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I'm having trouble with one carriage. The picture is a composite of two shots.
The carriage on the left see how tight it is at the red dots.

[img]http://www.craftgizmos.com/rostock/two-carriages.jpg[/img]

The sleeve on the bearing is rubbing the axle support, that I can easily smooth down. Then, and so far I don't know what to do, the eccentric cam on the right is so close to the locknut the cam won't turn.

Then, I've got two of the three belts installed. Trying the third one the motor is so stiff it barely turns. So where in the video the carriages move freely up and down with light hand pressure when the belts are connected, one of mine is really like pushing a heavy box. This doesn't seem right, but these motors are new to me so I don't know how they are supposed to feel, but one of these sure is stiff.

Richard

Try adjusting the eccentric bushings so that the wheels are in the opposite direction from the axle support (up for upper and down for lower)... So, for the top one make it adjust inward in the up position (like the other one you assembled). Same thing for the bottom, you have the upper tensioned by bringing the eccentric up (from the bolt centerline), you can reach the same tension with the eccentric going up or down.

I ran into the same thing during my build...

Tony

I got a reply from John. He thought the motor wires might be touching. They might have been, I left them as they were in the plastic sleeve after I installed the motor. So, now I've got the belt on and it seems pretty much like the others.