> AS an ex-machinist, I can help with this. Don't run these at the highest speed
> possible, as the RPMs increase, you exceed the chip cutting capacity
> regardless of the type of material. The most efficient speed is not always the
> highest speed. I kept my cutter at about 1/2 the maximum speed of my VSR
> drill, and my cutter is still in fine condition after removing two rear
> fenders and a rear panel from a Spitfire as well as removing a rear quarter
> and two cowl panels from a Spridget.
> AS the cutter diameter increases, you need to reduce the RPMs to maintain the
> same SFM (surface feet per minute) cutting rate, otherwise
> you will overheat the bit and dull it quickly. The same goes for drill bits
> and end mills.
OTOH, if you get the ones from Horrible Fright, you will still
probably need several.
David L
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