Mud
Well-known member
I occasionally use S&D HSS drills for simple jobs in manual machines. Needed a 19/32 yesterday in aluminum. I had one but it had a corner knocked off. I suck at hand sharpening, never really tried to get good at it. I generally send them out to a service because it's so cheap and they come back so nice but I only have one of most of these over 1/2" and don't have spares to send out. So I cleaned up the ancient Darex rig and repointed this drill to drill the one hole. I made it 135° and it worked fine opening up a 1/2" hole, was .0015 over nominal. It was already 135 so I must have ground it previously. None of these need to be split point, they will always have pilot holes, either in steel or aluminum.
I also question what angle I should ask for when having them ground. I have HSS drills here up to 2+" that occasionally see use in repair or oneoffs.
What would you specify? Does it make a difference in this application?
I also question what angle I should ask for when having them ground. I have HSS drills here up to 2+" that occasionally see use in repair or oneoffs.
What would you specify? Does it make a difference in this application?