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Forum topic by doninvegas posted 935 days ago 1589 views 0 times favorited 42 replies Add to Favorites Watch
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doninvegas

332 posts in 1505 days


935 days ago

I have a Delta contractors saw that I have had for a few years now and it does what I want it to do. But the motor vibrates like crazy. So much so that it has even fallen off. I know that these saws are made to take the motor off for easy transport. I have taken the motor off and reinstalled it a dozen times aligned the pulleys per the manual but it still vibrates like crazy. I now have to put a stick under the motor to stabilize it while not making the belt too lose. Does anyone have one of these saws and if so did you have the same problem and did you fix it?
Thanks

-- "Courage is being scared to death -- but saddling up anyway."


42 replies so far

View Howie's profile

Howie

2656 posts in 1520 days


#1 posted 935 days ago

Don: I used to live in Vegas.
You have an accident waiting to happen I think. My solution is there is a large lake close by with lots of boats…..
Sounds like a bent shaft.

-- Life is good.

View madts's profile

madts

1231 posts in 937 days


#2 posted 935 days ago

I did and put a new belt on it. Since the pulleys are so small in dia. they get a set that can cause bad vibration. I replaced mine with “power twist link belts” from Rockler. Runs very smooth now. My saw is a 12” contractor saw about 30 years old. I hope this works for you.

-- Thor and Odin are still the greatest of Gods.

View doninvegas's profile

doninvegas

332 posts in 1505 days


#3 posted 935 days ago

Madts,
I have changed belts including a power link It didn’t work.
Howie,
Lake Mead is close but I can’t afford a new saw, otherwise this one would bo on CL or be sold as a boat anchor.

-- "Courage is being scared to death -- but saddling up anyway."

View sandhill's profile

sandhill

2102 posts in 2521 days


#4 posted 935 days ago

Check the amps that it is drawing Don if its high without a load its bearings. Sometimes the bearings will cause vibration when they dry out, sounds like your starting to experience bearing failure in the early stages. You can take it to a repair center which is cheaper than a new saw, do it soon before it spins the shaft.

-- Bob Egbert AKA Sandhill http://www.sandhillwoodworks.com/

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Grandpa

3044 posts in 1273 days


#5 posted 935 days ago

I have a friend that owns this saw and it vibrated badly. We checked it out and it was the belt sheave. I don’t remember which one (motor or arbor) but I think he changed both of them and got a new belt while he was there. Just the regular V-belt. It is smooth today. I would look there then I would check for a bent shaft in the motor.

View doninvegas's profile

doninvegas

332 posts in 1505 days


#6 posted 934 days ago

All good suggestions, thanks. The bearings seem fine and I can’t detect any bend in the shaft, although I don’t have a dial indicator to be sure. The strange this is that with just a little bit of support under the motor it runs smooth and quiet but when the motor hangs free it shakes. I’m thinking of removing the spring loaded mounting pins and just bolt the motor the mounting support to see if that clams thid thing down.

-- "Courage is being scared to death -- but saddling up anyway."

View knotscott's profile

knotscott

5367 posts in 1973 days


#7 posted 934 days ago

To isolate the problem, try taking the belt off and run just the motor. If it still vibrates you know where the issue is.

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

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doninvegas

332 posts in 1505 days


#8 posted 934 days ago

Thanks, knotscott I’ll try that.

-- "Courage is being scared to death -- but saddling up anyway."

View klw's profile

klw

16 posts in 958 days


#9 posted 934 days ago

Pulleys themselves may be out of balance. Perhaps the tension spring is a bit loose or soft…

Shaft can be checked with a simple jig to hold a small wire or nail up to the shaft as it spins – will give you some idea. The amount isn’t really important – just that fact that it may be bent.

-- I don't remember being absent minded...

View IrreverentJack's profile

IrreverentJack

724 posts in 1440 days


#10 posted 933 days ago

Your saw might have the 2 piece arbor pulley. My 36-979 does. I’ve read complaints about it loosening and causing vibration. -Jack

View doninvegas's profile

doninvegas

332 posts in 1505 days


#11 posted 929 days ago

Here’s what I did today. Took the belt off and fired it up. The motor ran smooth. Put the belt back on and removed the blade and there was a slight vibration but it is livable. Now I’m saying to myself, What the hey. I put the blade back on and the motor jumps all over the place. OK, I got a bent blade. Nope the blade is flat and true. I use the Freud blades and this is about the 10th one I have had on this saw in the past 5 years and I have always had this problem. So, I tried another blade of a different make, same problem. I put a full kerf blade on it that I check for flatness and the motor still jumps. The saw is the Delta 36-979 with the single pully on the arbo rand the nut is tight. I’m really at a lose here.

-- "Courage is being scared to death -- but saddling up anyway."

View ChuckV's profile

ChuckV

2376 posts in 2124 days


#12 posted 929 days ago

Since there is a slight vibration with the belt and no blade, perhaps the arbor is bent. Then when you install the blade, the small arbor wobble is amplified.

-- “That it will never come again / Is what makes life so sweet. ” ― Emily Dickinson

View doninvegas's profile

doninvegas

332 posts in 1505 days


#13 posted 929 days ago

That very well could be. If that is the case then I’ll just have to keep proping up the motor. Bummer.

-- "Courage is being scared to death -- but saddling up anyway."

View ChuckV's profile

ChuckV

2376 posts in 2124 days


#14 posted 929 days ago

doninvegas – Put the belt back on and removed the blade and there was a slight vibration

cr1 – you got no vibration until you add the last element – the blade – and that’s the only time it vibrates

I do not follow.

-- “That it will never come again / Is what makes life so sweet. ” ― Emily Dickinson

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doninvegas

332 posts in 1505 days


#15 posted 929 days ago

It’s very possible that all 13 blades I have either used or just tried are a little off. That and arbor being slightly out of round would cause the motor to jump around. I have used Freud, Delta, DeWalt and Forest over the years but I have always had this problem. When I say slight vibration with no blade I mean you feel the vib. but you can barely see it. I can live with that. After all it is a contrator saw I don’t expect perfection. I agree with cr1, what else could it be but the blade? I’m thinking of removing the spring loaded pins that hold the motor on and bolting the motor to trunoin. If that doesn’t work then I’ll just keep supporting the motor with a stick.

-- "Courage is being scared to death -- but saddling up anyway."

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