Table Saw Flatness

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Forum topic by Kinbaum posted 05-14-2011 04:30 PM 2236 views 0 times favorited 3 replies Add to Favorites Watch
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14 posts in 3215 days

05-14-2011 04:30 PM

I purchased a JET Pro Shop Table Saw with cast iron wings last year and for the most part it has been great. I finally purchased a 50” Lee Valley straight edge and decided to check the flatness of my table saw cast iron top and other tools. The center portion dips roughly 0.025 or 1/40th of an inch. I have read online that this dip in table saws is common. I am not sure if 0.025 is acceptable. I have tried to align the wings as best as I can and the problem still exists. If this is 1/40th of an inch is a problem I am not sure that Jet will replace it because I did not check this when I first purchased the saw.

I just hate spending almost $1000 dollars on a saw that will not give me the accuracy that is needed. I do understand that small errors in woodworking are okay. I know this is not machining work where certain things must be dead accurate. I just want a product that will last me years and not have to worry about accuracy.


3 replies so far

View Sawkerf's profile


1730 posts in 3267 days

#1 posted 05-14-2011 04:44 PM

How did you measure this? How much of that 0.025” came from your measuring setup rather than the table?
Did you “map” the entire top, or was this a single measurement?

-- Adversity doesn't build reveals it.

View Loren's profile


10477 posts in 3846 days

#2 posted 05-14-2011 05:22 PM

That’s within acceptable tolerances for most table saw manufacturers.

It shouldn’t affect the accuracy of your woodworking.

View knotscott's profile


8146 posts in 3574 days

#3 posted 05-14-2011 05:37 PM

No worries. Wood can move a lot, and it would take a sizable deviation to visibly throw off cuts in wood. I no longer even check for small flatness devations on my table saws anymore, other than to shim the wings into the ballpark…any problem with flatness will show itself in the cuts. If after a year you hadn’t noticed in it your work, it should be fine. As Sawkerf points out, it’s pretty easy to mis-measure by that amount too. I suspect that if everyone pursued devations of 0.025”, your $1000 saw would cost twice that in the long run.

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

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