motor mount vibration vs torque'd bolts

[Jonathan]

Over complicating the job.!!. . . . Just tighten the buggers up and they will be fine, never had one fall off yet.!!

No fancy washers needed Spring washers work fine.

That's alright for some - i.e. the people who use AM882 drives or others with resonance damping algorithms. However if you're using a more generic drive it can help if you're having problems with resonance to use some sort of 'anti vibration' mount. Some stepper motors I got from a large plotter (nema 34 and 23), were mounted with a piece of thin neoprene rubber between the front face of the motor and the mount, with the screws inside small rubber bushings which pushed into the motor flange.

It's worth remembering that stepper motors can conduct a significant amount of heat from the mounting face, so it's a good idea to bolt them to a reasonable size piece of aluminium. Clearly putting neoprene in between is not going to do the thermal conductivity much good, so the motors will run at a higher temperature.