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Grizzly G0690 Table saw vibration

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Forum topic by chazmclean posted 12-30-2013 02:31 PM 1023 views 0 times favorited 25 replies Add to Favorites Watch
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chazmclean

24 posts in 997 days


12-30-2013 02:31 PM

Topic tags/keywords: grizzly g0690 g0691 table saw vibration question

I upgraded? to a Grizzly G0690 over the holidays from a Ridgid R4512 (a great saw by the way) and finally got it set up and dialed in. I am having a lot of vibration, especially when the motor is first powered up or when i shut it off and the motor spins down. I noticed the belts have a ‘lump’ in them, others refer to this as a ‘set’ or when the belt sits in the same position for a long period. So I noticed an older thread where someone had the same saw (a G0691, same saw with longer fence rails) and had similar, though more severe, issues. The final resolution was switching the stock v-belts (SPZ 625) with link belts. I believe they are 3L cross section (or the metric equivalent) which are 3/8” (10mm) wide instead of the more common 1/2” width, but i can’t find any information on which link belts will fit this saw. Anybody put link belts on their G0690/91?

Thanks,
Charlie


25 replies so far

View knotscott's profile

knotscott

5483 posts in 2042 days


#1 posted 12-30-2013 02:43 PM

Grizzly’s Tech Center should be able to give expert guidance on the belts.

The belts may smooth out a bit after some run time. You can also try rotating the belts a little so that the set is offset a bit for each belt.

I’ve heard that link belts aren’t the best solution for a cabinet saw with triple drive belts. If the stock belts don’t smooth out eventually, you might consider a better rubber cogged v-belt that’s the same size (SPZ 625) instead of a link belt.

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

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chazmclean

24 posts in 997 days


#2 posted 12-30-2013 03:00 PM

Thanks. I used the saw all weekend, and even let the saw run continuously for about 10 minutes (to try to break-in the belts), but it has not made much difference. The lumps are already offset from one another, which is odd.

I have an email into tech support, I have no doubt they will be helpful (they have been great in the past). This is more of a last resort, if the replacement v-belts don’t do the trick.

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knotscott

5483 posts in 2042 days


#3 posted 12-30-2013 03:53 PM

”The lumps are already offset from one another, which is odd.”

Makes me wonder if any of the belts are loose?

It might be worth running the motor in a couple of scenarios to see if you isolate the cause….without blade,then without the belts. If the motor still vibrates with no belt or blade, then it’s the motor.

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

View nwbusa's profile

nwbusa

1017 posts in 952 days


#4 posted 12-30-2013 04:14 PM

Check pulley alignment.

-- John, BC, Canada

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chazmclean

24 posts in 997 days


#5 posted 12-30-2013 04:19 PM

I don’t know how you check the pulley alignment on this saw, as there are 3 pulleys side by side and the arbor is on the one side and the motor on the other. There is no flat surface to run a straight edge to check the alignment, nor do i see an easy way to move the motor or the pulleys horizontally if they were not aligned.

The belts are not loose, but the tension is not the same on all 3, no matter how i tension the motor bracket. I am going to get Grizzly to send me replacement belts and try that first. I like the idea of checking the motor by itself, i will try that also.

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unbob

419 posts in 570 days


#6 posted 12-30-2013 04:33 PM

I can relate my experience with drive belts in these ways.
I will start with the metal lathe in my avatar. That machine is an ultra precision high speed machine 4000rpm. It is critical that it runs dead smooth, or it will produce a poor finish.
The best belts I found are Gates Vextra and Goodyear Matchmaker.
The table saws, I use the same belts, they are worth the few extra dollars.
Belt adjustment….
If, the belts are too tight, the machine will rumble.
If, the belts are too loose, the belts will slap.
Both conditions cause vibration. There is a fine point of adjustment between the two conditions that is just right.
The basic adjustment of deflecting a belt with a finger is only a starting point, it really needs to be further tuned.
Keep in mind when belts warm up they get tighter, due to expansion in cross section is greater then expansion in length, so adjust the belts when warmed up.
Belt set from lumping around the pulleys. When the machine is run, the belts warm up. Then, when the machine is shut down, the belts cool, a set is induce at the pulley locations. To help with that, after cool down, rotate the arbor until the set is off the pulleys, that is, rotate until there is no spring back.
Try those things, it may work for you also.

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bowedcurly

482 posts in 395 days


#7 posted 12-30-2013 05:41 PM

the belt tension has 2 bolts mine was the same way when I bought it, best to take to top off and tension the belts, I tried to tighten mine just on one side bein ignorant of the bolt that I could not see, but that’s me then you can realign your miter slots also

-- Staining killed the wood<<<<<>>>>>Dyeing gave it life

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bowedcurly

482 posts in 395 days


#8 posted 12-30-2013 05:43 PM

if you take the top off you can get equal tension on the belts, after I done this and of course had to replace the bearings after I tightend it on one side, taking the top or cast iron off it’s much easier

-- Staining killed the wood<<<<<>>>>>Dyeing gave it life

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bowedcurly

482 posts in 395 days


#9 posted 12-30-2013 05:45 PM

if you don’t get those belts equal in someway you will be i nstalling new bearings in about a year or less like me

-- Staining killed the wood<<<<<>>>>>Dyeing gave it life

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chazmclean

24 posts in 997 days


#10 posted 12-30-2013 06:27 PM

Curly,
Thanks for the tip. I don’t know if they changed it since yours, but mine has a through bolt that goes through both sides of the motor mounting bracket. I put the wrench on the back side of the bolt to keep it from spinning and pulled straight down on the motor and tightened the nut closest to me. i had to do it a few times to get the belt tensions even (as even as i could). The belt in the middle seems to be the looser of the three. The lumps or set in the belts is pretty significant. I can’t rotate the blade by hand without it popping back into place after i let go. None of my other previous saws had this problem. I am still awaiting a reply from Grizzly tech support….

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unbob

419 posts in 570 days


#11 posted 12-30-2013 06:39 PM

The one Griz machine I have “jointer” came with some not so good belts. They were stiff and not as flexable as quality industrial belts such as Gates.
Grizzly would not be on my list for good belts.

On another note, since the Griz is a copy of the Delta, Delta says not to let the weight of the motor tension the belts, they will be too tight that way. Its possible to have way too much tension on the belts, if pulling on the motor to tension the belts.

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chazmclean

24 posts in 997 days


#12 posted 12-30-2013 06:47 PM

Bob,
I agree, but since this is a brand new machine i want them to try to rectify the problem before I spend money on new belts. BUT, since this may be the ultimate solution if the Grizzly replacement belts don’t work, where did you buy your belts? I have looked up the SPZ 625 belts, which if I understand correctly have a 625 mm length and it appears to be an uncommon size. The SPZ 612 and 630 are much more common. i assume a 5mm difference in overall length would not pose an issue…

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TaybulSawz

133 posts in 349 days


#13 posted 12-30-2013 06:53 PM

I would keep “Bugging” Grizzly to replace the Belts. It’s a NEW saw and NEW Belts should not have a SET in them. They may try and fight it but be persistent and don’t take NO for an answer. They will send you new belts and make you happy. They don’t want dissatisfied customers.

-- Still got all my Fingers!!!

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knotscott

5483 posts in 2042 days


#14 posted 12-30-2013 06:54 PM

Poor quality stock v-belts aren’t isolate only to Grizzly…..the vast majority of stock v-belts from Asian sources, which is most, aren’t very good examples of that type of belt. Within a given lot of the same brand and model, some will be better than others, but in general most experts probably wouldn’t consider them to have very good basic quality. Even if Griz replaces all 3, it doesn’t ensure that you’ve got quality belts. If you’re going to go to the trouble of replacing the original belts, I think it’d be worth your time and even a few extra dollars to upgrade the belts from the get-go.

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

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chazmclean

24 posts in 997 days


#15 posted 12-30-2013 07:02 PM

Scott,
Good point. Any good online sources for said v-belts?

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