will not turn

revnuman · Post by **revnuman** » Mon Dec 13, 2010 9:26 pm

saw blade will not turn motor comes on sounds like its in a bind

JPG · Post by **JPG** » Mon Dec 13, 2010 10:33 pm

revnuman wrote:saw blade will not turn motor comes on sounds like its in a bind

Remove the saw blade, install a sanding disk or a faceplate and see if it can be rotated by hand.

Now for the 'tough' question! Has any one attempted to rotate the speed control dial with it NOT running?(like lower the speed)

If it will not rotate easily by hand, the drive belt is probably jammed in either the control sheave pulley or the floating sheave pulley. This happens if the sheave is positioned too far away from the fixed flange of the pulley and the belt gets caught down near the center of the pulley.

The floating sheave pulley is accessed by removing the 'belt cover' on the left end on the headstock. If the belt is jammed, the floating sheave can be pulled out towards the end of the motor shaft(a very stiff spring) to release the belt.

BTW the belt can drop down into the control sheave if the ss is moved or jarred with the speed set to high.
If it is the control sheave that is jammed, access is a bit more 'challenging'. The control sheave pulley is inside the headstock. The first thing to do is to CAREFULLY(do not force it) adjust the speed control towards high speed. This will 'normally' open up the control sheave and if you also attempt to rotate the shafts in the right direction, the belt will come free(observing the belt jam to determine the better direction is necessary). The sheave and maybe the belt may be observed through the hole in the side under the shopsmith 'medallion'. Hopefully you have a newer model that does have a hole under that 'logo'.

This is probably more than enough to choke on, so if you want, take a step at a time and tell us the outcome of that step. We may need pix to help us 'guide' you.

wa2crk · Post by **wa2crk** » Tue Dec 14, 2010 10:39 am

Don't forget to UNPLUG the machine from the wall outlet when performing ANY work inside the headstock, or for that matter, any work on the machine. The full line voltage is always on the switch terminals when the machine is plugged in.
Bill V

dusty · Post by **dusty** » Tue Dec 14, 2010 11:23 am

My approach would be as follows:

Turn off and unplug the Mark V/5

Remove the belt cover

Remove the blade/arbor

Install the sanding disk

Using the sanding disk, attempt to rotate it

If the drive belt is stuck between the sheaves, this rotation may release it.

This Sawdust Session might be of interest. There are a couple pictures that show the relationship of the belt with respect to the sheaves (at high and low speed). The thread is not directly related to your situation - just of interest.

This post might also be of interest.

JPG · Post by **JPG** » Tue Dec 14, 2010 1:04 pm

dusty wrote:My approach would be as follows:

Turn off and unplug the Mark V/5

Remove the belt cover

Remove the blade/arbor

Install the sanding disk

Using the sanding disk, attempt to rotate it

If the drive belt is stuck between the sheaves, this rotation may release it.

This Sawdust Session might be of interest. There are a couple pictures that show the relationship of the belt with respect to the sheaves (at high and low speed). The thread is not directly related to your situation - just of interest.

This post might also be of interest.

Strange looking 'sawdust session' dusty!;) Excellent thread!!!!