Found out, I have the infamous concave miter saw table.

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Forum topic by Holbs posted 02-12-2018 04:35 AM 239 views 0 times favorited 3 replies Add to Favorites Watch
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1819 posts in 1961 days

02-12-2018 04:35 AM

I have the older Bosch double compound miter saw 12” (I forget the model). It’s not a slide or axial. For a long time, I have done accuracy test cuts on short boards with the use of a dial caliper, they always came out 0.001” area of perfection. Yet, when I cut a long board for 24” or 36”, the cut is not square. I always thought it was me but now I found out, the rotating table is not flat. The edges of the rotating table are higher than the infeed/outfeed tables and center of table by 1/16”-1/32”, enough to where when I use a square on a long piece, the cut is not square.
And this is a very popular problem with most miter saws. Some, use pieces of tape to raise the infeed/outfeed table height, some have the opportunity to send the new miter saw back. I could go the paper or tape route to make things level all the way across, but got to thinking. Has anyone with this issue tried to level the rotating table flat? I believe, the table is aluminum. With some sanding belt paper of 6”x48”, I might give this a shot.

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter

3 replies so far

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2467 posts in 521 days

#1 posted 02-12-2018 05:21 AM

Sounds tricky. I’d be more inclined to go at it with some sandpaper glued to a piece of 3/4” MDF. Nice and flat, and you can use Scotch 77 or something like that to attach the sandpaper without any bulges.

-- No matter how much you push the envelope, it'll still be stationery.

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1819 posts in 1961 days

#2 posted 02-12-2018 05:30 AM

I stand corrected. I went further down the rabbit hole with dial caliper and height gauge. The circular rotating table top is actually not too bad and acceptable (less than 0.01”) so while it is slightly concave, it’s good enough for wood working purposes. However, the entire top is higher than the infeed/outfeed support by 0.035”. This is the problem because this explains why short (less than 6” long) pieces come out square but long pieces come out of square due to the raising of the angle at the blade.

For temp purposes, probably will go layering paper on the infeed/outfeed tables to make things coplanar. In due time, I might disassemble and find out what I can shave off some 0.035” somewhere under the rotating table.

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter

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4121 posts in 2340 days

#3 posted 02-12-2018 05:33 AM

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