Hi Everyone,
I wanted to ask your advice please. I've recently acquired a second hand MI-250 (actually there aren't any new so the second hand bit is a little superfluous). Anyway, I put it together and started testing it and am a bit worried about the DEC worm drive - it grinds and bumps.
I'm advised by someone that these things are part of the learning curve, are normal and don't become an issue when there's a proper load on the mount (i.e a scope and counterweights).
I wanted to ask the learned community here - it that right? Are these kinds of things normal for large direct drive style mounts?
I've got some new bearings coming to me because I separated the worm drive from the worm block to determine what was causing the grinding noise and odd DEC drive behaviour and you can see the state of the old bearings
here (or
here) and hear them operating
here - but my original question stands - is this normal?