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gah, stupid chinese milling machine

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  • gah, stupid chinese milling machine

    my milling machine drawbar is stripped. i've tried to be super-cautious about it because i knew it looked cheap and soft, but i guess i have failed.

    anybody know where i can get a normal R8 drawbar with about 16.5" under the head of the bolt?
    -paul

  • #2
    i think i may as well make up a new one. what kinda material should i use and should i harden the threads or anything?
    -paul

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    • #3
      I know a person can get B7 ( Hardened ) allthread that may work
      Walt

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      • #4
        weld a grade 8 bolt on the end and call it good,we have one thats been working for 3 years that way.

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        • #5
          You could look on this as a safety feature,strip the drawbolt rather than the thread in your collet holder?i use a galvanised bolt for a drawbar,this is really soft,and also cheap .after 2 years use i have no complaints.FYI,the original wasn't stripped,just too short with the collet set and a morse3-4 adaptor.

          ------------------
          Hans
          Hans

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          • #6
            I would go with the all thread or welding a grade 8 bolt on,either one will work good and it gives you a rolled thread which will wear longer.
            The drawbars on the market are all crap IHMO,I have bought them from all the usual suspects,they all are too soft or two-piece and pinned together.
            I just need one more tool,just one!

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            • #7
              I have a made in chine mill also,And what would be the frist thing to go ? the drawbar,what i did to fix my problem,was make one out of cold roll and case hardened it,has be working for a long time now.....lol
              les

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              • #8
                the dude who sold it to me is sending me a new one, but i'm going to be picking up a 7/16-20 grade 8 bolt tomorrow and welding that sucker on the end i guess...
                -paul

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                • #9
                  Why not use high strength loctite? There's not much sense welding a gr 8 bolt on, if you are going to weld use grade 5 or whatever.

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                  • #10
                    <font face="Verdana, Arial" size="2">Originally posted by jim davies:
                    Why not use high strength loctite? There's not much sense welding a gr 8 bolt on, if you are going to weld use grade 5 or whatever. </font>
                    how come? i figure if i weld a grade 8 bolt on the end, the tip where the threads matter will still be harder than a grade 5, therefore they'll be less susceptible to stripping. i dunno...
                    -paul

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