MPCNC in Switzerland

This topic contains 25 replies, has 10 voices, and was last updated by  Raphael 2 months, 2 weeks ago.

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  • #70986

    Raphael
    Participant

    Progress on my colorfull MPCNC:

    IMAG0727

    So far I printed all the parts and everything except the drag chains and the 6/32 screws has arrived.

    The pipe cutter broke after about 20 cuts, even though it claimed to be made for stainless steel…

    The working area is ~60cm x 50cm x 7cm (23.5′ x 19.5′ x 2.5′).

     

    Some build progress pictures of the base plate:

    IMAG0722
    IMAG0723
    IMAG0726

    Ryan, if you ever do another revision of the MPCNC, please please please use M4 screws instead of 6/32, they were almost impossible to find, even Amazon and Aliexpress proved difficult, and metric screws should be easy to source no matter where you live…

    But thank you for this great design, so far it was a fun building experience šŸ™‚

    1 user thanked author for this post.
    #72060

    Raphael
    Participant

    The 6-32 screws and the drag chain finaly arrived last week, so here are some more pictures of my build progress:

    IMAG0770
    The legs stick through the main plate so that I could lift the entire machine by about 20mm if I ever need some more Z space.

     

    IMAG0775
    The bottom_corner and lock_corner parts are solvent welded together witch acetone.

     

    IMAG0774
    XY gantry, this was a bit difficult to get square, it’s still 1mm off at 300mm distance…

     

    IMAG0773
    Z axis.

     

    IMAG0782
    The drag chain for the Z axis and spindle/laser cables.

     

    IMAG0783
    Drag chain for the Y axis. I use 10mm steel reinforced GT2 belt, I know it’s not necessary but it’s what I had lying around…

     

    IMAG0772
    Since the spindle tended to get very hot on my old cnc I decided to print a replacement fan that should keep it cooler. It holds up to 10’000 RPM and moves a lot of air.

    I hope to finish the build this week, the only things left are the electronics and the calibration.

    3 users thanked author for this post.
    #72092

    Ryan
    Keymaster

    I hope to finish the build this week

    Finish is a strong word….”Use it this week” is more like it. There is always fun stuff to try out.

    Cool build!

    #72098

    Barry
    Participant

    Holy crap!Ā  The spindle should support itself now!Ā  šŸ˜†

    #72189

    Raphael
    Participant

    Holy crap! The spindle should support itself now! ?

    I didn’t even think about that, the additional lift should make it a bit lighter ?

    And yeah, finished is the wrong word, I hope to get it running so that I can cut the parts for the electronics enclosure.

    After that there are some small things I would like to make, and since I live in an apartment I should build an enclosure for the entire MPCNC to reduce the noise a bit…

    #72598

    Bill
    Participant

    You know, if you bumped the RPMs up a little more you could do away with the Z stepper, just fly up or down as needed. šŸ™‚

    #72659

    Raphael
    Participant

    Well, why not take it a step further and just mount the spindle to a quadcopter?

    No more gantries that take up all the space in your garage and infinite build volume! ;D

    Shit, now I’m actually thinking if something like that would be remotely possible šŸ˜€

    #72678

    Brandon
    Participant

    Well, why not take it a step further and just mount the spindle to a quadcopter?

    No more gantries that take up all the space in your garage and infinite build volume! ;D

    Shit, now Iā€™m actually thinking if something like that would be remotely possible ?

    And it would blow chips out of the way as well.

    #72684

    Jeffeb3
    Participant

    Have you seen the videos of quadcopters painting fences? I think there’s still a lot physics that aren’t going to be modeled well enough to measured fast enough to make that work… But it would be fun to try! It might be more possible with something that gives you less force back, like extruding paint, and in an environment with accurate measurements, like fixed IR cameras and fiducials on the quad. Maybe lasers?

    #72736

    Raphael
    Participant

    Since the quadcopter moves by tilting, the spindle would have to be mounted on a gyro. As an added bonus this makes it into a six axis machine šŸ˜€

    And I don’t remember the name of that router that is a mix between cnc and handheld… It uses a camera, markers on the workpiece and a display to guide the user in moving it, and it has an inch or so in the x and y axis that it can correct if the user pushes it of the path. The quad would need a system like that to correct for turbulences…

    #73137

    Raphael
    Participant

    Everything is working šŸ™‚

    I did a quick square calibration and it was only off by less than 0.5mm on a 500mm diagonal.

    I have different stepper drivers for the X axis than the rest of the axis, and even though they are all A4988 drivers, the current sensing resistor seems to be different. On the X axis I have set the potentiometer to 0.75V and the drivers get a bit hot, on the Y and Z axis I have it set to 1.2V and they barely get warm. All motors stay cold to the touch.

    And here’s the crown test:

    crown-test
    I didn’t have any paper at home, so the whiteboard and marker had to do šŸ™‚

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    #73253

    Raphael
    Participant

    So it turns out that the steel reinforced PU 10mm GT2 belt is too strong, or rather not flexible/bendable enough.

    To get it tight enough for it to run nice over the pulley I have to tighten the cable ties so much that the force on the motors is too much and they start to lose steps when going too fast or when encountering a small obstacle.

    I ordered some normal glas fiber reinforced rubber 6mm GT2 belt which should fix this problem…

    1 user thanked author for this post.
    #74156

    Raphael
    Participant

    I’m working on the calibration again, the spindle is perpendicular to the board now.

    IMAG0851

    Tomorrow I will face the spoilboard, drill a bunch of holes into it and add some threaded inserts.

    Still waiting on the GT2 belt…

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    1 user thanked author for this post.
    #75557

    Raphael
    Participant

    2 steps forward, 1 step back…

    The spoilboard is faced and has a bunch of holes drilled for indexing pins, some of them have threaded inserts for the clamps:

    IMAG0885

    And I built an enclosure:

    IMAG0879
    But for some reason I thought my table was 900×800, when it was actually 1000×900, so I can redo all of that work :/

    #75577

    Jeffeb3
    Participant

    But for some reason I thought my table was 900Ɨ800, when it was actually 1000Ɨ900, so I can redo all of that work :/

    What? No!

    #75636

    Bill
    Participant

    You need to learn to build things too big to start instead of too small… Much better in the long run to cut it down instead of trying to cut up. šŸ™‚

    #75638

    Jeffeb3
    Participant

    What you need is a board stretcher.

    #75649

    BT
    Participant

    I’ve been heard to say, “dang it, I cut it twice and it’s still too short.”

    #75686

    Raphael
    Participant

    Just to clarify, I have to redo the enclosure, not the entire MPCNC šŸ˜‰

    I got all the boards and I’m headed to the local makerspace to cut and drill everything šŸ™‚

    This time I triple checked everything, but I still have the bad feeling that I will mess it up again…

    #75956

    Mick
    Participant

    Since the spindle tended to get very hot on my old cnc I decided to print a replacement fan that should keep it cooler. It holds up to 10ā€™000 RPM and moves a lot of air.

    what’s the specs of your spindle? it looks like a generic Chinese unit which i am looking at getting. I’m just not sure how many watts and what controller.

    #76119

    Raphael
    Participant

    @mick it’s a generic chinese spindle, 500W air cooled, the controller is, as far as I can tell, a 100V DC power supply with a potentiometer to control the output voltage.

    #76124

    Raphael
    Participant

    Update on the enclosure:

    (this time it’s the right size)

    IMAG0893
    Building the lid.

     

    IMAG0894
    Mounting it to the MPCNC.

     

    IMAG0896
    The windows are sealed with an elastic caulk and foam tape is used to seal the lid.

     

    IMAG0898
    Added some led strips.

     

    IMAG0899

    IMAG0902

    That’s it for today. Things I still need to do:

    • Mount the gas springs as soon as they arrive
    • Clean up the wiring/electronics
    • Add a dust collection hose
    • Test how much difference in noise the enclosure makes, maybe add some sound dampening foam
    • Paint it? I’m thinking about a 2 color paint job, 1 for the lid 1 for the base…

     

    #76134

    BillW
    Participant

    An old saying, don’t know if it only English
    Measure twice cut once.

    But for some reason I thought my table was 900Ɨ800, when it was actually 1000Ɨ900, so I can redo all of that work :/

    #76615

    Raphael
    Participant

    The gas springs arrived šŸ˜€

    IMAG0941
    They work like a charm šŸ˜€

    And I made a floating Z axis tool holder šŸ™‚

    IMAG0939

     

    1 user thanked author for this post.
    #94538

    Sancho
    Participant

    Sorry for stupid question, but whe in CH did you managed to get the conduit? I’ve so far tried Hornbach, Buahaus, Jumbo. No luck šŸ™

    #107887

    Raphael
    Participant

    @sancho sorry for the late reply, I moved to a new place and didn’t do any cnc work for a couple of months…

    I ordered my conduit from amazon, since no hardware stores carry the right sizes. I also tried to buy them from Debrunner & Acifer, but they won’t sell to private individuals…

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