Drill bits with countersink recommendation?

[Xaiy]

OK, I have a set from...somewhere. The problem is, the countersink packs with wood material after about 4 holes. This requires stopping and cleaning out the countersink. I'm drilling numerous holes and need something that can clear the wood particles from countersink.

I found Carbide Countersink Drills with Low-Friction Depth Stop from Lee Valley and was wondering if this product would work for what I'm trying to do - drilling a lot of holes without having to stop and clean out the countersink. Oh, I want one bit to do the job, I don't want to have to change the bit to make the countersink.

If not, any other recommendation?

Thanks.

[jpanhalt]

Have you tried compressed air to clean the bit while its running?

[Yansi]

Haha, guessing someone was watching Keith Rucker lately, wasn't he? 

[duak]

I do a bit of work on multi bit CNC drilling machines.  These things can easily pack up with chips or saw dust if something is off.  It's often due to the natural resins or binders in the wood melting and then building up on the bit.  Anything you can do to reduce temperature is good.  Maybe drill slower and let the bit cut more rather than wear its way thru.

Twist drills aren't the best geometry for wood - it's better to go to brad point boring bits.  Here's an example for a high volume machine: https://www.amanatool.com/products/boring-drilling-bits/brad-point-boring-bits.html  If the countersink you have is a collar, you should be able to find a brad point bit to replace the twist drill.  It probably won't have the reduced diameter the boring bit has.

Compressed Air is good - most CNC wood drilling machines have some sort of air blast.  Even a vacuum nozzle helps because it takes away debris so there isn't recutting and it can provide some cooling air.

If there isn't too much build up, DriCote can help: https://www.rockler.com/bostik-dricote-aerosol-spray   If you can get silicone grease or other lube, it can delay buildup.  Silicone is nice because it usually sticks well to metal, but nothing sticks to it.  Dino based lubes can work too if you can't get silicone.

A small metal welder's brush can be used to clean the bit before it gets too bad: https://www.usaweld.com/Stainless-Steel-Wire-Brush-p/wirebrushes.htm  These things are about the size of tooth brushes and usually have twisted wire bristles.  Mineral spirits or turpentine is a good cleaner.  After cleaning, put on the lube.

Best o' luck,

[eKretz]

If you're talking about the countersinks that are commonly clamped to a pilot drill for wood screws, those always clog, no matter the brand. It's relatively easy to clear them though,  just run the drill in reverse and lightly pinch your fingers on the OD of the countersink. The clogged sawdust will pop right out.

[jhenderson0107]

Fuller bits work perfectly and I’ve never encountered any clogging in 1000s of holes.