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High speed drilling

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John Stevenson:
As I mentioned in a previous post I used to do a lot of small hole drilling usually on a Myford ML7 lathe.
Even with pressure lube to the bearing this was only really good for about 1100 revs on the white metal bearings.
that's far too low for 1mm or 40 thou drills so I built a powered tailstock out of an old fan motor.

I won't go into details as every lathe is different but basically it was a new tailstock barrel bored thru, two bearings and a jack shaft driving a tiny chuck that was small enough to fit thru the tailstock.



The motor had a tufnol slider plate screwed to the terminal box to give support, the motor was rated at 3,000 rpm opposite to the machines 1100 rpm so the true drill speed was 4,100 rpm, a far better call from standard.

JS.

bogstandard:
Now your production background is showing John.

Modding machinery to get the jobs done. :dremel:

Nice one. :clap:

John

Bernd:
What a neat idea. Just when you think you've seen it all too!  :thumbup:

Bernd

Darren:
Nice couple of gadgets there John, the second is ingenious, both motors working together to increase the speed...excellent idea and a darn good bit of info  :thumbup:

SPiN Racing:
Ohhh very Nice!!

I have read a lot about this tiny hole drilling phenom... I have nto had much need YET.. but filing all this away for sure!

Very cool trick!

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