Drilling hardened steal????
#1
YES I KNOW I CANT SPELL
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Hello i need to open up two 13mm holes to 19mm i ran the part over to the machine shop as i dont have a 19mm bit and thay had ago but said they could not do it due to it being hardened steal
any idears?? Or links to a special drill bit i could buy?? Gessing it will have to be a diamond bit??
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#12
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Cobalt bits will go through it no problem.
I had to drill my crank. With normal HSS bits, it barely made a mark. Even with a cheapy cobalt bit off egay, it drilled no problem. I was quite amazed.
What exactly is it you need done though ? Could somewhere with a laser or waterjet machine open them up ?
I had to drill my crank. With normal HSS bits, it barely made a mark. Even with a cheapy cobalt bit off egay, it drilled no problem. I was quite amazed.
What exactly is it you need done though ? Could somewhere with a laser or waterjet machine open them up ?
#15
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Cobalt as said. But is go with tungsten carbide. Half the usual speed bit with an agressive feed. Probably find its only case hardened any way
The reason you agressive feed it is to stop it getting a chance the heat up and further harden it.
Assume your using a pillar drill as a minimum, not trying to pistol drill it lol
The reason you agressive feed it is to stop it getting a chance the heat up and further harden it.
Assume your using a pillar drill as a minimum, not trying to pistol drill it lol
#16
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Lol yea got a piller drill. Its like to washers they are only 3mm thick with 13mm holes in them all ready just need opening up to 19mm i think ill have to buy a bit and give it ago.
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#17
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If it's just a washer, wouldnt it be easier just to buy bigger ones ? Can they be held securely to run a drill bit through them to enlarge ?
Might be as handy with a die grinder and carbide burr to open them up.
Might be as handy with a die grinder and carbide burr to open them up.
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I've got cobalt and carbide bits up to 28mm, and a lathe/pillock drill if you need some help, use heat soak grease for cooling that's what I use, all my bits are shanked to 13mm so fit in a ordinary drill as well, just go up in 0.5mm or 1mm increments at a time will be no problem.
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