digiex-chris
Well-Known Member
- Joined
- Dec 6, 2010
- Messages
- 263
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I've got a fairly old but sturdy drill press. I do a lot of drilling for #8 taps, so I'm using the #29 drill a lot. I break drills that size all the time, even sharp new ones. Seems like every time I look at one of those drills, I snap it off in a hole. Thankfully most of the time I can get it out of the hole.
It seems to be breaking where it breaks through the hole, so it's grabbing coming out. On a drill that size I've got no feel on the drill press handle so I can't let up as it's coming out of the hole. Still, I'm breaking so many bits I'm suspecting either there's something majorly wrong with the drill press or it's setup, or my technique needs some major help. It was less rocket surgery to cut my valve seats than to drill 10 #29 holes! I need to buy #29's by the 100 pack to be happy! It's the only operation in my shop that reliably makes me swear. So far I've only been working on rebuilding a small commercial engine, I don't want to start destroying my own home built until I get this figured out.
Any tips? Any advice for looking into what might be wrong with the machine? Any technique tips? #29 is way bigger than some of the holes I've seen worked with here!
p.s. I drill this size and smaller on the lathe all day long without wearing out or breaking a bit. That little taig has way better feel though. I'm sure much better alignment too.
It seems to be breaking where it breaks through the hole, so it's grabbing coming out. On a drill that size I've got no feel on the drill press handle so I can't let up as it's coming out of the hole. Still, I'm breaking so many bits I'm suspecting either there's something majorly wrong with the drill press or it's setup, or my technique needs some major help. It was less rocket surgery to cut my valve seats than to drill 10 #29 holes! I need to buy #29's by the 100 pack to be happy! It's the only operation in my shop that reliably makes me swear. So far I've only been working on rebuilding a small commercial engine, I don't want to start destroying my own home built until I get this figured out.
Any tips? Any advice for looking into what might be wrong with the machine? Any technique tips? #29 is way bigger than some of the holes I've seen worked with here!
p.s. I drill this size and smaller on the lathe all day long without wearing out or breaking a bit. That little taig has way better feel though. I'm sure much better alignment too.