2007-09-24 20:40:25 · 4 answers · asked by manasa n 1 in Science & Mathematics ➔ Engineering
Tools are usually made of hardened steel; its very hard to drill regardless of noise created. You can try using high speed cobalt, (HSCO) solid carbide drills coated with TiN or TiAlN or Guhring SL carbide Firex coated (claimed to cut up to 90 HRC!) also, you might be able to get a special drill bit with diamond grit brazed onto a steel core. All of these will need cooling and considerable force to do the job. If it really has to happen without any noise, it will be even more difficult, as you're probably going to have to drill by hand.
If you could tell more about exactly what you are trying to accomplish, people might be able to offer better solutions.
2007-09-24 21:02:35 · answer #1 · answered by Flying Dragon 7 · 0⤊ 0⤋
If the steel is really hard say 70 to 90 Rockwell C then you will need an expensive carbide bit. If it is not file hard then a cobalt bit is a great choice. Carbide bits will break or chip if not held in a sturdy drill press or milling machine. You might try spot annealing the surface you are drilling if it is very hard then any drill bit will do it. You can take a one inch cube of steel and heat it almost white hot and put one corner on the spot you wish to drill until it cools down. Good Luck
2016-05-18 00:07:53 · answer #2 · answered by marilee 3 · 0⤊ 0⤋
what do you mean by "silently", are you trying to avoid the horrible squealing you can get when drilling hardened steel with a carbide die drill? if so, try experimenting with speed and feed, and consider wearing hearing protection. EDM might be relatively quiet, but not silent, and can be relativly slow.
2007-09-24 21:36:17 · answer #3 · answered by tinkertailorcandlestickmaker 7 · 0⤊ 0⤋
Why do u need them are u a peeking tom lol.
2007-09-24 20:45:17 · answer #4 · answered by Anonymous · 1⤊ 0⤋