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  1. #13
    Registered wireb's Avatar
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    Quote Originally Posted by RomanLini View Post
    That's a nice looking build for something you called "junk".

    Are you going to add any triangulation within that large box column that makes up the rear of the machine? It may not flex much but if machining something hard (like aluminium) the column may act a bit like a tuning fork. Can your CAD program tell you what the resonant frequency of the uprights will be? It might be worth checking.
    Did a quick check on the one assembled upright. If I stand on where the table mounts and press really hard at the very top of the upright I can get the top to deflect .010 to .015". Once I get the other upright assembled and cross stitched will try it again. Guessing under normal force of PCB milling this thing will not move at all. On bigger bits / cuts It may move 5 to 10 thousandths but under roughing cuts will not make much of a difference.

    Nice part is I can always add cross braces when needed



  2. #14
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    Finished welding the primary frame today. Now need to hunt down a machine shop that can skim cut the mounting locations for me.

    Attached Thumbnails Attached Thumbnails junkbox 18x7x7-img_0106-jpg   junkbox 18x7x7-img_0115-jpg   junkbox 18x7x7-img_0116-jpg   junkbox 18x7x7-img_0121-jpg  

    junkbox 18x7x7-img_0122-jpg   junkbox 18x7x7-img_0123-jpg  


  3. #15
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    It's looking good!

    I'm still a bit worried about resonance, a few thou flex that happens to be timed at the same freq as your cutting tool will cause problems. The good news is that you can very easily weld 4 plates on the outside of that column to box it in and dramatically stiffen it up.



  4. #16
    Registered wireb's Avatar
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    Made some more progress today. Frame is out at a machine shop getting the 2 surfaces skim cut flat and square to each other. Stopped by the local mattress store and picked up some old bed frames and made a stand. Tomorrows plan is to pick up some 3/4" MDF for the top and sides of the frame (PC and other electronics are going under it) and some leveling feet.

    Attached Thumbnails Attached Thumbnails junkbox 18x7x7-img_0126-jpg   junkbox 18x7x7-img_0134-jpg   junkbox 18x7x7-scrap_cnc_mill-jpg  


  5. #17
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    That thing looks great! Very nice work so far.

    I'm with Roman on this one however, I would just add some bracing to the column. For what it will cost you and how little work it will be, you may as well just do it now.



  6. #18
    Registered wireb's Avatar
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    If I come by some plate I will add some. But for now I am just going to try it as is. Don't expect much issues with the size and speed I will be using.

    Well got the sides cut out and the reliefs for the welds. So now putting 3 coats of poly on all the sides. Also a shot of the nice shiny machined surfaces with pins

    Attached Thumbnails Attached Thumbnails junkbox 18x7x7-img_0135-jpg   junkbox 18x7x7-img_0139-jpg   junkbox 18x7x7-img_0140-jpg  


  7. #19
    Registered wireb's Avatar
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    Well got the stand built and 2 to 4 coats of 2 part urethane paint on the frame. Any luck should be able to start assembling stuff next week.

    Attached Thumbnails Attached Thumbnails junkbox 18x7x7-img_0145-jpg   junkbox 18x7x7-img_0146-jpg   junkbox 18x7x7-img_0147-jpg   junkbox 18x7x7-img_0152-jpg  

    junkbox 18x7x7-img_0158-jpg   junkbox 18x7x7-img_0159-jpg   junkbox 18x7x7-img_0162-jpg   junkbox 18x7x7-img_0163-jpg  

    junkbox 18x7x7-img_0165-jpg  


  8. #20
    Registered wireb's Avatar
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    Got it mounted to the table and machine surfaces waxed tonight. Also started to square in the X but need to pick up some shim stock before I crank the table home. (pin is ~0.086" off)

    Attached Thumbnails Attached Thumbnails junkbox 18x7x7-img_0166-jpg   junkbox 18x7x7-img_0170-jpg   junkbox 18x7x7-img_0171-jpg   junkbox 18x7x7-img_0172-jpg  



  9. #21
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    Well not much progress this week. Got the shim stock and did a final mounting of the X axis. Spent most of today working on the X sensor selection and bracket. Got some of these on the way for the sensors.
    Digi-Key - 480-1941-ND (Manufacturer - HOA2004-001)

    They should be here early next week. Will start cutting the bracket out tomorrow to prepare for them.

    Attached Thumbnails Attached Thumbnails junkbox 18x7x7-img_0173-jpg   junkbox 18x7x7-img_0174-jpg   junkbox 18x7x7-img_0175-jpg  


  10. #22
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    That's shaping up nicely.

    It's going to be an attractive and original machine when finished.



  11. #23
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    Thanks! that's the hope Long as it works when it's done I think I will be happy (until that project that needs just a 1" longer of travel to complete)



  12. #24
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    Well little late but last weekend I got my limit switches for the X axis made up and mounted. Also picked up a old PC from a friend to use as the controller. Good chance this weekend I could get the X axis driver tuned and finish the X assembly.

    Attached Thumbnails Attached Thumbnails junkbox 18x7x7-img_0180-jpg   junkbox 18x7x7-img_0181-jpg   junkbox 18x7x7-img_0183-jpg   junkbox 18x7x7-img_0185-jpg  

    junkbox 18x7x7-img_0186-jpg   junkbox 18x7x7-img_0189-jpg  


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