best name brand spot drill for 303 ss

[superdave8831]

wondering what you guys use for 303 stainless. we are using megafor and hertel and not having any luck. we mainly do aluminum so we havnt had a issue before. thanks in advance

[Mic6]

I run Guhring carbide 145° in everything. Still going strong. AL, SS, Ti

[jeff]

what issues are you having? Have you tried sending the spot drill out to get coated? that might solve all your problems.

[superdave8831]

mostly we use 90 deg, because thats mainly what our parts call for, and jeff i will try that thanks

[workmantm]

Try running 135° or 140° split point carbide drills and following that up with a 4flt 90° chamfer mill. It's how I've been handling holes with 90° chamfers for a few years now. The split point all drill within .0005/.001 of diameter with no walking or issues on getting straigh holes so far. mostly 15-5, 17-4, 304 Cond B, 4340, 4130. Accupro has been my line of choice, but if you can get a better deal they are the exact same drills as the Melin Job Shop line...... a little birdie forgot to clean up a PDF I downloaded for S&F on the tools. Traced it back just fine after that. Now they have scrubbed all traces from their website.