Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Hey Jim .... seen your hobbing plenty of times and think it is really great, though I rarely experience any serious belt slip, but then I don't run very load heavy accessories much. Really need to build myself a Baker Fan some one of these days ... but I digress.

What I would like to ask you is what sort of pulley groove do you prefer to do your hobbing on. I realize it can be done on most any form of groove, but am wondering what you find works best a slightly flared U-shaped groove or a V-shaped groove? If you prefer a V-shaped groove, what angle do you find most effective, 90, 120 or some other degree of divergence???