[simpits-tech] High speed steel drill

[kelly Mclaren]

Ok, everything went fine following your advice. Actually it worked very nice
considering it's not a  state of the art drill press.
When I asked that question, it was more towards preserving  my drill then
anything else, since they cost a bit.
I'm going to keep on experimenting with deferent material
Tools tools tool
Thanks Marv,Steve

Marc..
----- Original Message -----
From: "Marv De Beque" <mdebeque@woh.rr.com>
To: <simpits-tech@simpits.org>
Sent: Thursday, September 19, 2002 6:34 AM
Subject: Re: [simpits-tech] High speed steel drill


> Look at the chips you make.  If they are long clean spirals, then it
should
> be fine.  If they are blue and fracture easy, then it's too fast and hot.
>
> You are making too much of this in my opinion.
> --
>
>
> > From: mysticz28@swbell.net
> > Reply-To: simpits-tech@simpits.org
> > Date: Thu, 19 Sep 2002 01:44:12 -0500
> > To: simpits-tech@simpits.org
> > 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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> > Thanks!
>
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