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Delta Hybrid Saw--"Thunking Sound"

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Forum topic by Geedubs posted 06-10-2011 05:05 PM 1621 views 0 times favorited 7 replies Add to Favorites Watch
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Geedubs

143 posts in 2690 days


06-10-2011 05:05 PM

I have a Delta 36-714 tablesaw. Recently I replaced the belt because it had broken and discovered that the pulley had moved on the arbor, creating an unparallel line…and likely causing the belt to break from stress. I have replaced the belt and re-secured the pulley making sure that everything is lined up. However, I now seem to be getting a very slight shudder at the end of the cycle when turning off the motor…and a mild ‘thunking’ sound just before it totally stops. I have checked and everything still appears to be secure and lined up. Any ideas on how to correct this? I don’t think it was doing it before.

-- Todos los dias aprendemos algo nuevo.


7 replies so far

View Lee Barker's profile

Lee Barker

2170 posts in 2311 days


#1 posted 06-10-2011 05:44 PM

Just a couple of suggestions: First, belt tension. Generally specs ask for about a 1” deflection midway between pulleys.

I’m also wondering if your arbor pulley bore is galled from running loose, and so isn’t really true to the shaft.

If you can get a straight edge down there and lay it from flat surface of one pulley to the other pulley and then turn the arbor slowly, you’d find if idea #2 is true.

Thought #3: Cheap belts can have bad splices. A dried up belt can be reluctant to flex enough. The more I think about this, the more I think it could be the belt. You can get segmented belts now at HF; I don’t know if they’re as good as those I’ve purchased at Grizzly. A segmented belt reduces vibration, and that makes for better and safer cuts on the table saw.

Something is awry, it’s just a matter of persistence in finding it.

Kindly,

Lee

-- "...in his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

View knotscott's profile

knotscott

7208 posts in 2836 days


#2 posted 06-10-2011 06:41 PM

IIRC, that saw uses the serpentine style ribbed belt that has propriety pulleys, so a link belt would only work if you replaced the pulleys. It could still be the belt, since that’s a known variable in the equation, but Lee’s thought about some damage to the pulley is worth investigating too.

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

View Loren's profile

Loren

8295 posts in 3108 days


#3 posted 06-10-2011 07:03 PM

My big Delta 20” bandsaw thunks as it coasts to a stop, and slows
down more and stops shortly after the thunking.

I have two theories:

1) The belt is old and lumpy. It certainly is old.

2) It is the motor doing the thunking. Maybe it has a brake in it or
something.

I haven’t studied the issue much and it doesn’t concern me in the bandsaw.

In a table saw I could see how it might be annoying.

View Bertha's profile

Bertha

13003 posts in 2154 days


#4 posted 06-10-2011 07:05 PM

I have the same bandsaw (and same symptoms) as Loren. I had something similar going on in my wetgrinder. In this case, it was a belt that had just “shaped” itself against the pully from disuse. If your belts have been replaced, I’d worry that your pully might be kinked on the axle, like noted above. Good luck!

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

View Geedubs's profile

Geedubs

143 posts in 2690 days


#5 posted 06-10-2011 07:43 PM

Thanks for the advice so far guys. I forgot to mention that I checked it without a blade on and I could not hear the same thing. I tried it with two different blades just in case the blade was the problem…no difference. For some reason it only seems to be happening when a blade is on.

-- Todos los dias aprendemos algo nuevo.

View __Dan__'s profile

__Dan__

1 post in 1663 days


#6 posted 05-21-2012 11:31 AM

Geedubs,

I have the same problem with a used 36-714b I picked up and was wondering if you solved the issue. Did you end up replacing the belt? Pulleys?

Dan

View Geedubs's profile

Geedubs

143 posts in 2690 days


#7 posted 05-21-2012 01:41 PM

Dan, wish I could help you. I was never able to successfully solve the problem. I concluded after various attempted alternatives, that it was most likely something to do with the motor braking when the weight of the plade was included in the action…and that was something I could not figure out a solution to. Ultimately I found the perfect solution: A new Steel City table saw on sale.

-- Todos los dias aprendemos algo nuevo.

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