[sdiy] Machining aluminum, part deux

[cyborgzero at comcast.net]

Well, that usually works for aluminum, but sometimes the grade and
other things can make you change the cut depth and speed, depending on
what type of finish and how accurate a cut you want.

But, yes, I do the same thing usually. ;)

Rob

----- Original Message -----
From: "Tim Ressel" <madhun2001 at yahoo.com>
To: "Tony Clark" <clark at andrews.edu>; "Synth-DIY"
<synth-diy at dropmix.xs4all.nl>
Sent: Thursday, April 18, 2002 4:01 PM
Subject: Re: [sdiy] Machining aluminum, part deux


> yo,
>
> --- Tony Clark <clark at andrews.edu> wrote:
> > First, depending on the size of the hole you may
> > want to adjust the speed
> > of the drill.  The smaller the hole, the faster the
> > drill should be
> > turning.  The reason to do this is to keep the size
> > of the shavings down
> > to a size that is appropriate for the bit.
>
> <Machinist Mode>
>
> Actually, the reason is surface speed at the outside
> edge of the cutting fase of the drill. The larger the
> drill, the more distance the outer part of the drill
> face covers per revolution, thus more surface speed.
> Surface speed equals heat.
>
> This is kinda moot with aluminum, tho'. When cuuting
> steel on a milling machine, I have to take into
> account the cutter size, the depth of cut, the steel
> type, etc, etc, when figure a feed rate and RPM to
> match. With aluminum I crank the RPM to max, feed rate
> to max, and feel sorry for the guy on the next amchine
> over as a stream of chip flys over at him.
>
> </Machinist Mode>
>
> --TR
>
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