JPG wrote:How did you ascertain a defective motor by rotating the saw blade and how did you 'confirm' that?
The damage done to the speed control is typically mashing of the teeth on the quadrant gear(porkchop) and deformation of quadrant gear pivot legs.(fixable)
The later induction motor is 1 1/8 HP and is a direct replacement. I would not 'upgrade' until I had determined it is necessary.
If your 'confirmation' was due to it not running, look for why before assuming it requires replacing.
Now the belt running on the idler shaft may be an indication of the control sheave missing the bearing etc. on the end that rides on the quadrant gear. A pix will confirm that. Also fixable!
JPG... thanks for the quick response! As always, good questions are the first step to good solutions!
When I hand rotated the blade at the estate sale I felt significantly varying degrees of resistance during the course of each revolution. A follow-up powered check of the motor in my shop resulted in (very) slight initial rotation and then full stop. The o/o switch is good and all external wiring and connectors are undamaged.
Without going any deeper than the removal of the headstock covers, my inspection showed the sheaves moving in what appeared to me to be a smooth and even manner when I rotated the Speedial. The belts show no sign of "trauma", i.e. burned or abraded sections. The catch here, of course, is that this is new ground for me so I may not really know what it is I'm looking at/for.
I believe my next course of action should be to start watching some of the numerous videos noted on the SS forum (the "sawdust series" sounds promising) to get a good baseline of general knowledge about the Mk5. I like to do do my own maintenance, but I'm also a firm believer in "physician- first, do no harm", so I'll proceed slowly. I also remember the advice given to me by one of my first "sea daddys" when I joined the Merchant Marine years ago- "before you beat yourself half to death trying to solve a problem, first take a minute and find out if someone else already has".
I must say at the outset that I am extremely impressed with the SS community. I knew SS had a loyal following, but I had no idea it was so vast and wide ranging.
Viejo- Mk5 Greenie, s/n 328507 (second owner), shaper, 4" jointer, 18" jigsaw