miter saw problem

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by stripit posted 03-12-2013 02:00 PM 1346 views 0 times favorited 5 replies Add to Favorites Watch
View stripit's profile


25 posts in 2070 days

03-12-2013 02:00 PM

Hi. I have a porter cable compound miter saw, is not used for chopping 2×4 on a job site. I have shop in my garage where I dd small projects . My problem is that the saw will not cut a true 90,. When I cut a wider board (7” to 8”}it leaves a notiiceable hump iin the middle {put it on the table saw and it rocks}. The fence is square to the blade. I replaced oem blade withe a Freud thin kerf blade. still have the problem.

Any body have any suggestions.
Thanks Joel

5 replies so far

View JesseTutt's profile


854 posts in 2137 days

#1 posted 03-12-2013 02:47 PM

I would check the following:

1. blade square with the horizontal table along the entire movement of blade
2. blade square with the vertical fence along the entire movement of blade
3. runout on arbor where blade screws onto saw
4. runout on blade just behind gullets while hand turning blade. Be careful not to push horizontally
5. any wiggle / flex in saw assembly while moving saw

Hope this helps.

-- Jesse, Saint Louis, Missouri

View joeyinsouthaustin's profile


1294 posts in 2099 days

#2 posted 03-12-2013 06:39 PM

Blade is not square to table,(table not fence) as i cuts down the larger material, at a slight angle, it will cut the “cupped” portion of the board shorter than the middle. Even if the board doesn’t appear to be cupped it likely is. A picture of the cut might help. Test the saw with mdf or ply of the same width, and ensure it is flat to table. If the problem persists it is something else.

-- Who is John Galt?

View Loren's profile (online now)


10476 posts in 3674 days

#3 posted 03-12-2013 07:11 PM

The 90 degree bevel stop screw may need a little

View Dallas's profile


3599 posts in 2514 days

#4 posted 03-12-2013 07:31 PM

I think I would try slowing the chop speed first, before anything else.
A thin kerf blade will deflect with the grain if you force it.

You aren’t trying to do framing production so you don’t need speed.

-- Improvise.... Adapt...... Overcome!

View devann's profile


2246 posts in 2719 days

#5 posted 03-12-2013 08:31 PM

Place a straight/flat board on the saw, cutting near the center of the board.
Make a cut.
Rotate/flip one side of the board placing the cut back together.
Look at cut, you’ll be able to determine necessary adjustment.

-- Darrell, making more sawdust than I know what to do with

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics