How to drill titanium?

Joined
Jul 14, 2011
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I'm trying to drill a liner lock, and while I have been able to drill it in the past, it's always been a pain, and it takes me around 20-30 minutes for a single, 0.125 hole through .060 titanium. I'm pretty sure I'm not using the correct method. I'm using a cobalt tipped drill bit, and a hand drill, so that might be the problem. Any tips to drill through this? I can cut through D2, 1084 fine, but just not titanium.
 
1/8" through .060 should take ten or twenty seconds.

Titanium requires high feed pressure to drill. This is a good application for a 135 deg split point, which requires less force to penetrate. I like cobalt HSS for titanium. You need to lean into it pretty hard for it to cut, but you have to be ready to get off of it as soon as the web of the drill starts to exit or you'll over feed and wipe out the corners.

I don't drill titanium dry. It has a very low coefficient of thermal conductivity so the heat stays in the cut, which can cook a drill bit. I don't use oil because it smokes, but you can use it rather than water if you don't have coolant on hand.

I've never tried it with a hand drill. Good luck with that. :thumbup:
 
Nathan is right on.Ti will work harden if the bit just spins in the hole, if your not getting chips,your not feeding hard enough.
Stan
 
Pretty new bit doesn't quantify the quality of the bit in the first place. I had zero luck getting good holes with even the most expensive Lowes/HD bits from Dewalt, Irwin, whomever.

Look at the cutting face of the bit and see if the cutting edge is jagged. Most premium drill bits aren't intended for hand drilling anyway, and one cut on tool steel or titanium can ruin them, especially used in a hand drill.

As Nathan mentioned, split point bits are highly recommended for titanium, and I start my holes by center punching my mark and using combined drill and countersink. I've drilled a *TON* of 0.063 6al4v in the past few months. I highly recommend Drillco Nitro bits.

Cutting ti without coolant not only destroys bits, but can build up Alpha Case (which makes it harder to drill) and embrittle the Ti as it absorbs oxygen at elevated temperatures.

Here's a secret trick; Try drilling it submerged in water. Rigging a secure clamping method is the hard part, but especially since you're hand drilling, it could be a cheap and super effective way to keep the workpiece and your tooling cool. Just don't shock yourself.
 
I just googled the drillco nitro bits, couldn't really find anywhere to buy them. Found one place, $1 for the bit, but $9 for the shipping. Other places have pretty much the same thing. Cheap bit, but expensive shipping. Any stores I can buy bits from? Also, any suggestions for other bits? Currently using a RIDGID 1/8 in. Cobalt Drill Bit
 
Just buy cobalt screw machine length bits from Enco.

Google can almost always find a free shipping deal for $25 or $50.
 
Yeah those Rigid cobalt bits suck. I use them as beater bits when I need to use a hand drill, and am constantly angry at them. I need a mag drill.
 
Firm pressure and low speeds.I've drilled thousands of holes through ti.Coolant works great but firm pressure,low speeds,135 degree bits, cobalt or better.
 
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