S/Seel and the minilathe

[m_c]

You'll still get galvanic corrosion with stainless in aluminium. It's just the stainless won't corrode, and the aluminium will. The same can be said for common steels, it's just the steel will also oxidise due to moisture, as well as the aluminium due to galvanic corrosion.

303 is the easiest common grade to machine, however you still need to be able to take reasonable cuts. The moment you stop cutting and start rubbing, you risk work hardening. You really need to be able to get the required dimension first time, as trying to take a skim to get on diameter is a recipe for problems.