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Forum topic by richgreer posted 05-25-2011 09:04 PM 3267 views 0 times favorited 18 replies Add to Favorites Watch
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richgreer

4541 posts in 2538 days


05-25-2011 09:04 PM

I was ripping a 6/4 piece of oak that, apparently, had a lot of internal tension. The tension from the wood literally caused my blade to stop, but the motor kept running. If my table saw had a belt I would assume that the belt was slipping, but my table saw does not have a belt that one can see.

I have the Jet Pro-Shop Table Saw. Does anyone know what would have been slipping and if this could do any damage to my saw? Is there an internal belt that one cannot see or a clutch mechanism?

I would expect, under these circumstances that the circuit breaker would pop, but that did not happen.

As an FYI – I did not hit the off button (probably should have) and I tried desperately to pull the wood out. It probably took 5 – 7 seconds to get the wood out but in the panic of the situation, it seemed like longer.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.


18 replies so far

View Will Stokes's profile

Will Stokes

265 posts in 2818 days


#1 posted 05-25-2011 09:27 PM

Is it possible you need to tighten up your blade a bit? Usually the nut will tighten itself during operation, although it was my understanding that the nut mechanism can actually ack like a clutch if you completely freeze up the blade.

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Bertha

13003 posts in 2156 days


#2 posted 05-25-2011 09:30 PM

I can’t imagine it was good for your saw, but I doubt it’s dead. I’m a JET guy and I’ve put mine through all manners of abuse. I like Will’s idea; maybe unplug it, pop the blade off, have a look around, then snug the blade up nicely. I’ve heard what he describes, where the arbor spins the nut so tight against the blade that it binds the gears. Good luck!

-- My dad and I built a 65 chev pick up.I killed trannys in that thing for some reason-Hog

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Viktor

456 posts in 2882 days


#3 posted 05-25-2011 09:45 PM

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richgreer

4541 posts in 2538 days


#4 posted 05-25-2011 09:56 PM

Thanks Viktor. That’s very helpful.

One of those belts has to be damaged a little. I certainly hope it is not damaged much because replacing that belt would be a real pain.

The arbor slip theory offered by Will and Bertha has merit, but I suspect that internal belt slippage is the more likely cause.

My TS is on a 20 amp circuit. I’m tempted to move it to a 15 amp circuit so that when/if this ever happens again the circuit breaker is more likely to trip.

Better yet – maybe it is time to trade up to a saw with some real power.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

View Bertha's profile

Bertha

13003 posts in 2156 days


#5 posted 05-25-2011 09:58 PM

Looking at the exploded, I like the belt theory too. Yeah, that won’t be a ton of fun! I like that saw quite a bit, though. Is a 5HP cabinet saw in Rich’s future? :)

-- My dad and I built a 65 chev pick up.I killed trannys in that thing for some reason-Hog

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knotscott

7211 posts in 2839 days


#6 posted 05-25-2011 10:07 PM

The Jet Proshop is belt drive….has two belts actually. It’s possible that the belt was slipping and that it has glazed over, or that the ribbed belt got stripped of it’s ribs…worth a look anyway. Could also be the blade, but since they’re self tightening, it’s not all that likely. There’s even some remote chance that one of the pullies has come loose and was spinning.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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richgreer

4541 posts in 2538 days


#7 posted 05-25-2011 10:08 PM

I think I am ready to “bite the bullet” and add 220 amp service in my shop, but it will be single phase. Once I do that, I can see a more powerful TS, a bigger jointer and an electronic variable speed lathe in my future. It would be good if I could also see winning the lottery in my future as well. However, I am at a disadvantage on that lottery thing. Apparently, a person who does not buy lottery tickets has never won.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

View dbhost's profile

dbhost

5605 posts in 2695 days


#8 posted 05-25-2011 10:16 PM

I have had this happen once with my BT… I had to replace the belts afterwards… Instead of slipping, they sheared off. From what I understand, they are designed to do that to protect the motor…

-- My workshop blog can be found at http://daves-workshop.blogspot.com

View spunwood's profile

spunwood

1198 posts in 2299 days


#9 posted 05-26-2011 02:48 AM

Rich, excuse my ignorance, but is “the motor still running” different than the buzzing sound when I stall the blade? This happens when I feed something too fast (especially red oak) or with sheet goods that I twist or don’t support properly.

I ask to understand whether I should also be concerned and thus forced to win the lottery and by a 5hp ts!

-- I came, I was conquered, I was born again. ἵνα ὦσιν ἓν

View TheDane's profile

TheDane

4997 posts in 3126 days


#10 posted 05-26-2011 03:55 AM

Rich—Same thing happened with my Jet 708100 a year or so back … it has a 2 belt drive similar to yours. I was ripping a piece of 8/4 oak, she just got bogged down. I killed the power to the motor, removed the stock and gave her a visual inspection … no apparent damage, so I resumed work … just slowed down my feed rate a bit. The saw runs fine, and it hasn’t happened since.

—Gerry

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

View gfadvm's profile

gfadvm

14940 posts in 2153 days


#11 posted 05-26-2011 05:00 AM

Rich Consider yourself lucky! A 3hp saw would have taken that board away from you and chucked it back at you at a high rate of speed. See, there are advantages to lower hp saws. This is why I really like a switch that can be shut off by bumping it with your knee instead of having to take your hand off the stock. BE CAREFUL.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View Chipy's profile

Chipy

374 posts in 2056 days


#12 posted 05-26-2011 01:55 PM

Rich is there a woodruff key on any of your pulleys? It is possible to shear a key and have the motor still run but not likely.If the motor is still turning the belts probably have slipped.Was there any smell like rubber burning? I am going with more horse power for my next saw. I think it is safer! I worked for 10 years with a Delta uni saw 3hp and never kicked back a piece of lumber ware as my Ridgid TS 2412 1 1/2hp at home,lets just say scared me a few times! From experience I have found that kick back occurs when the blade slows down ripping thick hard woods causing friction,burning the teeth dig and when the motor starts turning at full speed again it wings it out of the saw.With low horse power your set up and blade condition are crucial.A good quality thin Cerf blade my helpful. Hope this res ponce does not sound condescending and helps you out!!

View Kent Shepherd's profile

Kent Shepherd

2718 posts in 2749 days


#13 posted 05-26-2011 05:33 PM

Rich, Over the years I have bogged down saws several times. It scared me when you said you didn’t kill the power. That’s the first thing I always do. I think you’re asking for trouble if you try to free it up with the saw still on. There is no telling what might grab as you work it free.

I agree with some—most likely the belt, but could certainly be other issues.

-- http://shepherdtoolandsupply.com/

View Bertha's profile

Bertha

13003 posts in 2156 days


#14 posted 05-26-2011 05:36 PM

Chipy’s got a great point that I hadn’t considered. Is there a tap that secures your pulley to the shaft (I don’t know what a woodruff key is, maybe this(?) )? Maybe your pulley’s rotating freely on the shaft?

-- My dad and I built a 65 chev pick up.I killed trannys in that thing for some reason-Hog

View Chipy's profile

Chipy

374 posts in 2056 days


#15 posted 05-26-2011 05:46 PM

Bertha and Rich Sometimes called a half moon Key.

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