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making bolts for head on mill?

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  • making bolts for head on mill?

    I need to replace the "head clamping bolts" on my mill. I have one original bolt (it is broken), the rest are home made. Previous owner cut off the heads of some regular bolts and welded on a piece of flat bar to get the needed square head.

    Looking for suggestion on material and how you folks would make the new bolts. Lagun get $24 a piece for the original bolts.
    John

  • #2
    If they are square head because they fit in a tee slot, they could be turned and threaded (and heads milled) from cold finished heat treated 4140. Also known as ASTM A193 B7. 3 feet of this from McMaster Carr will cost less than 40 bucks in the 1 1/2" dia. size.

    John

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    • #3
      If you need a square head, why not use setup studs and just make the heads as nuts (or buy them) and Loctite them on.

      Good quality setup studs are readily available in a variety of sizes and the Tee nuts may work for the heads. A little grinding may be needed to size them. Both of these should be as strong as a grade 5 bolt.

      Paul A.
      Paul A.
      SE Texas

      Make it fit.
      You can't win and there IS a penalty for trying!

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      • #4
        Not sure just what design you need, but MSC www.mscdirect.com and probably others sell bolts with T-nut heads. Also quite an assortment of other setup stuff that might be adapted. I'd explore Paul's idea, myself, before trying to carve a whole bolt from solid stock.

        ----------
        Try to make a living, not a killing. -- Utah Phillips
        Don't believe everything you know. -- Bumper sticker
        Everybody is ignorant, only on different subjects. -- Will Rogers
        There are lots of people who mistake their imagination for their memory. - Josh Billings
        Law of Logical Argument - Anything is possible if you don't know what you are talking about.
        Don't own anything you have to feed or paint. - Hood River Blackie

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        • #5
          Use heat treated 180 KSI square head T-slot bolts and modify the heads if you need to. You don't want mickey mouse poorly fitting bolts in this application. Bad bolts will mar the load face of the T slot.

          B-7 really isn't stout enough for this application wihout reheat-treatment. If you do make them don't allow any undercut in the head-body intersection. If anything leave at least a 1/32" radius.

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          • #6
            I may go the 4140 route. The problem with using a separate nut is the thickness. The heads are not very tall. so only a couple of threads would be engaged.
            John

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            • #7
              They make square head setup studs and they still make square head bolts,maybe look for them.
              I just need one more tool,just one!

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              • #8
                Thanks, I will check with a supplier next week and see what I can find.
                John

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                • #9
                  Forrest, I ordered the T-slot bolts that you suggested this morning. I figure I may need to modify one side of the tee to fit the circular slot.

                  And yes, it took nearly a year to get back to this project due a family emergency that came up that week.
                  John

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