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Post  Post subject: Speed of drill when drilling metal?  |  Posted: Tue Jul 11, 2017 1:14 pm
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Joined: Mon Oct 03, 2016 9:05 am
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Hi, I recently changed the car brake discs and pads for a friend, but the disc retaining screws, (made of steel with a female TORX head), had been rounded off by somebody, so I had to drill them out.

Question:
How fast should one turn a metal drill bit? I used a handheld battery drill on a very slow speed setting,(and some penetrating oil as cutting fluid), and long helical pieces of swarf were produced.

This was OK, but it took ages, and as I changed up to larger and larger diameter drillbits, they started digging in and jamming. If I turned the drill much faster, the jamming did not occur, but neither did I get the long pieces of swarf.

What is the best speed to use? The drill bits are called HSS, high speed steel - does this mean they should be spun very fast?

OB


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gbalkam
Post  Post subject: Re: Speed of drill when drilling metal?  |  Posted: Fri Jul 14, 2017 7:21 pm
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Joined: Sun Sep 25, 2016 8:19 pm
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So, this isn't really the "sciencey" answer, but since i had the same issue on a smaller scale...
You are using the wrong tool. You want a screw/bolt extractor. Basically... it drills in one direction, revers the drill and it bites into the metal so you can remove the bolt of screw.
https://youtu.be/y8RCsu3BzUM
https://www.thegrabitstore.com/pages/how-to-use

I know there are similar tools, I have a smaller version 3mm coming for use on tiny screws that are stripped.

Not intending any advertisement value from links, just as a product solution to OP.


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One beer
Post  Post subject: Re: Speed of drill when drilling metal?  |  Posted: Tue Jul 18, 2017 12:57 pm
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Joined: Mon Oct 03, 2016 9:05 am
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No, I was drilling a hole through the bolt, a) to weaken it, and b) so I could then use a stud extractor to remove the bolt.

This worked perfectly, but my actual question was about drilling speeds into steel.

Does anybody know the answer to this?

OB


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