"RoyJ" wrote in message
...
Hope someone can settle an argument: The part is a 1" long x 3/8" OD x
3/16" ID brass bushing that needs a 6-32 set screw. Tap drill goes all the
way through both walls for convenience. Hand tap with straight flute
tapered tap and 'T' handle. Quick prototype level part, only making 2 of
them, precision not required.

Questions: tap dry or use what lubricant? Backup the usual 1/3 turn to
break the chip necessary on this part?

No lubricant, no backup (provided your alloy doesn't produce curly
shavings - most don't).

Piece of cake.

--
Jeff R.