When Grinding a Valve the Chuck Rotation Slows or Stops

This is a common problem that typically happens right after replacing either the Chuck Belt or the Chuck Motor.

On the end of the Chuck Motor is a splined pulley that has a "one-way clutch" built into it. It's not uncommon for the person doing the change of Belt or Gear Motor to inadvertently install this pulley back on the motor shaft backward.  The result is that the motor now has no grip on the pulley to force it to rotate against the force of the grinding stone. You can verify this by having the chuck cover lifted enough to see the end of the motor shaft and pully while you carefully engage a valve against the grinding wheel.  Or you can check it by hand, too.  

    


The splined pulley pictured above has a clutch assembly built into it.  If you look at the center opening on each side of the pulley you will notice that one side is slightly inset and has some small writing on it as well as an arrow showing the direction of the clutch. This inset side of the pulley should be mounted towards the motor and the flush side out away from the motor for correct operation.

And then lastly, the belt itself should be as loose as possible without it slipping.  By having this belt as loose as possible it is far less likely to transfer any motor vibration over to the end of the chuck.  Vibration there would be multiplied out to the valve face surface causing "chatter" in the finish which looks like a bunch of line across the ground surface.

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