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jratcli256(at)aol.com
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 Posted: Fri Apr 28, 2006 5:54 am Post subject: Drilling hard material (Crankshaft Bolts) |
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Larry,
I believe the drill bits being refered to are carbide bits.
The proper bit works great. Use a machinists bit. They are generally short (because they are very brittle). Don't use the ones with carbide tips braised on (Masonry type bits) They are alot cheaper but if you break them off in the hole you've got a big problem. They are also not very accurate in size.
They work best in a drill press or milling machine because you have better control of side loading and pressure (especially when breaking through the material at the end of the hole).
Remember no side load if possible and just enough pressure to keep it cutting. Don't let the bit catch as it breaks thru. Lighten the pressure. Carbides can be run at higher speeds then high speed bits which helps at the break thru point.
Also these bits are good for drilling thru material that has been heat hardened as in welding near-by or heated for bending.
Hope this helps.
John Ratcliffe jratcli256(at)aol.com
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biglar
Joined: 14 Jan 2006
Posts: 457
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| Posted: Fri Apr 28, 2006 2:49 pm Post subject: Drilling hard material (Crankshaft Bolts) |
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Thanks, John. I think you're right, but I don't want to fool with it
anymore, and even if I did get it drilled, how would I cut threads in it for
the slide hammer ?? Filling it with heavy oil and using a punch sounds
interesting, and seems like it should work, assuming I could get a
horizontal hole completely filled........but what if it didn't ?? As you
say, breaking a bit or tap in there is very possible - even probable - and
then I'd REally have a problem. The welder will be here at 10:00 AM
tomorrow, and we'll get the fool thing out and move on.
Lar. Do not Archive.
Larry Bourne
Palm Springs, CA
Building Kolb Mk III
N78LB Vamoose
www.gogittum.com
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Larry Bourne
Palm Springs, CA
Building Kolb Mk IIIC
"Vamoose" |
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