Duet controlled micro mill



  • I've been working on this one for a couple months. Using Misumi LX20 actuators with 1mm lead ball screws driven by 1 amp, 1.8 nema 14's on x and y (10 kg of force) and a .9 nema 17 on the Z using 75 mm square, steel bar as the foundation. Tool is driven by a 150K RPM Nakanishi air spindle. The purpose of the build is high accuracy micro machining. I have just ran the first test part, a 9mm diameter sprocket, and it turned out phenomenal (inspecting it with a digital microscope). I plan to try some 3D contouring next and then find the limits in part sized using .5 and .25 mm end mills I have.
    0_1565561956796_20190811_174552.jpg
    0_1565561998282_20190811_174835.jpg


  • administrators

    @3DPMicro very cool! Do you have a particular application in mind or just see how small you can go?



  • Hey Tony. The selling point for this build, to my wife, was to make custom charms (think Alex and Ani) to peddle but I was mainly thinking of 2nd ops for parts made on my Duet controlled FFF (.1 mm extrusion width squirting PEI and PEKK).
    0_1565614642068_1565614568575127749199.jpg



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  • administrators

    @3dpmicro next you need to build a tiny robot arm to lift the parts from the FFF printer to the micro mill!



  • 0_1566020095759_15660196675981663221174.jpg

    I was able to get the motors to run over 1200 RPM (1200 mm/m travel speed) but while using my test program they stuttered when interpolating corners below a certain radius (G2/G3) with 16x ms, interpolated. Still almost silent and smooth at 8x Ms w/o interpolation. I went all over the place with Accel, and jerk with no apparent effect on the stuttering until down, around 600 mm/m. This 2.3 mm thick part took 14 minutes using a .81 mm end mill including interpolating the 6, 1 mm mounting holes. .1 mm axial DOC and 400 mm/m feed.
    The demensions I can measure easily came out within .02 mm

    p.s. for the record i was not actually using the bathroom when I took the picture 😀



  • @3dpmicro said in Duet controlled micro mill:

    my Duet controlled FFF (.1 mm extrusion width squirting PEI and PEKK).

    I saw your old thread about the probing in a hot chamber.
    How is your heated build chamber printer coming along? Can you share some pictures of that?



  • @nitrofreak The chamber is working well. 200 - 210c for Ultem 1010. The machine is an IDEX, has a fairly small work envelope of 100 mm cubed and is very stable mechanically and thermally so manual leveling is all that is needed. I would like to post pictures but decided not to until the Stratasys patent has expired. That was supposed to happen this year but could be extended. I am uncertain of the current status.


 

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