IRWIN Countersink Drill Bit Set for Metal, 5-Piece (1877793)
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They've been in my possession for a long time. They're still sharp after drilling wood and steel. I've never had a problem with it slipping, but I believe the problem is due to the quality of your drill. So long as your drill has a solid chuck, you're good to go.
Stainless steel is a tough metal that requires carbide or possibly cobalt for tooling.br>It is also expensive to buy and tool.
Yes. It is a two-step process for a different type of product. br>1) Drill a hole, then 2) countersink a spot for the screw head with this. br>I have a similar one, but it isn't an Irwin, so I can't comment on quality, but the style seems to work fine; however, I noticed that you can make it "wander" a little, so if you're trying to line up holes, the other style might be a better choice.
There is a distinction between those that can be used for metal and those that can be used for wood.
Selected User Reviews For IRWIN Countersink Drill Bit Set for Metal, 5-Piece (1877793)
Even with everything securely clamped, Magic Tap lubricated, and slow, even pressure on my drill press, I couldn't get a clean countersink in carbon steel or soft brass. Very let down.
They were purchased for the purpose of making wood countersinks. They are completely unsuccessful in this area. They judder and shake so much in any wood at any speed that they make a hexagon-shaped countersink. It's completely pointless. br>br>In addition, they are packaged in an ineffective case. They need a screwdriver to pry them out of the case because they are so tight. Then, when you try to put them back, it takes so much effort that you give up and throw the case away. br>br>If you're going to use it on wood, you should get the KEO 53512. It is more expensive, but it is superior in every way.
Up front, there are five stars. They have a good amount of abrasion resistance. They'll grab and spin in the chuck if you put too much pressure on them. It's a little chatty, but it's perfect for my purposes. On a work table with a quarter-inch mild steel top, I'm just countersinking some 3/8" flat head bolts.
Work clamped down, lubricated, but still chattery, leaving washboard around the bevel in a drill press.
in the most appropriate software It works well in a variable hand drill, which is unsurprising, but not so well in a drill press. That surprised me, and I think it's because I had a speed set for the countersink that was too fast for the drill bit I just used, but not for the countersink. The issue is that, with all of the pulleys and such, changing speeds on most drill presses is a pain. As a result, I switched to a variable-speed hand drill. Slower speeds seem to work best, and don't be fooled by some of the videos that claim that cutting these bits in reverse gives you a clean cut. That is not the case.
I've had these for a couple of weeks and they're fine for the price; however, they did require a sharpening out of the box (holes began to look hexagonal). But after a quick sharpening, they're as good as new. Plywood, softwood, and hardwood were all used to test them. Metals are something I've yet to try. If you don't want to spend a lot of money, this is the perfect option.
I keep one loaded in one of my drills while using my drill bit in the other, and this thing chews through soft or hard wood like a champ! It creates a beautiful countersink that is very nice and smooth. I've put them through their paces and they're still sharp and going strong!.
On the slowest speed setting on your drill, these work great for mild steel, but not so much for stainless steel.
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