Blade alignment problem with my DeWalt 7491rs

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Forum topic by smozes posted 07-21-2016 06:33 AM 1936 views 0 times favorited 2 replies Add to Favorites Watch
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26 posts in 841 days

07-21-2016 06:33 AM

I recently got a the DWE 7491rs job site table saw due to limited space. After a long and frustrating attempt to get the blade parallel with both miter slots, I took it to the local service center. My expectation was to get 0.001” precision.

Today I received it back. The result is that the blade is perfectly parallel with the left slot, but deviates by 0.004” from the right slot. Obviously, it can never be parallel with both.

The service personnel was incredulous by my expectation, and I’ve heard others dismiss job site saws. Of course, a lightweight saw will vibrate and sway more, but I can’t think of an inherent design problem that would preclude basic precision from the machine at rest.

Is this saw defective, or should I adjust my own expectations? I do have to decide soon so I can return it.

For background: I plan to build our kitchen cabinets, remodeling and some furniture later.

2 replies so far

View bbasiaga's profile


1240 posts in 2136 days

#1 posted 07-21-2016 01:15 PM

Most cabinet saws manuals say that .002 is in spec, though can be adjusted to less than that. I have heard that .003 is where you can start to see the effects on the cut edge. Probably depends some on the blade.

.001 for a portable low cost saw is certainly not expected from the factory, but you got there.

As far as the miter slot being out on the right side…I’m not sure that is a huge deal. You can align your fence to the left slot and register your jigs on that side ad well. Yeah, it would be nice if they were both perfect, but you’ll still be able to make great projects with that slot out by .004. If you actually use it, you might not even notice! My rigid portable was off .003. I was still able to use a two runner crosscut sled.

I don’t think you’ll have much better luck in that size and price range. You could try a couple others and see, but I’d guess you’ll return more than one. I really think that one slot won’t be a real limitation for you.


-- Part of engineering is to know when to put your calculator down and pick up your tools.

View johnstoneb's profile


3011 posts in 2314 days

#2 posted 07-21-2016 01:42 PM

You have .002 error if aligned with both slots equally. That is well within tolerance for cabinet saws and you have a low end jobsite saw. Be happy with what you have. .010 is what most manufactures allow for tolerance although most can be adjusted closer with a little patience.

-- Bruce, Boise, ID

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