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Re: Newowner Informaton

#249134 by JPG » Thu Jun 07, 2018 10:49 pm

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!

Welcome!!!!

---

╔═══╗
╟JPG ╢
╚═══╝

Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10E(SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange

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Re: Newowner Informaton

#249202 by Viejo » Sat Jun 09, 2018 5:21 pm

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!

Welcome!!!!


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.

Cheers,

---

Viejo- Mk5 Greenie, s/n 328507 (second owner), shaper, 4" jointer, 18" jigsaw

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Re: Newowner Informaton

#249208 by JPG » Sat Jun 09, 2018 6:31 pm

The differing resistance was likely due to belt deformation(they had taken a 'set').

If the motor was not humming loudly when it 'stopped', it likely had a sudden power interruption.

I would check the switch and wiring (electrical continuity).

An ohmmeter would be helpful!

Finally verify the bearing and wire loop are present on the end of the control sheave hub.

---

╔═══╗
╟JPG ╢
╚═══╝

Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10E(SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange

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Re: Newowner Informaton

#249221 by Viejo » Sun Jun 10, 2018 1:57 pm

JPG wrote:The differing resistance was likely due to belt deformation(they had taken a 'set').

If the motor was not humming loudly when it 'stopped', it likely had a sudden power interruption.

I would check the switch and wiring (electrical continuity).

An ohmmeter would be helpful!

Finally verify the bearing and wire loop are present on the end of the control sheave hub.


JPG- Alas, the motor did hum heartily after stopping (until I opened the switch), and a continuity check of all switch related wiring was positive. Your mention of deformed belts being responsible for varying resistance to rotation never occurred to me (thanks, I've learned something already!) so I double checked them for pliability and they were ok. No funeral plans yet, but the future does not appear all that rosy for the old motor.

Cheers,

Dave

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Viejo- Mk5 Greenie, s/n 328507 (second owner), shaper, 4" jointer, 18" jigsaw

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Re: Newowner Informaton

#249222 by everettdavis » Sun Jun 10, 2018 2:36 pm

Check to see if the spring-loaded centrifugal motor start contacts return to the closed position and don’t have an obstruction between them. Without them closing the motor start windings are disconnected and the motor will hum trying to start from the run windings which it cannot do.


Some have an external motor start relay whose contacts can fail etc.

Everett

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Re: Newowner Informaton

#249224 by JPG » Sun Jun 10, 2018 3:53 pm

Humming is actually a good sign(as long as the duration was short). Jerking then humming is how they act when the start circuit is ineffective.

Start a new thread and we can proceed from there.

---

╔═══╗
╟JPG ╢
╚═══╝

Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10E(SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange

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