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Delta Tablesaw Blade wobble

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Forum topic by optimusprimer92 posted 01-04-2018 11:25 PM 830 views 0 times favorited 13 replies Add to Favorites Watch
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optimusprimer92

38 posts in 584 days


01-04-2018 11:25 PM

Hey all. I have a Delta 36-725 and I have noticed for a while that the blade on my TS wobbles quite a bit at start up and stop for a while but never thought anything of it. Recently I have been unable to get square cuts w/ my crosscut sled and it is driving me insane. I check for square, then unscrew and tap new holes for the back fence and still I am getting slanted edges. Go back to check again and the blade is miraculously out of square again. Realized that part of the blade that I measure off is square when rotated a certain way but when I move the blade forward, a gap of about 1/32” appears while measuring from the same spot. Checked blades (Frued and Marples) with a straight edge and by cutting a low kerf into some plywood and the results are the same: Flat blades but very loose kerfs. This leads me to believe that the arbor or mounting plate is bent. How does this happen and how do I fix it?


13 replies so far

View Rayne's profile

Rayne

910 posts in 1562 days


#1 posted 01-04-2018 11:35 PM

Stupid to ask, but just to cover the bases; did you check the arbor plates to make sure there is absolutely no debris on them to potentially cause the blade to skew?

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optimusprimer92

38 posts in 584 days


#2 posted 01-04-2018 11:57 PM

No problem. Yes, I did and in fact sanded off a tiny bit of blade paint and lapped the removable arbor plate on some sandpaper to make sure it was flat and it was indeed. It is very frustrating trying to cut things square since there is no part of the blade that I can reference off of.

View Carloz's profile

Carloz

1147 posts in 614 days


#3 posted 01-05-2018 12:35 PM

Check the arbor runout with a micrometer.

It appears the arbor runout is quite common with this saw.
https://www.reddit.com/r/woodworking/comments/4auzbp/delta_36725_runout/

View TheFridge's profile

TheFridge

9605 posts in 1508 days


#4 posted 01-05-2018 03:10 PM

Check out woodgears.ca

There is an article posted on how he fixers the wobble in his saw older delta hybrid saw.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

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optimusprimer92

38 posts in 584 days


#5 posted 01-06-2018 11:47 PM

Thanks for the input. I have to wait until next payday to pick up a dial indicator. I can tell right away it is pretty bad. I have tested all my blades with a pencil and can for sure tell the blades are not at fault. I have flattened both the arbor washer and nut to no avail. At this point, I am COMPLETELY unable to get repeatable, square cuts either with miter gauge or crosscut sled. I can get one square about every 10 or so cuts, using the same hand pressure and technique. Frustrating is an understatement.

View Woodknack's profile

Woodknack

11771 posts in 2402 days


#6 posted 01-07-2018 06:52 AM

Runout/wobble will not affect squareness of cuts, only the width of your kerf. You can measure your blade teeth (or look it up on the manufacturer’s website) then measure your kerf and that will give you the amount of runout (or wobble) of your arbor. Also check if the blade is parallel to the miter slots.

-- Rick M, http://thewoodknack.blogspot.com/

View b67mack's profile

b67mack

60 posts in 1442 days


#7 posted 01-10-2018 03:18 PM

I have NO run out on the flange but I see significant wobble as the blade spins down to stop – Now I am thinking its the 3 belts – where can I buy the correct 3 groove clogged belt?

View buckbuster31's profile

buckbuster31

248 posts in 538 days


#8 posted 01-10-2018 03:28 PM

join the club. There was a post about this on woodwhisperer facebook. Just about every single person with this saw experienced it…myself included. I finally got fed up with it and bought a sawstop

View TheFridge's profile

TheFridge

9605 posts in 1508 days


#9 posted 01-10-2018 03:34 PM

Im glad you didn’t experience runout measuring like that but really you should measure 90 deg to the arbor like in the vid rick posted.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View Woodknack's profile

Woodknack

11771 posts in 2402 days


#10 posted 01-10-2018 06:54 PM

Wobble as the blade spins down won’t affect cut quality. Mine wobbles as it does down, when the blade speed hits the saws resonant frequency. It’s just something that comes with lighter weight saws. Did you ever figure out why your cuts are out of square?

-- Rick M, http://thewoodknack.blogspot.com/

View Sark's profile

Sark

74 posts in 383 days


#11 posted 01-10-2018 07:10 PM

Hmm…the arbor shaft could be warped or the arbor itself. I suppose the motor mounts could be loose, too. That’s easy to tighten up and see if it helps. Also, the bearings could be bad, and these can be replaced. But it the arbor needs grinding, and

If you don’t want to pull the whole thing apart and take it to a machinist, you can reface the arbor yourself. Read up on youtube how to do this. I did it to my old contractor saw and it helped a lot.

But after grinding the problem is still there, then you need to think about replacing the bearings.

View MrUnix's profile

MrUnix

6760 posts in 2221 days


#12 posted 01-10-2018 07:11 PM

Wobble as the blade spins down won t affect cut quality. Mine wobbles as it does down, when the blade speed hits the saws resonant frequency. It s just something that comes with lighter weight saws. Did you ever figure out why your cuts are out of square?
- Rick_M

+1

A wobbly blade isn’t going to effect squareness of cut. Judging from the measurements given, sounds like it’s time for a tune-up to bring everything back into alignment.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View ArtMann's profile

ArtMann

950 posts in 838 days


#13 posted 01-11-2018 03:24 AM

I believe that the original poster may not realize that the blade being square with the fence is not all that critical as long as it is fairly close. The important thing is that the sled or fence is perpendicular to the miter slot in which it travels. It is a common misconception.

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