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Posted by on July 16, 2008, 9:43 pm
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On Tue, 15 Jul 2008 20:41:23 +0100, Peter Fairbrother
>I need to drill a 3mm (or 1/8) hole in 58-62 Rockwell steel. Can't
>anneal it.
>
>Will carbide do? Do I need to use diamond?
>
>If so, sources for a suitable drill? The hole must be pretty accurate,
>maybe even reamed.
>
>Ideas? It's only one or at most two holes, so buying EDM or similar
>machinery, much as I'd like to, isn't practical.
>
>Thanks,
>
>-- Peter Fairbrother
Greetings Peter,
Carbide will indeed work. The drill should have straight flutes and a
split point. Use lots of high steady pressure. The chips will exit red
hot and almost molten. A rigid setup is a must. If the hole is a
through hole then you will need to back up the part with steel that's
as hard as the part. Softer steel risks breaking the drill.
Cheers,
Eric
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Posted by John on July 17, 2008, 12:17 pm
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I've used the "drill anything" bits with success. They look like
masonary bits. The technique is to use lots of speed and lots of
pressure. The friction heats the metal which goes soft and the drill
then cuts it. I've seen files and hacksaw blades drilled like this.
Mind the swarf though, it can be white hot.
John
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Posted by dave sanderson on July 17, 2008, 5:14 pm
Please log in for more thread options > I need to drill a 3mm (or 1/8) hole in 58-62 Rockwell steel. Can't
> anneal it.
>
> Will carbide do? Do I need to use diamond?
>
> If so, sources for a suitable drill? The hole must be pretty accurate,
> maybe even reamed.
>
> Ideas? It's only one or at most two holes, so buying EDM or similar
> machinery, much as I'd like to, isn't practical.
>
> Thanks,
>
> -- Peter Fairbrother
you could try a stellite drill, such as http://www.cromwell.co.uk/DEL0265050A
not cheap at list price, but they are usually discountable, and other
sizes available.
Dave
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Posted by dave sanderson on July 17, 2008, 5:20 pm
Please log in for more thread options wrote:
>
> > I need to drill a 3mm (or 1/8) hole in 58-62 Rockwell steel. Can't
> > anneal it.
>
> > Will carbide do? Do I need to use diamond?
>
> > If so, sources for a suitable drill? The hole must be pretty accurate,
> > maybe even reamed.
>
> > Ideas? It's only one or at most two holes, so buying EDM or similar
> > machinery, much as I'd like to, isn't practical.
>
> > Thanks,
>
> > -- Peter Fairbrother
>
> you could try a stellite drill, such ashttp://www.cromwell.co.uk/DEL0265050A
> not cheap at list price, but they are usually discountable, and other
> sizes available.
>
> Dave
oops, just notice they are out of stock. must be available elsewhere,
or
direct from delloro
Dave
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Posted by BarryK on July 18, 2008, 4:53 am
Please log in for more thread options " you could try a stellite drill, such ashttp://www.cromwell.co.uk/DEL0265050A
not cheap at list price, but they are usually discountable, and other
sizes available.
Dave "
I have some 4mm carbide tig electrodes - they grind much like
stellite, would a 'drill' fashioned from that do?
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>anneal it.
>
>Will carbide do? Do I need to use diamond?
>
>If so, sources for a suitable drill? The hole must be pretty accurate,
>maybe even reamed.
>
>Ideas? It's only one or at most two holes, so buying EDM or similar
>machinery, much as I'd like to, isn't practical.
>
>Thanks,
>
>-- Peter Fairbrother