[CAUT] pinblock material, drilling speed, feed rate ?

[Ron Nossaman]

On 1/30/2011 9:39 PM, Dr. Henry Nicolaides wrote:
> I'll try slowing down to aproximate that speed and drill a few test
> holes...perhaps 1250 rpm was too fast. It's been awhile since I drilled
> delignit. I think the last one I drilled I made two passes...first with
> a smaller bit and half way into the block and then with the normal bit.
> BTW, do you use a brad point or sprial bit?

Go back to two passes. Drill the first hole, *all the way through*, 
something like 0.015"-0.02" smaller than your finish size. Then do the 
second pass with the finish size - regular jobbers bit. Throw away the 
high helix. You'll get a more uniform result with less trouble than 
anything else you've ever tried.
Ron N