[JABianchi]

I love the idea of making our own sprockets with a CNC mill, but have a couple questions for the more experienced:

(1) What's the best way to keep the sprockets from moving around on the last pass? (Especially if you are doing a tool change for finishing...) Are you using a vaccum table or another method?

(2) What's the easiest way to get the hex-shaped bore for the sprocket? Is the fillet from the CNC mill negligible or do you need to file or broach it after milling?

Thanks for any advice!