On Mon, 9 Nov 2015 12:34:32 -0800 (PST), "
wrote:

On Monday, November 9, 2015 at 1:31:19 PM UTC-5, wrote:
Stainless steel drilling is testing so use a quality cobalt drill with a quality coolant and use the right drill speed, start small and work upwards. ive used ttp hard drills with success they also sell a desent coolant

DO NOT START SMALL AND WORK UP.

Stainless work hardens. If the final hole diameter is below about 1/2 inch , just pick that drill and drill aggressively. If the final hole diameter is bigger , then you might drill a small hole the diameter of the web on the final size drill, and then go to the final size drill.

Carpenter Tech has an on line book on machining stainless steel. Good info.
If you are into sharpening your own drills the book has info on the best angles for stainless.

Dan

Another tip, don't mark your spot with a center punch. It work
hardens exactly the spot where you're trying to drill.

Pete Keillor