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Table saw ripping out of square

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Forum topic by newwoodbutcher posted 05-28-2020 05:42 AM 521 views 0 times favorited 13 replies Add to Favorites Watch
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newwoodbutcher

813 posts in 3622 days


05-28-2020 05:42 AM

I have a grizzly 691 cabinet saw. I’ve had it about 10 years, it has performed flawlessly. Last week I noticed while ripping, the stock was drifting away from the fence. Turns out one of the nylon adjustment bearings fell out. After I got it back together and pretty well aligned. While ripping 8/4 walnut and found the stock out of square. The tilt was off ever so slightly so I adjusted it and made the cut again, same problem. So I tried another square and sure enough the blade is square to the table but the cuts are not square. Is this even possible? It was getting late so I shut down and will look at it again. Perhaps I’m just dumbed down after a long shop day. Have any of you experienced anything like this?

-- Ken


13 replies so far

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toolie

2185 posts in 3401 days


#1 posted 05-28-2020 11:31 AM

Yup. Sometimes you get so far past the point where the mind works sharply enough to recognize problems it’s best to take a break. The eyes you’ll have when you return usually see things tired eyes don’t see.

-- there's a solution to every problem.......you just have to be willing to find it.

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Robert

3742 posts in 2253 days


#2 posted 05-28-2020 01:38 PM

Jointed face down?

I don’t know any other way this could happen other than a cup in the board & you’re pushing it down against close to the fence. DAMHIKT.

-- Everything is a prototype thats why its one of a kind!!

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hcbph_1

60 posts in 86 days


#3 posted 05-28-2020 02:53 PM

You imply (if I’m reading your statement correctly) the blade is correct to the saw top. By that I assume you mean to the miter slots. How about the fence, is it square to the miter slots?

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Kazooman

1489 posts in 2724 days


#4 posted 05-28-2020 03:18 PM

If I understand correctly, you are saying that the cut face is not perpendicular to the face that was down on the table, even though you have checked that the blade is right on at 90 degrees. Have you checked to see that the face of the fence is also still 90 degrees to the table surface. Perhaps something got out of whack when yo u were adjustment bearing. Are you using a thin kerf blade? If something is out of square you might get a tiny bit of blade deflection, but I think that would be apparent.

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newwoodbutcher

813 posts in 3622 days


#5 posted 05-31-2020 07:24 AM

Thank you all for your responses. This is one of those mystery things that cannot be understood. Today was my first day back in the shop. I picked up where I left off and those three boards I cut were not square. I checked and double checked that the fence, the blade and the slots were all parallel and the blade was precisely at 90 degrees, It all checked out. I didn’t make any changes. I jointed the bad boards and continued with the project. By mid afternoon I needed to make another rip cut off the same 4square Plank and it cut perfectly square, and continues to do so. I have no explanation. However it is really nice to have you all to help me not only on this latest situation but several over the years. You are a great bunch. Thank you again.

-- Ken

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Jim Finn

2836 posts in 3694 days


#6 posted 05-31-2020 12:35 PM

I occasionally have tis problem also. I blame my problem on my pushing technique. Doing something wrong.

-- No PHD just a DD214 Lubbock Texas

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RCCinNC

190 posts in 1099 days


#7 posted 05-31-2020 02:51 PM

Sometimes same “Mystery” occurs to me. Another possibility…internal forces in the wood when ripping causing wood to pull slightly away from the fence? Or just shop gremlins, which occasionally love to mess with our heads…; )

-- Live to putter...putter to live!

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D4me

6 posts in 41 days


#8 posted 06-01-2020 12:37 AM

Extend the saw blade fully. Grab the blade and forceably move it back and forth, then left to right, then pull up then down.

Then do each more gently – any movement in any direction will require looking into.

Then go to the fence and try to move it after being locked down. Same thing. Then check the contact points of the fence and make sure they are not moving on their own (worn out).

Next is to square the fence to the blade using a 2ft or longer metal straight edge (carpenters square will work) and take careful measurements. That’s CAREFUL measurements. You are looking for less than 16ths of an inch, and it better be less, as in as close to zero difference as possible.

This has to be done close to the blade and then as far from the blade as possible in both directions.

If all the adjustments above don’t work – as everything is in tolerance and nothing is moving, then pull out your jack plane and go to work.

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Woodknack

13389 posts in 3152 days


#9 posted 06-01-2020 03:52 AM



Thank you all for your responses. This is one of those mystery things that cannot be understood. Today was my first day back in the shop. I picked up where I left off and those three boards I cut were not square. I checked and double checked that the fence, the blade and the slots were all parallel and the blade was precisely at 90 degrees, It all checked out. I didn t make any changes. I jointed the bad boards and continued with the project. By mid afternoon I needed to make another rip cut off the same 4square Plank and it cut perfectly square, and continues to do so. I have no explanation. However it is really nice to have you all to help me not only on this latest situation but several over the years. You are a great bunch. Thank you again.

- newwoodbutcher

I had the same thing happen last year, my 20 year old saw started tapering boards even after checking and double checking my setup. Then suddenly it stopped. Maybe it was me, maybe it was the lumber, maybe it was the saw bearings starting to wear, no idea.

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

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theart

192 posts in 1327 days


#10 posted 06-01-2020 12:34 PM


Sometimes same “Mystery” occurs to me. Another possibility…internal forces in the wood when ripping causing wood to pull slightly away from the fence? Or just shop gremlins, which occasionally love to mess with our heads…; )

- RCCinNC

When it happens to me, it’s usually due to a little clump of sawdust somewhere that’s keeping the board from sitting tight to the table or fence.

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Nubsnstubs

1723 posts in 2502 days


#11 posted 06-01-2020 01:40 PM

you didn’t mention the condition of your saw blade. Could be dull on one side after hitting something you didn’t notice. Check your teeth tips with a magnifying glass. ............ Jerry (in Tucson)

-- Jerry (in Tucson) www.woodturnerstools.com

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Andybb

2762 posts in 1376 days


#12 posted 06-01-2020 02:55 PM

Another possibility…internal forces in the wood when ripping causing wood to pull slightly away from the fence?

- RCCinNC


+1 That would be my guess also.

-- Andy - Seattle USA

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newwoodbutcher

813 posts in 3622 days


#13 posted 06-01-2020 05:03 PM

Thank you all for responding. The blade is a fairly newly sharpened WWII it’s tight and aligned with the miter slot and fence using an Align It gauge. And was cutting fine all day yesterday. I suppose it could have been wood stresses but cutting additional rips off the same board were fine. Or, it could have been sawdust against the fence. At any rate, the saw is once again performing flawlessly and Lumberjacks continues to be a great resource. Thank you all

-- Ken

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