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Table Saw Motor/Pulleys Shudder On Slowdown... Why?

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Forum topic by jonah posted 308 days ago 1127 views 0 times favorited 23 replies Add to Favorites Watch
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jonah

452 posts in 1933 days


308 days ago

I have a Ridgid 3650 that has served me well for the last five or so years. Pretty much the whole time I’ve had it, the saw has made a shuddering noise when the belts slow down after I turn it off. The motor runs perfectly well, smoothly and quietly. It cuts fine, doesn’t heat up, doesn’t trip its thermal breaker or anything else.

Why is it shuddering? Is it something to be concerned about? How do I fix it? I don’t have a great deal of experience with induction motors aside from this saw.


23 replies so far

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tefinn

1207 posts in 1071 days


#1 posted 308 days ago

Does it vibrate at all on start up? Check the belt for wear or set in the belt from sitting too long. Also make sure the pulleys are tight and co-planer to each other. And last of all check the bearings throughout for wear.

-- Tom Finnigan - Measures? We don't need no stinking measures! - Hmm, maybe thats why my project pieces don't fit.

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jonah

452 posts in 1933 days


#2 posted 308 days ago

It doesn’t vibrate appreciably on startup, no. When I got the saw, I checked the pulleys and adjusted them to be coplanar. I will check them again when I get some time. I will have to do some disassembly to check into the bearings, so that’ll take a while.

I’m almost positive I replaced the belt when I got the saw, so belt wear probably isn’t a factor, but I might be misremembering. What does belt set look like?

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tefinn

1207 posts in 1071 days


#3 posted 308 days ago

Belt set is caused by the motor tension on the belt when the tool isn’t used for awhile. The belt “sets” to the shape of the pulleys. This will cause the tool to vibrate on start up and shut down. If it’s bad enough it will even vibrate while running. It usually goes away with a little use, but if the belt is stiff or old it may not go away. A lot of people change to link belts to eliminate this problem. You said you’ve used the saw “five or so years”. If the belt is that old it could be getting stiff, especially if you don’t use it regularly or it’s in non-heated shop.

To check the bearings just spin the shafts (motor and arbor) and check for grinding. Then see if they have up and down play.

-- Tom Finnigan - Measures? We don't need no stinking measures! - Hmm, maybe thats why my project pieces don't fit.

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jonah

452 posts in 1933 days


#4 posted 308 days ago

Thanks for the explanation. The motor shaft and arbor both spin smoothly with no grinding. I have been meaning to go to a link belt anyway, so maybe I’ll just replace the belt and see if that solves the problem.

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AlanBienlein

141 posts in 1309 days


#5 posted 308 days ago

You have the same saw I do and it originally came with a serpentine belt which is much better than a link belt. I’ve had this saw since 2005 and am using the same serpentine belt it came with.

Mine use to shutter on shut down like yours until I put a resistor across the terminals of the start capacitor. Then the problem went away. Check to see when it happens. If you notice the shudder right after you hear the centrifugal switch reengage then a resistor across the start cap terminals might be the answer.

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Jim Finn

1658 posts in 1556 days


#6 posted 307 days ago

I have this saw and mine has a serpentine belt and has served me well since 2006. I have done no repairs or changes to this saw and I use it every day.

-- In God We Trust

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jonah

452 posts in 1933 days


#7 posted 306 days ago

My saw does not have a serpentine belt, just a normal v-belt. I have never seen a contractor saw with a serpentine belt before, honestly. The manual, parts diagram, and every 3650 I’ve seen all have v-belts.

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AlanBienlein

141 posts in 1309 days


#8 posted 306 days ago

Here are a few pics of my TS3650. My wife bought me this saw for Christmas back in 2005 and has seen use ever since then.


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taoist

110 posts in 1125 days


#9 posted 306 days ago

If your belt is the same as in the pictures, it is a ribbed belt.

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yrob

340 posts in 2287 days


#10 posted 306 days ago

Its the belt. I have the same saw and had exactly the same problem. As soon as I replaced it, the vibration disappeared. Regarding, the link belts, It does not work well on a TS3650 because of the peculiar shape of the pulleys. You would have to replace those pulleys with standard cast iron ones that are not ribbed. I did try to use the link belts and they kept jumping off. I just bought a new serpentine belt instead.

-- Yves

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firefighterontheside

3917 posts in 491 days


#11 posted 306 days ago

Someone asked this same question a while back and it was brought up that on power down there can be an electrical anomaly where the still turning motor creates that vibration. Someone else can or may explain it better. I believe knotscott explained it best.

-- Bill M. I love my job as a firefighter, but nothing gives me the satisfaction of running my hand over a project that I have built and just finished sanding.

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MarkwithaK

370 posts in 1812 days


#12 posted 306 days ago

This may seem rather silly but are you certain that there is no wobble on the saw? I saw this because one of the levelers on my 4511 is shy of making contact with the floor and I get the same thing on powering down.

-- If at first you don't succeed then maybe skydiving isn't for you.

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Rick M.

3885 posts in 1014 days


#13 posted 306 days ago

A slight shudder when nearing a stop is normal on contractor/hybrids I thought. My Delta has always done it and has machined pulleys. Adding a link belt did help but not stop it completely.

-- |Statistics show that 100% of people bitten by a snake were close to it.|

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tefinn

1207 posts in 1071 days


#14 posted 306 days ago

jonah – The guys are right that the belt on your saw should be a ribbed belt and not a v-belt. Wasn’t thinking, Ridgid uses ribbed belts and you can’t use a link belt. It could still be the belt causing the problem or the motor mounting might need adjusting to take out excess slack. I’m not familiar with the electrical problem firefighterontheside mentioned so I can’t advise on that.

-- Tom Finnigan - Measures? We don't need no stinking measures! - Hmm, maybe thats why my project pieces don't fit.

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firefighterontheside

3917 posts in 491 days


#15 posted 306 days ago

I’ll do a search and see if I can find the post I mentioned.

-- Bill M. I love my job as a firefighter, but nothing gives me the satisfaction of running my hand over a project that I have built and just finished sanding.

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