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IndustryArena Forum > MetalWorking Machines > Mikinimech > Where can I find a new drawbar?
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  1. #1
    Join Date
    Aug 2010
    Posts
    599

    Where can I find a new drawbar?

    The threads have finally stripped on mine and now I can't hold some of my tools.
    warmachinellc.com

  2. #2
    Join Date
    Jul 2006
    Posts
    367

    Re: Where can I find a new drawbar?

    I make my own. I'll post some info later tonight
    pete

  3. #3
    Join Date
    Aug 2010
    Posts
    599

    Re: Where can I find a new drawbar?

    Quote Originally Posted by slowtwitch View Post
    I make my own. I'll post some info later tonight
    That's what I figured. Do you make from scratch and from what material?
    warmachinellc.com

  4. #4
    Join Date
    Jul 2006
    Posts
    367

    Re: Where can I find a new drawbar?

    I buy grade 8 bolts (7/16x20) from Mcmaster (part # 91257A487). Look at the pdf, (don't mind the bad pdf drawing, I'm a rank beginner at this cad stuff), but it will give you an idea of how I made mine. The hex is 5/8" 4140 , also from Mcmaster.

    The intermediate part is made from some round stock I have laying around. I turned it to act as a guide for the hole at the top of the spindle nd to help in releasing the collets.

    In my situation, using my power drawbar thing, I hardened the Hex portion and use two roll pins to hold it in place (the pdf does not show the holes on the end of the bolt) . The harding really helps with using a power drawbar.

    All the sizes are approximate (I'm at work and I just winged this from the top of my head
    pete

  5. #5
    Join Date
    Aug 2010
    Posts
    599

    Re: Where can I find a new drawbar?

    Thanks Pete,
    I ended up having a friend make pretty much an identical copy on his lathe. Once I got it I realized it needed a minor diameter tweak and rather than send it back and since I don't have a lathe I did it on the machine using it as a vertical lathe.
    Click image for larger version. 

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    warmachinellc.com

  6. #6
    Join Date
    Aug 2010
    Posts
    599

    Re: Where can I find a new drawbar?

    I machined the hex today and opted for a 3/4" drive to match my vise, I then heat treated it with a MAPP gas torch and used motor oil. I'm now tempering it at 350F for an hour. This one is made from 1215 steel but next time I'll use 4140.
    Attachment 288366
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    Click image for larger version. 

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    warmachinellc.com

  7. #7
    Join Date
    Jul 2006
    Posts
    367

    Re: Where can I find a new drawbar?

    Nice job, Jim !!!!
    pete

  8. #8
    Join Date
    Apr 2005
    Posts
    1268

    Re: Where can I find a new drawbar?

    That turned out nice!
    Bill
    billyjack
    Helicopter def. = Bunch of spare parts flying in close formation! USAF 1974 ;>)

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