It's alive! MPCNC build from Luxembourg

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This topic contains 9 replies, has 4 voices, and was last updated by  Jeff 1 week, 2 days ago.

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  • #113010

    Jeff
    Participant

    This is my first dive into the world of CNC milling. Super happy with the MPCNC so far, but still lots of things to learn and tweak.

    Pics:

    I currently have a working area of 600x600mm. I’m thinking about shortening the y axis to something like 450mm though. This is also the reason why I haven’t cut the MDF base to size yet. I’m still undecided on final dimensions.

     

    I use M8 t-track slots to clamp down my stock. I’m going to add a couple more tracks so I can more easily reach smaller stock with the clamps.

    I mounted my router directly to the z-axis tubes, without using the tool mount.

    This allowed me to push it a little closer to the gantry.
    To be honest, the difference in distance is so low that I wouldn’t do it again. It seemed like a good idea at the time, but I doubt there’s any benefit.

    First cuts in plywood!

    I had to stop the first cut (on the left) due to chatter and the y axis drifting. After further inspection I noticed that I had forgotten to tighten down some of the bolts on the underside of the gantry…

    The second cut worked much better! 🙂
    There was some tear out, presumably because I was using an 8mm router bit. Unfortunately that’s the smallest router bit I own. 1/8” end mills are still on the way.

     

    Auto squaring rocks! 90° right off the bat.
    X and Y axis steps/mm need some minor tweaking, but this a superb starting point.

    The brains. I’m using a Duet 2 Wifi board. I love how you can reconfigure everything without the need of recompiling / uploading firmware. Everything is configured through gcode.

    Some minor issues I ran into during my build:
    – Using thick zip ties to mount the belts is a bad idea. They will never stretch out completely under load. Because of this they flex quite a bit during axis movement. Normal zip ties work much better. I ended up going with printed belt tensioners.
    – Forgetting to tighten down some of the bolts after assembly…
    – I can’t get 2 of the bearings on the XYZ parts to press against the z-axis tubes properly. I will make a post about this in Troubleshooting after I’ve verified that all bolts are reasonably tightened.

    Since I already owned the duet and the makita router, this was a very inexpensive build. This is such an awesome yet cheap design. 🙂

    • This topic was modified 1 week, 5 days ago by  Jeff.
    • This topic was modified 1 week, 5 days ago by  Jeff.
    2 users thanked author for this post.
    #113222

    Ryan
    Keymaster

    Your setup seems pretty well thought out and you are already get some seriously decent results. Welcome to the Crew.

    1 user thanked author for this post.
    #113590

    plinius
    Participant

    Congrats ! I also live in Luxembourg and I am considering this build, may I ask you where you bought the pipes and other components ?!?

    Best regards –p

    #113628

    Jeff
    Participant

    I got the pipes from here: https://www.metall-kunststoffhandel.de/produkt/edelstahl-rundrohr-25×2-mm-geschliffen-k320/

    Unfortunately, they won’t cut them shorter than 100mm, and I’m using 64mm on the Z axis.
    I ended up just buying a 300mm piece and cutting it myself using an angle grinder.
    Also be aware that they do not come deburred. You’ll have to clean up the edges yourself.

    I also made this list back when I was sourcing components: https://docs.google.com/spreadsheets/d/1WyeRwhXcceGOW3yzdSXogg8eyuihRfj_-DrPQ3mrsNg/edit?usp=sharing
    Hopefully that should give you some options.

    If you go through with the build, feel free to bug me if you have questions.

    #113708

    Steven
    Participant

    I bought from here, 8 euro per meter (for 25×2) and 12,50 shipping for everything under 1,5 meter.

    They looked pretty good

    https://www.hoerr-edelstahl.de/Edelstahlrohre-und-Edelstahlprofile/Rund-Rohre-aus-Edelstahl/KONSTRUKTIONS-ROHR-12-bis-114-3-mm-STANDARD-EDELSTAHL.html

     

    • This reply was modified 1 week, 3 days ago by  Steven.
    2 users thanked author for this post.
    #113717

    Jeff
    Participant

    That’s a much better deal. I wonder how I missed that when I was sourcing my parts.

    #113722

    Steven
    Participant

    Found them by accident, ordered a week ago.

    I think it’s the cheapest there is for Belgium.

    #113726

    plinius
    Participant

    Thank you, very kind of you! I was hoping to find the pipes at some local store, I guess shipping from Germany of a 3 meter pipe costs more than the pipe itself !?!?

    #113780

    Jeff
    Participant

    Don’t buy a single 3m long pipe. Have them cut it to size for you, it’s free. 🙂
    The shop Steven suggested will ship up to 1,5m long pipes for 12,50€, and up to 2,5m long pipes for 22,50€.

    1 user thanked author for this post.
    #114044

    Jeff
    Participant

    https://www.youtube.com/watch?v=C0ta8qutNu0

    Did some first test cuts in hardwood (beech) today.
    Of course my phone ran out of battery before I could record any of the faster/deeper cuts.
    Ended up cutting at ~20.000rpm, 1800 mm/min, 5mm depth of cut on a 1/8” single flute china end mill. (chip load of 0.09mm)

    I stopped pushing it further because I started to notice some flexing… no chatter though. 🙂
    Some thoughts on the flexing issue:

    • The er11a adapter I use adds an extra 50mm of height to the entire assembly. That can’t be helpful, but it is stiffer than I expected.
    • Further tightening the belts helped. They seem to really like the high tension.
    • My belt mounts/tensioners can stretch ever so slightly. They were hastily designed; all the force resides on the threads of an m3 screw… Definitely worth revisiting them.
    • I’m fairly certain the main culprit are my XYZ Burly parts…
      Looking at them closely, I noticed they only have 2 perimeters, yet I intended to print all parts with 4 perimeters and follow the infill recommendations.
      I must have printed them with my default settings by accident, which are 2 perimeters at 15% infill…
      Going to reprint those with proper settings.
    • This reply was modified 1 week, 2 days ago by  Jeff.
    • This reply was modified 1 week, 2 days ago by  Jeff.
    • This reply was modified 1 week, 2 days ago by  Jeff.
    • This reply was modified 1 week, 2 days ago by  Jeff. Reason: Edit: Can't figure out how to embed a youtube video
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