jim rozen wrote in message ...
Ah. Aluminum. I would have gone to steel first. But
for this application obviously Al is a better choice.

The yield strength of many Al alloys is certainly within the range of gray
iron. The aluminum will wear faster, but these were metric transposing
gears, I probably use them 2-3 times a year.

You did this with a form cutter?

Ya, a standard Polish gear cutter. It only took one cutter. That and a 5/32"
keyway broach were the only special tooling I had buy.

Paul K. Dickman