Miter saw alignment question

jswift2000March 17, 2014

I have a Dewalt DW716 saw and I have a question regarding squaring/aligning the saw blade. I noticed the saw was cutting slightly off square so I followed the instructions at http://www.thisiscarpentry.com/2010/07/2... to square up the saw (using a Wixey digital protractor as well as various squares). What I found was I can square the left side of the blade to the fence and the table but the right side of the blade only squares to the fence, not the table. On the left side, the blade is 90 degrees to the table and on the right side of the blade the blade is 89.6 degrees to the table. While this doesnt seem like much is showing up in some of my work. I've contacted Dewalt and await their reply but i'm trying to understand what it could be. I'm using the stock blade that came with the saw.

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sombreuil_mongrel

Apparently,the table was not machined flat, or the boss in the housing upon which the table pivots is off. Maybe split the difference? 89.8* on either side? .2* is very small across the depth of cut for the saw.
Casey

    Bookmark   March 17, 2014 at 11:59AM
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jswift2000

Casey - thank you. I'll check the table of the saw for flatness with my level and I will most likely split the difference. I just don't like spending the money on something that isn't right. Oh well. I'll take your advice and see how I get on. Thank you for the recommendation.

    Bookmark   March 17, 2014 at 4:05PM
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HandyMac

I have that same miter saw. I gave up trying to do crown molding miters with that saw long ago. And I have a Freud Ultra Fine (80 tooth) blade plus another cross cut blade along with the stock blade.

My problem was stepped cuts when doing other than 45 degree miters. The stock would move ever so slightly mid cut---creating a gap in the miter. Even only one half would cause the gap. I did a lot of testing---using hold downs/clamps and still had the problem.

What I do instead is cope cut inside corners and use a portable table saw(Porter Cable job site model) and home made adjustable sled/Incra V27 miter gauge for the outside corners.

Coping inside corners takes a bit of time and a couple different files, but it is faster than making three bad cuts. And coped cuts are not affected by humidity/moisture.

I do picture frames miters on my wood shop saw with a sled or the V27 Incra miter gauge.

The DeWalt(had to have the arbor bearings replaces from excess use) is relegated to fencing/decking/etc. It works just great for those jobs.

    Bookmark   March 17, 2014 at 9:03PM
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jswift2000

I don't mind coping. I did fine the fence wasn't straight so I fixed that this morning. I will work on trying to square everything up the evening. If that doesnt work then my father in law is giving me his radial arm saw and I may use that for 'precise' miter work. I would have thought ~$300 would have buy you a quality product. Oh well...

    Bookmark   March 18, 2014 at 1:52PM
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HandyMac

$300 does buy a quality product. But not for making fine fitting miters.

The RAS may well be worse---long arm allows opportunity for a lot of slop.

    Bookmark   March 19, 2014 at 11:06PM
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sombreuil_mongrel

Saw only gets you so far, that's why there are miter planing jigs, and those Lion Miter Trimmers that use a huge razor knife.
Miters are totally unstable "joints" anyway; the angle and fit changes as the wood shrinks or swells; generally useless for widths over 3".
Casey

    Bookmark   March 20, 2014 at 3:44PM
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