Ignoramus24898 wrote:

I bought a couple of 3/4" thick aluminum fixture plates.

http://igor.chudov.com/tmp/Fixture-Plate.jpg

It was a local sale.

I would like to drill and tap them with 5/16" drill and 3/8" tap, say
spaced at 1" interval. That makes for about 200 holes to be drilled
and tapped on my CNC mill.

Some questions.


It is getting late but the threads I read so far didn't mention chamfering the hole before
tapping.

Link to one of our posters.

http://www.spaco.org/taptips.htm

See item #6

Good night,

Wes

PS Day 16 of my work week