-1.0146 F900
    G01 X85.8270 Y-1.0435 F900
    G01 X86.2304 Y-1.1426 F900
    G01 X86.3200 Y-1.1621 F900
    G03 X87.8999 Y-1.4155 I3.4526 J16.4727 F900
    G01 X87.9628 Y-1.4224 F900
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    G01 X96.3800 Y-1.0724 F900
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    G03 X104.5821 Y4.3073 I-5.1430 J10.7359 F900
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    G01 X104.9068 Y4.5215 F900
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    G01 X105.2161 Y4.7452 F900
    G03 X107.3470 Y7.7805 I-3.1097 J4.4487 F900
    G03 X105.5746 Y12.7959 I-4.8674 J1.1008 F900
    G01 X105.3323 Y12.9972 F900

    #108683

    Jamie
    Participant

    It looks like youve done everything right as far as software. Try decreasing the z rapid feed rate to 180 instead of 480. I am guessing this will get you up and going at least, and your manual jog will work like your cam job.

    It looks like Estlcam uses the rapid feedrate to go up, and the plunge feedrate to go down, which is reasonable. After all, going up is not cutting and going down is potentially cutting. But going up you are going against gravity so you need more torque. Slowing down should help.

    BUT at 480 you should still have plenty of torque, so something is still wrong and needs to be fixed. If you are borderline when raising the tool then for a long job if you could lose some steps and best case you only ruin your work.

    Maybe with motors energized, try turning the coupler with your hand and see if you can skip steps with your hand. If so, see if both sides feel equal. You could use a multimeter to measure the current through each winding of each motor, but setting that up is quite a hassle.

    3 users thanked author for this post.
    #108688

    TJ
    Participant

    Thanks, I’ll try those things in the morning. I was thinking that today I had added an aluminum beam for wire management, as well as connected shopvac hose, so I’ve recently added some additional weight. If I’m srtessing the torque with my feed rate, that additional weight certainly won’t help.

    By the way, I can definitely skip steps with my hand by holding the coupler. I tried that today, but I wasn’t sure if that’s normal. Is that a bad sign?

    Thanks again!

    #108725

    TJ
    Participant

    Jamie – thank you so much!  I woke up early this morning anxious to try slowing down the z rapid feed rate, but lo and behold when I went into my estlcam settings I found that my previous settings had disappeared. It seems that my z feedrate was trying to run much faster than 480 in Marlin. So I set it back to 480 and everything ran smooth as a baby’s butt.

    I was so focused on mechanical and electrical, I completely missed the obvious. This was good though, I learned a lot more about the software, firmware, and gcode along the way.

    This morning im leaving on a short family vacation and it’ll be much more pleasant knowing I’ve got a working machine waiting for me when I get back!

    2 users thanked author for this post.
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