It is a simple question really that would be hard to embellish. While I'm using my belt sander the belt drifts. Sometimes almost half way off the assembly. This does not happen constantly but very often. Yes, there is a mechanism that prevent the belt from going to far the other direction (back towards the sander) but nothing that stops it from leaving (nor could it).
Is it pressure, technique, belt quality, belt sander quality. I've been trying variations of pressure and handling but it still slides off.
How can I keep my belt on properly?