Drilling the hard stuff

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Drilling the hard stuff Peter Fairbrother 07-15-2008
Posted by Peter Fairbrother on July 15, 2008, 3:41 pm
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 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

Posted by Boo on July 15, 2008, 4:27 pm
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> 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.

Hi Peter,

Is this still about your liquid fueled rocket motor ? How's progress been
recently ? I'd be interested to hear an update and I'm sure lots of other people
here woulf be too.

Cheers,

--
Boo

Posted by BarryK on July 16, 2008, 1:58 pm
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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.
>
> Hi Peter,
>
> Is this still about your liquid fueled rocket motor ? =A0How's progress b=
een
> recently ? I'd be interested to hear an update and I'm sure lots of other=
people
> here woulf be too.
>
> Cheers,
>
> --
> Boo


Posted by BarryK on July 16, 2008, 1:57 pm
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> I need to drill a 3mm (or 1/8) hole in 58-62 Rockwell steel. Can't
> anneal it.
>

If you can get hold of some Diagrit Hardcut drills they'll make short
work of it - they are designed for drilliing out HSS taps, etc. using
normal workshop equipment.

I've not seen any advertised for years but I'm sure one of the tool
manufacturers must do something similar.............


Posted by Cliff Coggin on July 16, 2008, 8:55 pm
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>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,

I have used carbide drills in fairly hard (blued high carbon) steel but I
don't know how it compares on the Rockwell scale. Eternal Tools are good for
both carbide and diamond drills.

If you haven't used carbide drills before I suggest you buy two or three of
them. They are extremely brittle and will shatter at the slightest hint of
mis-alignment, wobble, or side load, and yet they need to be pushed into the
work firmly to cut well.

Cliff Coggin.



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