Thanks Paul,
It's my good friend Bob Strawn who actually showed here how he drilled HSS with a concrete drill bit. as I had one of these glass carbide bits, I gave it a try. The cutting edge is better than a concrete bit, though it may be more fragile. But with lubricant and not too fast speed, it did the job.
Cheers !
Christophe
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PJs (Oct 1, 2015)
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