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TS Blade Parallelism with dial indicator

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Forum topic by Eric posted 1112 days ago 1472 views 2 times favorited 16 replies Add to Favorites Watch
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Eric

185 posts in 1112 days


1112 days ago

I upgraded my benchtop TS to a used contractor saw. I’m using my new dial indicator to true-up the blade. I am able to loosen and true-up the rear trunion in place to within .001. WAYYY good enough for me. However, when I carefully begin to crank the bolts back in, it slips back to about .020 out of parallel.

Tips/suggestions?

It is an older 113.298762 Craftsman.

-- Eric


16 replies so far

View ajosephg's profile

ajosephg

1840 posts in 2162 days


#1 posted 1112 days ago

This is a common problem, and there are several things that could cause it.

Most likely is that the washers between the bolt and the trunnions are dished. Replacing them with hardened washers may solve the problem. Also helps to tighten the bolts in sequence just a little at a time.

The best solution is to install a “PA”L kit.

-- Joe

View GregD's profile

GregD

606 posts in 1737 days


#2 posted 1112 days ago

This was my experience on my contractors saw, even with a PAL kit. Readjust the alignment as you work the bolts progressively tighter. It seems to me that my alignment usually went in a certain direction as I tightened the bolts, so I’d set the alignment to be a bit off in the opposite direction. The problem with that saw was it didn’t take very long before it was again 0.020” out of alignment, so I’d live with it that way and align it right before I had some fussy cutting to do. Over a year ago I upgraded to a cabinet saw which was perfect out-of-the-box and so far has stayed that way.

-- Greg D.

View TomHintz's profile

TomHintz

207 posts in 1999 days


#3 posted 1112 days ago

I had this same issue with an old contractor saw I had. After lots of messing around and several bad words being said I “over adjusted” the trunnion by the amount that it went out when I tightened the bolts and bingo, it pulled itself right into alignment!

-- Tom Hintz, www.newwoodworker.com

View ajosephg's profile

ajosephg

1840 posts in 2162 days


#4 posted 1112 days ago

Oh, I forgot to mention to take all of your measurements with the belt ON and TENSIONED.

-- Joe

View RJweb's profile

RJweb

32 posts in 1233 days


#5 posted 1111 days ago

Greg,
what brand cabinet saw did you purchase, and I guess you are pleaased with it, thx

-- Life Begins @ 190 MPH

View Eric's profile

Eric

185 posts in 1112 days


#6 posted 1111 days ago

Thanlks everyone. I will have to try it again. I did not have the belt tensioned.

When I purchased this saw last week, it was either this one for $75 or a Jet contractor for $200. The Jet did NOT have a miter gauge and when the owner turned it on for me it squeaked and squawked like the bearings where ready to fly. I hope I took the better option.

-- Eric

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ajosephg

1840 posts in 2162 days


#7 posted 1111 days ago

I found out that hard way that you can get it aligned dead nuts, but when you put the belt back on it would pull it off a bunch. Can’t remember the number but it was over 0.005.

-- Joe

View Eric's profile

Eric

185 posts in 1112 days


#8 posted 1110 days ago

Is it typical for my measurement to change as I raise and lower the blade? I think the drag from the belt tension affects the blade to varying degrees depending on blade height.

I know to take the measurements with the blade at full height to get the widest, most accurate measurement, but when I lower it back to typical height, the alignment will have changed.

(I put the dial on the tabletop Delta TS200 cheapy and it is dead on and unwavering to .001)

-- Eric

View Eric's profile

Eric

185 posts in 1112 days


#9 posted 1110 days ago

They were fully tightened when I rolled the blade up and down. The front of the blade stayed mostly true. The rear of the blade changed with the adjustment in height.

-- Eric

View ajosephg's profile

ajosephg

1840 posts in 2162 days


#10 posted 1110 days ago

Is it typical for my measurement to change as I raise and lower the blade? I think the drag from the belt tension affects the blade to varying degrees depending on blade height.

I know to take the measurements with the blade at full height to get the widest, most accurate measurement, but when I lower it back to typical height, the alignment will have changed.

No, I don’t think it is typical, and it should not happen. It must be due to a manufacturing defect on your saw. Probably you are going to have to make a compromise and adjust the alignment at the blade height you use most.

-- Joe

View Eric's profile

Eric

185 posts in 1112 days


#11 posted 1110 days ago

Could this be worn arbor bearings? The guy before me had much too tight of belt on it. Perhaps its time to pass this one on and keep shopping for a saw.

-- Eric

View Eric's profile

Eric

185 posts in 1112 days


#12 posted 1106 days ago

Joe (and others)
I added some grade 8 flat washers to the trunnion bolts. That really helped eliminate movement as I tighten the bolts. I was very pleased to tighten everything down and maintain a .001 differennce.

Then I changed the blade height. :-( Everything went outta wack. There seems to be movement in
the ?worm gear? of my height adjustment. You can see what I mean in this YouTube clip.
http://www.youtube.com/watch?v=ZRAwwn1MbBc

Another thought: If I’m .020 out at the 9” mark on the blade, wouldn’t that mean I’m only .002 out while cutting 1” stock at the 1” mark on the blade? See graphic.

-- Eric

View gillyd's profile

gillyd

136 posts in 1247 days


#13 posted 1106 days ago

I had the same thing happen to me (raising/lowering the blade caused the alignment to run out, causing a safety issue). I ended up returning the saw to grizzly… still waiting on my money back :) Good luck with it, they admitted a defect, so I will be interested to see how yours turns out, I wasn’t able to fix it.

View matt garcia's profile

matt garcia

1816 posts in 2273 days


#14 posted 1106 days ago

I just replaced the bearings on the saw arbor of my Delta contractor saw. I could align mine just fine, but then when I installed the belt, it would cock it out of alignment .010. The new bearings cured the issue.

-- Matt Garcia Wannabe Period Furniture Maker, Houston TX

View ajosephg's profile

ajosephg

1840 posts in 2162 days


#15 posted 1106 days ago

I’ve never checked my alignment at different blade heights. I’ll check it on my saw tomorrow afternoon.

Looks like (youtube video) your alignment is off about 0.016 with the blade at what appears to be max height. What is the MEASURED alignment when the blade is at 1 inch?

Another thing that could affect alignment is running the blade up against the height stop. You should align the blade just short of the stop.

All alignment adjustments/measurements should be made with the height adjustment lock tightened.

I didn’t check your math on your drawing, but your concept is correct. The generally accepted max is 0.005 at full height, so the mis-alignment at 1” height should be nil.

-- Joe

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