I should have mentioned from the outset it is Aluminum. It's for my mini-lathe. I am replacing the stock 750W brushed motor with a 1200W brushless motor. The tiny V-belts that currently drive the spindle are too frail. I've owned it less than a month and one of the V-belts shredded itself. They are also quite expensive and hard to find, being something of a specialty item. I am replacing the 2-step V-belt pulley system with a single flat timing belt.There are videos on you tube broaching on a lathe or mill.
Mr Pete, and Kieth Appleton to name a couple.
What machines do you have or access to? What material is pulley?
What does this pulley do? Pics would help too.
Chuck
I already had a friend broach one of the pulleys with a 5mm HSS bar using his lathe. The results were not very good.