Posted by daveyKin Pa [108.36.138.127] on Wednesday, August 05, 2015 at 11:13:06 :
In Reply to: Drill Bits OT posted by The Dodge Boys [173.49.177.213] on Wednesday, August 05, 2015 at 10:39:35 :
Hello Bill,
I use high speed steel, titanium, & cobalt bits.
some work better for certain bolts and sometimes I switch from high speed steel to titanium like on broken manifold bolts as they usually get hardened the closer I get to the metal of the head. Heat hardened I guess.
Never had much luck with cutting oils for the rusted stuff.
Try a variable speed drill and lower RPMs will keep the bit cooler and will not dull the cutting edge as quickly.
I also keep sharpening the bits on a grinder to keep the cutting edge sharp.
HTH
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