[simpits-tech] High speed steel drill

[kelly Mclaren]

Steve, if you do find that chart, I wouldn't mind a copy of it
Thanks, Marc..
----- Original Message -----
From: <mysticz28@swbell.net>
To: <simpits-tech@simpits.org>
Sent: Thursday, September 19, 2002 2:44 AM
Subject: Re: [simpits-tech] High speed steel drill


> kelly Mclaren wrote:
> >
> > 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?
>
> It's easiest with a SFM chart, but it's just:
>
> (Pi * bit dia. * RPM)/12
>
> if I remember right. Somewhere I have a chart that makes it easy. First
> find the bit diameter row and material column. Where the two intersect
> is the spindle speed. I had a spreadsheet that I modified with the
> specific spindle speeds I have available on the big drill press (wish it
> had a quick change gearbox, but it's only a dual belt/3 pulley system)
> so it was a piece of cake. I also printed it in color so that if the
> material is drilled dry the RPM is black, cutting fluid is green, and
> wax is red. I had pages for HSS, cobalt, bimetal (hole saws, mainly),
> and carbide.
>
> Unfortunately I can't find the bloody charts ANYWHERE.
> AAAAAAAAHHHHHHH!!!!
> --
> Steve
> mysticz28@swbell.net
> Jesus saves, Budda enlightens, Cthulhu thinks you'll make a nice
> sandwich.
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