Re: [CAD_CAM_EDM_DRO] Re: help--servos shaft stiff when unconnected

bluecoast1 wrote:

>Hi Jon,
>
>the shafts are 12mm (~1/2") and it's about all you could comfortably
>do to get them to turn between two fingers. They do spin freely at
>all--they stop immediately. I have a much larger yaskawa brushless
>servo that will spin for a second or two after you flick the shaft
>over. They feel like the shafts of some nema 34 steppers I have.
>
>I don't THINK they have a power-off brake; there is no additional
>wiring for one anyway.
>
>

If these are new motors, it is possible the bearing seals are just stiff.
I have seen some motors that got like that after sitting for years in
a warehouse. But, it sounds pretty strange. If they were DC brush
motors, i'd say hook them to a car battery for 10 minutes and see
what happened. They'd either loosen up or overheat, then you'd
know what the problem was. But with brushless motors, you
need the proper amp/driver to spin them.

Jon