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Upgraded 3018 Pro using MGN15H Linear Rails and a 500w Spindle

Discussion in 'CNC Mills/Routers' started by dJOS_500, Jul 17, 2022.

  1. dJOS_500

    dJOS_500 Journeyman
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    I stopped by Jaycar today and bought 5 meters of their AWG 22 spec, shielded, flexible microphone cable.

    I realised that the cable is actually good for 4A when used with stepper motors as there are 2 wires per winding (AWG 22 = 2A per wire).

    I also found a number of CNC suppliers selling an apparently identical spec cable for use with stepper motors, so that sealed the deal.

    This stuff is really nice and seems perfect for use in cable chains.


    4 Core Screened Professional Microphone Cable - Sold per metre - Sold per metre | Jaycar Electronics
     
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  2. Alex Chambers

    Alex Chambers Master
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    If I understand what you said above correctly I think you have got that wrong. Although there are two wires to each stepper motor coil they are part of one circuit. The same current flows in both wires - along one wire, through the stepper motor coil and the along the other wire.

    Alex.
     
    #92 Alex Chambers, Nov 29, 2023
    Last edited: Nov 29, 2023
  3. dJOS_500

    dJOS_500 Journeyman
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    Hmm, I’m not running them over 2A per phase so I should be fine. By my calculations these wires are good for about 2.2A each based on the number of conductors.
     
  4. dJOS_500

    dJOS_500 Journeyman
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    @Alex Chambers I double checked with a local CNC supplier that uses this spec cabling for their 3A NEMA23 steppers, and they advise that the cable is good for up to 3A per wire at a distance of 5.5m. Apparently they have tested it at up to 7A peaks without issues, but unsurprisingly don't recommend it.

    Seems reasonable to me.
     
  5. dJOS_500

    dJOS_500 Journeyman
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    My first new stepper cable came out great! And my Z Axis now works! I just need to make the X and Y cables now. The XLR connectors pair perfectly with this cable - I guess I shouldn't be surprised seeing as it's sold as Microphone cable! :D

    IMG_9539.jpeg IMG_9540.jpeg
     
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  6. Loggy

    Loggy Well-Known
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    A thing of beauty.

    It stands to reason it's a nice cable for this ;) because I'm the guy that uses Ethernet cable for speakers.
    I either twist 8 into 4, then into 2 per speaker for the PA.
    Or 8 into 4 for the long run outside to our party/workshop area's stereo pair.
    The wires' colour-coding helps me remember who's who.
     
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  7. dJOS_500

    dJOS_500 Journeyman
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  8. Loggy

    Loggy Well-Known
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    It's too late for me... save yourself man! lol

    Besides, when it is time to set the gear up for reals, my friends know to bring their own good cabling.
    I just bring nice, heavy black boxes, and the best music
     
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  9. dJOS_500

    dJOS_500 Journeyman
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    lol, I’m not an audio-phool, but when you spend $12k AUD on your speakers (many years ago before those little money suckers, we call kids, arrived on the scene), $60 for a roll of decent OFC cables seems cheap. :D
     
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  10. Loggy

    Loggy Well-Known
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  11. dJOS_500

    dJOS_500 Journeyman
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    I made an X axis cable cable and ran into an odd issue. I must have made a config error somewhere as it energises correctly, but then won’t move.

    Same result on the Y axis - X and Y use the same model motors. I double checked my wiring and it’s definitely correct and even matches with my old cables. I checked every connection with my multimeter and everything has continuity and minimal resistance. :(

    I might move on to the limit switches and come back to it.
     
  12. David the swarfer

    David the swarfer OpenBuilds Team
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    what noise doe sit make instead of moving?
     
  13. dJOS_500

    dJOS_500 Journeyman
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    None at all, however you can hear the initial energise sound and it does hold position.
     
  14. David the swarfer

    David the swarfer OpenBuilds Team
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    what are the max rate and acceleration settings?
     
  15. dJOS_500

    dJOS_500 Journeyman
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    Quite low, in fact identical to what I ran with regular GRBL.

    Code:
    axes:
      shared_stepper_disable_pin: I2SO.0
      x:
        steps_per_mm: 400.00
        max_rate_mm_per_min: 1500.000
        acceleration_mm_per_sec2: 1000.000
        max_travel_mm: 278.000
        soft_limits: true
        homing:
          cycle: 2
          allow_single_axis: true
          positive_direction: false
          mpos_mm: 0.000
          feed_mm_per_min: 100.000
          seek_mm_per_min: 1000.000
          settle_ms: 250
          seek_scaler: 1.100
          feed_scaler: 1.100
    
        motor0:
          limit_neg_pin: gpio.36
          limit_pos_pin: NO_PIN
          hard_limits: true
          pulloff_mm: 1.000
          stepstick:
            step_pin: I2SO.1
            direction_pin: I2SO.2:low
    My working Z axis for comparison:

    Code:
    z:
        steps_per_mm: 406.00
        max_rate_mm_per_min: 2500.000
        acceleration_mm_per_sec2: 1000.000
        max_travel_mm: 100.000
        soft_limits: true
        homing:
          cycle: 1
          allow_single_axis: true
          positive_direction: false
          mpos_mm: 0.000
          feed_mm_per_min: 100.000
          seek_mm_per_min: 1000.000
          settle_ms: 250
          seek_scaler: 1.100
          feed_scaler: 1.100
    
        motor0:
          limit_neg_pin: gpio.34
          hard_limits: false
          pulloff_mm: 1.000
          stepstick:
            step_pin: I2SO.3
            direction_pin: I2SO.4
    
     
  16. dJOS_500

    dJOS_500 Journeyman
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    It was a config issue, as soon as I connected my X limit switch, it started working. :duh:
     
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  17. dJOS_500

    dJOS_500 Journeyman
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    Today I finished writing up the stepper motors and started working on the limit switches.

    Unfortunately, I ran into a couple of issues.

    1/ the inductive limit switches I was planning to use need 12v-24v and my board only supplies 5v. I can get around this by supplying power separate from the board. It’ll be a bit of a pain, but not a big deal.

    2/ the mini XLR jacks suck to work on and I melted two of them before giving up in frustration. I was a bit surprised as the sockets where not an issue at all.

    I think I’m going to switch to GX12’s or GX16’s for the limit switches.

    in the mean time, I ripped out the mini XLR sockets and just wired my limit switches direct to the board with my old cables.

    And then my lovely wife requested my presence to assist with Sunday arvo chores. So I haven’t had a chance to test anything. :p
     
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  18. dJOS_500

    dJOS_500 Journeyman
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  19. Loggy

    Loggy Well-Known
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    Things have progressed here too...
     

    Attached Files:

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  20. Loggy

    Loggy Well-Known
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    A wipe with tissue showed the parts weren't clean of grit etc.
    And disassembly showed they weren't as square and flat as they could be either. Work continues..
     
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  21. dJOS_500

    dJOS_500 Journeyman
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    Looking good!

    Mine weren’t clean either, but taking them apart and cleaning them in isopropyl alcoho, and then lubricating with a dry lubricant does the trick.

    I prefer to use SuperLube grease on my linear bearings, but that seems to attract dust and crap into them.
     
  22. Loggy

    Loggy Well-Known
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    Yes, dry lube might be the go.

    Next stage is making a spindle clamp. Being the only weirdo who would keep using a 42mm "775" motor in an upgraded setup; I have to make it myself. Besides, I know how to engrave well with that motor so I don't want to change too much at once and take out engraving.
     
  23. dJOS_500

    dJOS_500 Journeyman
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    You could just print an insert in ABS and drop that inside a 65mm aluminum mount.
     
  24. Loggy

    Loggy Well-Known
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    Quite likely, however more than a few of the mounts I've looked at don't share the 70mm x 20mm bolt centres with this 'sliding block', necessitating an adapter plate. Which I'll avoid if I can, keeping the angle of the dangle as short as possible and all.
    Besides this'll merely be iteration zero of the new machine... And it'll have to make some more money before it gets too much more honey ;)
     
  25. dJOS_500

    dJOS_500 Journeyman
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    Ah that sucks. hey, do you have a build topic? I'd like to follow your exploits as Im always keen to see how others solve challenges.

    PS, I don't mind if you just want to post updates in this topic. :cool:
     
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  26. Loggy

    Loggy Well-Known
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    I was just going to put some updates here but if you think it's a better idea I'll start a new one. I didn't think it'll be comprehensive, so I thought by adding some bits to yours it just adds a variation, seeing as your build was my inspo. Despite me continually ordering the wrong bits, l'll see how I go remembering to take pics :)
     
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  27. Loggy

    Loggy Well-Known
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    Are there many other Aussies on here?
     
  28. dJOS_500

    dJOS_500 Journeyman
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    Honestly, im not sure.

    Btw, my comment wasn't intended to be a "get off my lawn" - I just wondered if I was missing any interesting updates. :)

    PS, ordering the wrong bits is a right of passage! :ROFL: I've lost count of the parts I've mistakenly ordered! :rolleyes:
     
  29. Loggy

    Loggy Well-Known
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    Not taken that way at all :) And it's a good suggestion.

    Instead of counting my badly ordered bits, I might just weigh them all up at the end lol.

    I'll drop you a link when I set up a new topic.. and thanks again for your excellent write-up here :))
     
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  30. dJOS_500

    dJOS_500 Journeyman
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    Awesome.

    My "extras" just go into a box of parts I'll prolly need for something ... one day. :D

    Good stuff. No worries, it's been a lot of fun tinkering in the world of CNC. I did the same thing with 3D printing - I started with the cheapest printer I could find and learnt from there. The below printer started life as an AnyCubic MegaZero v1 that I got on sale for $170 Aussie Micro-Peso's. :ROFL:

    IMG_9332.jpeg

    Here's the underside:

    IMG_9323.jpeg
     
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