On Sep 26, 11:11*pm, Richard J Kinch wrote:
Ignoramus24898 writes:

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.

How frequently do you break taps? *If you're not an utterly reliable
tapper, you'll never be able to complete this job.

So, make threaded inserts of steel, for oversized holes (stepped would
be good) with a bit of loctite. The accuracy of a screw position
isn't
critical, I trust.

Of course, to churn out inserts might require a CNC lathe... or a
turret lathe.