My approach is normally slow and gentle. I'm no expert though. Beware colbalt bits are more brittle than normal bits. I've broken a few drilling out 10.9 grade bolts.
On the Repair shop, to drill a hole in a clock spring , Steve heated it to take the temper out, then drilled as normal.
Guess you might need the temper?
Yes it's a drag tine I can't get the right length I need so bought the shortest I could get still need to shorten them and drill two 10mm holes in them any tips and ideas greatly appreciated
I don't know if I've ever done it to spring steel, but a carbide masonry bit can be sharpened just a little sharper on a grinder, then it will wear it's way through any steel I've tried. Slow and moderate pressure. No lube.
A cobalt bit with lube will be much quicker and cleaner if it will cut. I don't know how long it would last if you anneal that spot.
Have you got a mag drill? there is a 10mm cobalt broaching cutter available i think, not cheap tho so you would hope to use it for more than 2 holes i guess.
in this situation what I do is get a couple of masonry bits and regrind them to steel bit profile and keep them cool as the tungsten tip is only brazed on. The same applies to the drilling process plenty of waterbased drill oil. I have drilled bearing with these drills.....................................................................................................
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