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Lead issues all over the place

Discussion in 'CNC Mills/Routers' started by gregers05, Aug 9, 2019.

  1. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    No BlackBox doesnt have those troubles, assumed Xpro as they skip often.

    1) check Grbl Settings, Maximum Rates. With a leadscrew machine limit that to around 3000mm/min to start off can find your ceiling another time
    2) check that your cuts arent too aggresive
    3) check that router rpm isnt too low (you will hear it struggling).
    4) double check wiring for loose or intermittent connections to motors
    5) check that leadscrew couplers and motor side of couplers are very secure and not slipping on the shafts
     
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  2. sharmstr

    sharmstr OpenBuilds Team
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    Peter. Can emi cause this? It seems to perfect to be emi, but ....
     
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  3. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    I would expect usb disconnects but i do see he mentioned in the lead machine thread he has them bundled together. This build has been weird since day one, i think it just needs a good lookover :)

    My theory is that something happens during rapids, as the cuts self looks good?


     
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  4. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    my phone is faster (; no wonder you have software issues. My last 1.xghz cpu was when i was in highschool in 2003
     
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  5. gregers05

    gregers05 Well-Known
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    Ill look at these thing tonight and see what i find. Just strange to me that it hasnt happened on any other run.
     
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  6. gregers05

    gregers05 Well-Known
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    Yes, it probably needs someone that can tell if there is something not right, however its just me and this being my first cnc idk whats normal.and whats not.

    I also feel like its in the rapids because the cuts are turning out great, just in the wrong spot!
     
  7. gregers05

    gregers05 Well-Known
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    Lmao, yeah it sucks, but its just running gcode, doesnt need to be anything fancy. I have 2 other computers to do the heavy lifting. I saw a lead build somewhere else where someone used this same exact tablet with good results. Ill upgrade later but trying to keep startup costs lower since im 2k+ into the build
     
  8. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Make no mistake, keeping that serial buffer full is hard work. If the serial buffer starves, the machine (firmware) planner cannot think ahead. When it cannot think ahead, things come to jerky movements and sudden unexpected stops. Its not quite as trivial as you would think at first glance. Apart from feeding gcode it runs the query loop, 3d viewer updated at 60 frames per second, moves along the gcode editor to show which row is running, processing the command queue and serial logs. But hey, i just wrote it, so if i think that PC is too slow what do I know right (;
     
  9. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Thus for a couple weeks I ask for photos of your setups. Might just see something wrong? Or at least eliminate some things we suspect that might just be right
     
  10. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    To me too, making me wonder if your motor wiring doesnt have a loose connection that gets tucked on breaking connection during the rapid moves
     
  11. gregers05

    gregers05 Well-Known
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    lol, fair enough. I will upgrade, but just not in the budget at the moment. I would like to eventually go to an actual touchscreen laptop instead of a tablet or a microsoft surface pro.
     
  12. gregers05

    gregers05 Well-Known
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    any specific photos? I could take 100+ pics if I wanted to
     
  13. gregers05

    gregers05 Well-Known
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    possibly. I went around and double checked. I have all of my connectors zip tied together as instructed in the video.
     
  14. gregers05

    gregers05 Well-Known
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    Here are GBRL settings. I changed the max feed from 5000 to 3000 on $110 and $111 and suggested.


    $0 Step pulse time, 10 microseconds
    $1 Step idle delay, 255 milliseconds
    $2 Step pulse invert: 0
    $3 Step direction invert
    Invert X Direction off
    Invert Y Direction off
    Invert Z Direction off
    $4 Invert step enable pin ENABLE
    $5 Invert limit pins. DISABLE
    $6 Invert probe pin DISABLE
    $10 Status report options 1
    $11 Junction deviation, 0.020 millimeters
    $12 Arc tolerance, 0.002 millimeters
    $13 Report in inches. DISABLE
    $20 Soft limits enable DISABLE
    (Enable and Save Homing first before enabling)
    $21 Hard limits enable ENABLE
    $22 Homing cycle enable ENABLE
    $23 Homing direction invert 3
    $24 Homing locate feed rate, 100 mm/min
    $25 Homing search seek rate, 100 mm/min
    $26 Homing switch debounce delay, 250 milliseconds
    $27 Homing switch pull-off distance, 5 millimeters
    $30 Maximum spindle speed, 22000 RPM
    $31 Minimum spindle speed, 0 RPM
    $32 Laser-mode enable DISABLE
    $100 X-axis steps per 200 millimeter
    $101 Y-axis steps per 200 millimeter
    $102 Z-axis steps per 200 millimeter
    $110 X-axis maximum rate, 3000 mm/min
    $111 Y-axis maximum rate, 3000 mm/min
    $112 Z-axis maximum rate, 25000 mm/min
    $120 X-axis acceleration, 150 mm/sec2
    $121 Y-axis acceleration, 150 mm/sec2
    $122 Z-axis acceleration, 150 mm/sec2
    $130 X-axis maximum travel, 750 millimeters
    $131 Y-axis maximum travel, 815 millimeters
    $132 Z-axis maximum travel, 90 millimeters
     
  15. sharmstr

    sharmstr OpenBuilds Team
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    Your steps per mm are too perfect. Did you ever calibrate the machine?
     
  16. gregers05

    gregers05 Well-Known
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    I thought the same, but yes, twice to be sure. If that was the problem, i would be having this issue on the other cuts as well right? The others came out perfect. The only reason i have it split into two programs is the first is with the v bit and the second program is with a 1/4" endmill for the large text
     
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  17. sharmstr

    sharmstr OpenBuilds Team
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    Sorry, I wasnt saying its your problem. I'm saying they are too perfect so I assumed you hadn't done it.
     
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  18. gregers05

    gregers05 Well-Known
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    Yep, no offense taken! But i thought yhe same thing you did as well. I even used digital calipers to measure, so if it was off it was by very very little
     
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  19. Gary Caruso

    Gary Caruso OpenBuilds Team
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    Can you post the cnc file? I remember seeing another person struggle with a job to find an issue in fusion that caused rapids within the material. Something with retract height and linking objects.
    I don't use fusion so not sure of the details but I can look at the code. Save the file as an attachment.
    Gary
     
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  20. sharmstr

    sharmstr OpenBuilds Team
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    His file is here but that doesnt seem to be the issue if you look at the pics: Lead issues all over the place
     
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  21. Gary Caruso

    Gary Caruso OpenBuilds Team
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    Ok, you're right, file looks fine, 1905mm/min (75ipm) is a bit quick to start off with..
    I think if you just slow down, try 60ipm, and turn your current up a 1/4 turn on all axis (stock should be about half way on each axis), you will be fine.
    Try it again on some scrap.
    Cheers
    Gary
     
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  22. gregers05

    gregers05 Well-Known
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    Alright, I was busy all weekend so didnt get a chance to play around with the router any. Capped feed rate at 3000 and changed the gcode from 75ipm to 60ipm. I had also turned the current up a 1/4 turn, but got a fault on one of the y-axis motors as soon as I started the program. So I turned them all down and then up 1/4 turn from there.

    Ran the program on the back of the original piece since it was now scrap. Everything ran perfect! Getting some fuzzies I the bottoms of the pockets, but that could be unavoidable in MDF, or could be my endmill getting dull.

    Appreciate all the help so far! It was likely the max feed rate of 5000 that was causing it to skip steps.
     
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