The Shop > Metal Stuff
Drilling holes in HSS
sparky961:
When I'm without a solid carbide drill bit that fits the bill, I've put holes in a few things using a hand-sharpened carbide-tipped masonry drill bit. They're easy to find and cheap. Have a look at the tip before you buy it and try to picture whether you can sharpen it or not. Some won't work as well as others.
Sharpen it using a silicon carbide or diamond wheel with minimal relief so it doesn't dig in too aggressively. You won't get anything resembling spiral chips, more like saw dust or just plain dust. If you're drilling through solid then maybe try to punch or nick a starting hole to keep the drill from walking. Drilling out an existing hole will probably be harder because it will want to chatter like crazy.
Clamp everything rigidly, turn slow, feed light, and keep it all cool.
If it doesn't work, you've only lots a few bucks (or pounds, euro, quid.... whatever). You may need more than one...
PekkaNF:
Whole lot also depends on HSS properties. I have used very hard high carbon drill to drill trough "import" HSS.
HSS is known to keep temper at higher temperature, not necessary hardness. Normal carbon steel can be sometimes harder, but it has to be kept cool, because if it heated over 160C it might loose temper and that is not very high rpm.
Problem is that often we really don't know the hardness to our tools...both can be from 30 over 60 Rockwell scale.
Halfway down:
https://en.wikipedia.org/wiki/High-speed_steel
Very likely your slitting saw is M2 HSS and it could have hardness to 62-64 I would attack it with tungsten carbide drill, most likely to succeed.
Pekka
mfletch:
Ive drilled through a HSS drill bit before and not through shank it was through the flutes just get yourself a locksmith drill bit there carbide on the end
mattinker:
--- Quote from: sparky961 on January 16, 2017, 04:38:45 PM ---When I'm without a solid carbide drill bit that fits the bill, I've put holes in a few things using a hand-sharpened carbide-tipped masonry drill bit. They're easy to find and cheap. Have a look at the tip before you buy it and try to picture whether you can sharpen it or not. Some won't work as well as others.
Sharpen it using a silicon carbide or diamond wheel with minimal relief so it doesn't dig in too aggressively. You won't get anything resembling spiral chips, more like saw dust or just plain dust. If you're drilling through solid then maybe try to punch or nick a starting hole to keep the drill from walking. Drilling out an existing hole will probably be harder because it will want to chatter like crazy.
Clamp everything rigidly, turn slow, feed light, and keep it all cool.
If it doesn't work, you've only lots a few bucks (or pounds, euro, quid.... whatever). You may need more than one...
--- End quote ---
I've had frequent sucess with this method very useful!
Regards, Matthew
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