On Friday 11 May 2018 18:32:44 Gregg Eshelman via Emc-users wrote: > An idea for putting a square hole at the end of a round one, without > having to use special tooling. Mill brass bar stock into a pair of > small L shapes, with one leg just as long as the width of the tap > shank.Position the two pieces to make a square hole then silver solder > together. Cut off excess leg length. Turn the outside of that assembly > round, and smaller than the OD of your tap hat.Counterbore the top of > the tap hat to fit the square hole piece then silver solder together. > If the L parts could be held together for the turning, the assembly > could be silver soldered in one step > > If you're making these with through holes, you could make custom sized > square broaches to push through. > I measured several earlier today, and it appears the shank sizes vary in nominally 25 thou increments. So at that rate, I'd have to make 10 or more of those broaches. I'll pass and use grubscrews I think. But I didn't make any actual swarf today, other things got in the way.
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