help choosing counterbore for titanium

Z

zealot

Joined
Jun 17, 2006
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Hi, I need suggestions for what counter bore type I need. titanium destryed my HS steel one even at slow speed and with cutting fluid. help!:confused:
 
how slow is your slowest speed? even with carbide you'll still want to spin pretty slow. 100-200 rpm would be a good starting point.
 
Really do need carbide for Ti, and ti needs a slow speed, and aggressive feed (pressure).

McMaster has carbide tipped counterbores in a good size selection for "reasonable" prices, which are high regardless. However, a carbide tipped counterbore used correctly should last a very long time. They've got reduced shank sized with interchangeable pilots also, which is nice if you're looking for one to do bearing pockets. If it's for screws, you may want to check with Bob Ohlemann (rangerbob I think is his username) he had some made recently for 2-56 button heads I think.
 
oh wow, ok my press is like 680 at the slowest. have to check my mini mill, it might go slower not sure. So I will look at carbide tipped. I need these for bearings and pivots
thanks for the quick replies!
 
That should be sufficiently slow for carbide, but definitely pretty fast for a 13/32 hss counterbore or larger, especially since I'm guessing this is your typical crappy modern drill press (no offense) with lots of rigidity and chatter issues.
 
I've been using a hss #4 counterbore from mcmaster on titanium for months now. I run it at around 180-200 rpms and light pressure.
 
ok cool, so I ordered the carbide. we'll see how it works out. thanks everybody -Triple Deuces Knives
 
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