Why is my zero clearance insert getting wider? - Woodworking Talk - Woodworkers Forum
 
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post #1 of 12 Old 08-15-2015, 05:45 PM Thread Starter
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Why is my zero clearance insert getting wider?

I've recently purchased a table saw that was used, although it appears to be in great condition. It is my first table saw, and it's a Sawstop contractor model. It came with a new zero clearance insert, and I followed instructions to set it up. Doing that was easy, and the slot that the blade made was skinnier than it is now after doing approximately 25 cuts. I thought this might happen if the blade came loose, but the blade on the saw is certainly tight.

The slot width didn't get wider in all parts, which is why it's easy to see the change. For instance, I was cutting some 1/4" MDF, and had the blade really low, and it seems like that is one of the areas where the slot is wider. The original slot is about 2mm wide, and the wider area is about 2.5 to 3mm wide.

The throat plate itself is not loose or able to wiggle left to right, or front to back for that matter.

What could be the reason why the slot is getting wider? Does the blade ever flex?
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post #2 of 12 Old 08-15-2015, 06:10 PM
where's my table saw?
 
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maybe it's a bum saw?

Could be that's the reason it was being sold? You can check for arbor run out. You Tube has the videos on how.
Often the blade wobbles a bit on shut down, more than when it's under power.

Zero clearance plates generally get a bit wider in normal use, at least mine is, but not by much.

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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post #3 of 12 Old 08-15-2015, 06:15 PM Thread Starter
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Quote:
Originally Posted by woodnthings View Post
Could be that's the reason it was being sold? You can check for arbor run out. You Tube has the videos on how.
Often the blade wobbles a bit on shut down, more than when it's under power.

Zero clearance plates generally get a bit wider in normal use, at least mine is, but not by much.
It cuts really nice, square, and straight. Since you say that the zero clearance plate will generally get a bit wider in normal use, I'll consider this a normal thing.

Thanks for the advice about arbor run out. I'll go check youtube and see what I can find.
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post #4 of 12 Old 08-15-2015, 10:01 PM
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If everything seems tight, I wouldn't worry about it. Fill the slot with bondo, and cut a new slot.
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post #5 of 12 Old 08-15-2015, 10:12 PM
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If everything seems tight, I wouldn't worry about it. Fill the slot with bondo, and cut a new slot.
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post #6 of 12 Old 08-15-2015, 10:41 PM
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I've seen them get bigger from age. The saw cutting more or less sandblasts the edges of the throat plate and erodes the metal away. It's more so if the throat plate is aluminum.
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post #7 of 12 Old 08-15-2015, 10:43 PM
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When you make a cut that taxes the saw and blade. The blade flexes which over a time widens the slot. These blades are thinner now and will flex under pressure.

I second the bondo fix.

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post #8 of 12 Old 08-15-2015, 11:34 PM
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The blade will also oscillate when wood density is uneven or the grain goes mental or when one pushes the wood through the blade too fast. You might consider a stabilizer, thin kerf blades nay vibrate even more.

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post #9 of 12 Old 08-16-2015, 12:48 AM Thread Starter
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Yes, the blade is thinner than 1/8". I know it's a Forrest blade, and the guy that sold me the saw was pretty proud of it. I now suspect that everything is normal, and thank you all for you replies.
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post #10 of 12 Old 08-16-2015, 02:16 AM
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Can you use a larger arbor washer set? There are also dampener disks that will keep the blade more stable.
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post #11 of 12 Old 08-16-2015, 03:15 PM
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I use a stabilizer on my TS. I think it works well and may be the best defense against the thinner blade material.

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post #12 of 12 Old 08-16-2015, 03:16 PM
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Quote:
Originally Posted by Ghidrah View Post
The blade will also oscillate when wood density is uneven or the grain goes mental or when one pushes the wood through the blade too fast. You might consider a stabilizer, thin kerf blades nay vibrate even more.

Good point.

Al


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