Luger barrel question

[sheepherder]

Originally Posted by G.T.

Hi Rich, I dunno?? I just know it takes a lot to push something bigger thru something smaller... .... most of my experiences ended with stuck like welded results! I though one might mount a threaded fixture in a large, mostly linier thrust bearing, and let it, the barrel, turn as the button goes thru! ..... I have been eyeing the button for sale on ebay.... Project number 9999! .... best to all,til...lat'r....GT....

Gerry, my only experience in this area has been in cutting keyway slots in gears and pulleys. We used the appropriate width broach and an assortment of shims. The 'press' used a gear driven ram, with a long handle, for pushing the broach through. Use lots of oil, and if hard resistance is felt, a pipe on the handle. A half-inch keyway would require a quarter-inch deep cut in the gear/pulley. The shims were any convenient thickness; in this case, probably 1/32" or 1/16". Press the broach through and stack another shim, oil, and press through again. Broaches were ~18" long IIRC.

A rifling groove of only .004"-.005" would be easy. Making a 'rotating nut' with a twist of 1 in 10" might require some thought...