Quote:
Originally Posted by zman007007
you could also grind a little flat spot where it needs to go and then center punch it.
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I did center punch but didn't grind a spot on it. Probably would have prevented the punch from shifting across the metal. Thanks, hopefully I don't have to do this again for a while.
I've read up a bit on using masonry bits for hardened steel. The carbide tips have a drill type head to them but it's an inefficient grind angle on the tip. If ground more like a metal cutting bit the carbide bit will cut and not scrape a hole. Either way it goes the masonry bit is NOT the way to go IF accuracy is paramount. However, a cotter pin hole is okay. Now, what someone needs to tell us is how do we get what angle with a Drill Doctor because I don't have the skills to sharpen a drill properly by hand.