03-01-2016, 09:54 AM
(This post was last modified: 03-01-2016, 09:55 AM by Sunset Machine.)
Where did I see someone wrapping his part with iron wire and slathering a pasty solution of boric acid and alcohol on it for protection. Boric acid as used in silver soldering/brazing. Looked good to me, a fairly hard coating. Stuff steel wool in the hole.
and... how hard? Is machinable 4140HT hard enough?
and.. round the corners of a 5/16" (.313) drill bit and try that as a reamer.
That's what I do here. A radius similar to the rounded tip of a lathe bit.
Maybe stone the sides (flutes) to get that closer to .311
and... how hard? Is machinable 4140HT hard enough?
and.. round the corners of a 5/16" (.313) drill bit and try that as a reamer.
That's what I do here. A radius similar to the rounded tip of a lathe bit.
Maybe stone the sides (flutes) to get that closer to .311