[sdiy] Machining aluminum, part deux

[Tim Ressel]

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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