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PostPosted: Mon Feb 15, 2010 2:03 pm 
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I am building an entertainment centre and my TS cuts aren't stright. I am using 3/4" partical board with a melamine finish and I think that is where the problem is. Any other material is fine, so I don't think it is the saw itself. The only thing that I can think of is the blade itself. I tried a different blade (both are used) and still curved cuts. I have resorted to cutting oversize then trimming with a router to get a straighr edge. Any ideas would greatly be appreciated.
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"Shy"

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PostPosted: Mon Feb 15, 2010 3:17 pm 
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Could be a couple things. My first inclination would be to check if the fence is slipping. I've had that happen due to dust build up on the rails. Are you using a feather board to hold the piece firmly to the fence?

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PostPosted: Mon Feb 15, 2010 3:48 pm 
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Hey, Shy! Good to see you again! Hope all is going well for you.

Are you sure it's not cutting straight? Or is it just that it's chewing up the sides of the cut and leaving a jagged edge? You peed a special melamine or plywood blade. I have one made by CMT and it does a great job.

The clock's still running, my friend!! :D :D

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PostPosted: Mon Feb 15, 2010 4:43 pm 
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Not the fence, checked all that many times, plus the curvature is narrower in the center.

Hi Larry, good to hear about the clock. LOL No it is definately not straight. I was going to buy a new blade, but it is a holiday here today..stores closed.

Thanks for your help. I will buy a new blade tomorrow

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PostPosted: Mon Feb 15, 2010 6:17 pm 
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Hey Shy! It's been months.
My first thought was the blade.
Must be one side of the blade found metal sometime or another.
There has been reports of metal in partical board, I believe. :mad:

I have seen the beautiful clock in person. Right after "OLD" what's his name got it. :D

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PostPosted: Mon Feb 15, 2010 9:33 pm 
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Blades will "wobble " when overheated and cut a wider kerf as they wobble. Melamaine is known for having metal in it as well as other "junk" that dulls blades and causes them to over heat and wobble.


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PostPosted: Mon Feb 15, 2010 11:25 pm 
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My gut reaction is that it is extremely unlikely that the melamine is causing the problem.....unless.....the stock isn't square. We all assume that that stuff is perfect when we load it on the truck, but you never know. I'd check two opposite sides to be sure.

Other than that, I'd sure like to hear more about the saw, including dimensions of the top. Is the top flat? Is the blade flat? Is the fence parrallel to the miter slots? Is the blade parallel to the miter slots.

Too many unknows to pop out an answer. Just a lotta questions.

Tell us more. Somebody will hit on an answer.

Joe T

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PostPosted: Tue Feb 16, 2010 8:28 am 
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Thank you allf or your input. The saw is an old Rockwell/Beaver with a 48"cast iron top. I just adapted a Ridgid fence to it so I thought that was the problem, but as I said, other material cuts straight. I will buy a new melamine blade today and let you know.

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PostPosted: Tue Feb 16, 2010 12:46 pm 
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Particle board is rather heavy, so is it possible you are pushing into the fence harder with this material than when you cut other things? If so, fence deflection might still be the culprit. If that's it, a clamp or strong magnet on the table behind the far end of the fence might be a simple fix.


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PostPosted: Tue Feb 16, 2010 5:22 pm 
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Large bulky sheets of ply, particle board, melamine, mdf, ... are large, heavy, and awkward.
I usually cut the sheets down first with a hand held circular saw (with a good appropriate blade) and a straight edge, I have had better luck getting accurate cuts then wrestling them on the table saw.
I have a 50" fence on my table saw.

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PostPosted: Tue Feb 16, 2010 6:44 pm 
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You could take a dial caliper and run it down the miter slot to check everything for square / equidistant.

I think TT wrote an article on that! ;)


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PostPosted: Wed Feb 17, 2010 12:58 am 
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okay I will be the off the wall suggestion


Has the saw been drinking?

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PostPosted: Wed Feb 17, 2010 7:09 am 
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Mango wrote:
okay I will be the off the wall suggestion


Has the saw been drinking?


Its possible because I know Don doesn't like to drink alone!!Image
Ron :D :D


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PostPosted: Wed Feb 17, 2010 8:09 am 
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Thanks all, I bought a new blade, checked and double checked the fence, made some cuts and they were fine Unfortunately, I don'y have any large pieces left to put it through a real test. lol

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