Tile wheel, titanium vs carbide?

From what I see on various charts, tungsten carbide is harder than titanium nitrate (and metallic titanium). As to it holding up as a cutter, don't know which one may be less likely to shatter, but the tungsten one is harder.

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Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and and at Schluter Headquarters), Mapei Training , Laticrete Workshop , Custom Building Products Workshop , and Longtime Forum Participant.

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Between fabbing stuff 5-10 times a day for the trucks at work, and general use (drilling through firewalls, extracting stuck bolts, etc), I use my bits pretty much everyday. From my experience:<BR><BR>1. Cobalt is best, but a good HSS bit is fine if it's from a quality source. I bought a set of bits (1/16 -> 1/2 by 64ths) off one of the tool trucks at work. Ran ~$180 for the set, but the bits are warrantied for breakage, so as long as you keep them sharp it's a reasonable investment.<BR><BR>2. Keep them sharp. Most drill bits aren't as sharp as they could be, even out of the packaging. Learn how to use a bench grinder, or even better, a drill doctor (but get one of the higher end ones that will do split points).<BR><BR>3. Split points for metal is the way to go. Keeps the bit from wandering.<BR><BR>4. Use cutting fluid. It keeps the bit cool and prolongs the life of the bit. Heat kills bits.<BR><BR>5. Let the bit do the cutting, not pressure. Apply just enough presure for the bit to work, any more than that and you are dulling the cutting edge of the bit. It sounds simple, but most people don't do it.<BR><BR>Matt...

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