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Posted on How do you identify good steel from bad in tools like drill bits

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3259 posts in 2703 days

#1 posted 12-15-2012 04:15 AM

gfadvm is giving good advice on spped and drills. If a drill is running the correct speed and it is sharp, it will cut and you should see longer pieces of metal coming from the drilled hole. If you see dust or very small fragments then you are usually running at a high speed or you need to sharpen the drill. With that said you have to run smaller diameter drills at a little faster speed than the larger diameter. The larger drill goes further (outside diameter) than the smaller drill in a revolution. I have found that good drills are sometimes a shot in the dark, especially on the least expensive end. I bought a Harbor freight set about 25 years ago and I still use them. They were pretty good. I have bought other lower end drills that were nopt so good. They a known brand on them too. Usually more expensive means they should be better but… can be a shot in the dark there too.

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