[simpits-tech] High speed steel drill

[kelly Mclaren]

Thanks Steve, I'm drilling steel tubing, <finding the
 speed of the edge of the bit in feet per minute at a given RPM >Now how do
I calculate that?

Marc..
----- Original Message -----
From: <mysticz28@swbell.net>
To: <simpits-tech@simpits.org>
Sent: Monday, September 16, 2002 1:32 PM
Subject: Re: [simpits-tech] High speed steel drill


> kelly Mclaren wrote:
> >
> > Guys, just made myself a present, a five speed  8'' drill press. Now
> > here's a dum question, for a high speed 29/64 steel drill, at what
> > speed should I set my drill press? The instruction manual says 1100
> > rpm, but is that for low speed drill or a high speed drill? And also,
> > should I use oil while drilling?
>
> What material are you drilling? There's a long and involved way to
> figure out the spindle speed needed, but basically it means finding the
> speed of the edge of the bit in feet per minute at a given RPM and
> looking it up in a chart. I make more holes with the lathe than anything
> else these days (except wood and composites, which aren't particularly
> demanding on SFM precision), so it's not exactly the same.
>
> And if you're drilling anything other than soft stuff, use oil. I like
> automatic transmission fluid and Tap Magic myself. If you don't use
> anything you'll kill the temper on the bit and weld bits of swarf to it.
> No fun.
> --
> Steve
> mysticz28@swbell.net
> Jesus saves, Budda enlightens, Cthulhu thinks you'll make a nice
> sandwich.
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