My new toy - micro bench drill mill machine

Discussion in 'Machine Modifications' started by kadora, Dec 28, 2017.

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  1. Dec 28, 2017 #1

    kadora

    kadora

    kadora

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    Hello Friends
    I would like to show you small mill-drill assembled from various parts.
    The column base I bought 10 years ago on fly market and till now
    was waiting for this project under my bench.
    Guy who sold it asked 200 EUR for column + digital DRO /lot of money here/ but I could not resist such opportunity so with " my heavy heart " I paid.
    Two weeks before Xmas i saw on EBAY 2 axes worktable for 50 EUR
    so I have ordered it .
    3 days later a parcel service rang my doorbell .

    2 axes table is built from aluminium precise profile but to tune this table took me two days /new bearings + some amending /.
    I know aluminium cross table "horrible" but for simple works it is acceptable.

    For the spindle I have used RC 200W - 3 phase motor ,50A RC speed controller and servo tester to regulate controller /all from my old crashed air plane/.

    Dividing table is built from scratch material plus plastic protractor attached to the outer table rim.

    Coffee mug is just for dimension comparison .
    Pictures show more.

    I wish you happy new year and minimally one running engine in 2018.

    2017-12-28-2625.jpg

    2017-12-28-2626.jpg
     
    Last edited: Dec 28, 2017
  2. Dec 28, 2017 #2

    kuhncw

    kuhncw

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    You did a very nice job building the small mill-drill. It looks good.

    Aluminum should work ok.

    Chuck
     
  3. Dec 28, 2017 #3

    Herbiev

    Herbiev

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    Very neat setup. Thanks for sharing
     
  4. Dec 29, 2017 #4

    Wizard69

    Wizard69

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    Nice work!
     
  5. Dec 29, 2017 #5

    ODgreenK5

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    Very nice small mill.
     
  6. Dec 30, 2017 #6

    petertha

    petertha

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    Very cool. When you say 'spindle' I assume black color = motor body & blue color = spindle body? If so, can you elaborate on bearings & layout in there? What kind of RPM can you run? What kind of collet/shaft did you select? What kind of power supply feeds the ESC?

    SNAG-12-30-2017 0000.jpg
     
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  7. Dec 30, 2017 #7

    rlukens

    rlukens

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    Nice piece. I especially like the creative "rotary table".
     
  8. Dec 31, 2017 #8

    kadora

    kadora

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    Thank you friends.
    petertha
    I have this lay out.
    The blue is 3 phase 2100 rpm/200W inrunner motor , ball bearings , shaft
    DIA 3.17 mm.
    In black tube is accomodated 3 phase ESC 50A and servo tester
    to control ESC /home made with 555 timer/.
    I feed it with LiPol 3 cells battery pack.
    I am waiting for better chuck and 2 mm and 3mm mill bits now .
    If this set up will be solid enough for simple millimg with 2-3 mm
    bits i would be happy.
    + rotary table picture.

    2017-12-31-2628[1].jpg
     
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  9. Dec 31, 2017 #9

    petertha

    petertha

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    Ah, I get it now, thanks

    Only thing I wonder - how long the typical bearings in RC motors can withstand axial load? I fiddled around with Flight Calc different motors & calculated thrust by adjusting propeller pitch/dia.
    http://www.castlecreations.com/flight-calcs

    Mind you this is maximum (static thrust) so airplane models don't typically see this full time. I guess if you peck drill or not mill/drill for a long duration it will help to not load & overheat the bearings. But these motors are a nice way to get high rpm & low run out for small drills providing the chuck/collet is also accurate.
     
  10. Jan 1, 2018 #10

    Wizard69

    Wizard69

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    Interesting! I have thought from time to time to build up a miniature machine shop to travel with if i ever make it to retirement. In that regard was actually thinking solar power but obviously battery storage would be required.
    The mechanics should handle that easily, probably even larger mills if you could up the power a bit.

    Again one sweet looking mini mill. Now all you need is a lathe to go with it.
     
  11. Jan 1, 2018 #11

    kadora

    kadora

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    petertha
    - how long the typical bearings in RC motors can withstand axial load?
    I really do not know - time will show me.
    I drilled a watch dial for roughly 15 minutes and motor was warm
    only of course milling stress motor bearings much more.
    Wizard69
    Excellent idea to have a movable machine shop./did not think about such possibility/.
    I have little holiday chalet in nearby woods no electricity there
    maybe some hobby work in fresh air ?
    thank you guys.
     
  12. Jan 1, 2018 #12

    mechman48

    mechman48

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    Well done Kadora, nicely put together
     
  13. Jan 12, 2018 #13

    kadora

    kadora

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    Hello
    I have attached to the X table carbon fiber DRO rebuilt from cheap
    200 mm vernier caliper .
    Unfortunately DRO has 0.1 mm accuracy but together with wheel dial
    I will try to learn more exact reading .
    Carbon fiber is easy to drill and mill.

    2018-01-12-2661.jpg
     

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