Setting up Ryobi 12 CMS

[fischermh]

A continuation of my post in the BT forum. I decided to test the accuracy of cutting 90 degree crosscuts on my 12 inch Ryobi CMS(pre laser model) with a 96 tooth DeWalt Series 40 blade.

In the past, I have squared the blade body to the fence. I checked and it was square. I made a cut on a freshly jointed board. The cut was off by 1/2 degree. I turned the table by a half a degree. By doing so, the cut is square, but the blade is not square to the fence. I made sure that there was not any sawdust between the board and the fence.

What is happening?

Thanks,
Mark

[LCHIEN]

that should not be possible. Either something is moving or its static angle is not the same as the dynamic angle.

[fischermh]

Loring,

That is why I am confused. It is repeatable and I don't think anything can move. By dynamic do you mean the blade wobbles?

[LCHIEN]

Static means you are measuring everything while the blade is not in motion. Dynamic (an of course you don't want to be measuring while the blade is moving) means that, for example the torque of the motor and arbor assy moving causes the arbor to bend and be off by a degree.
That's just an example and its unlikely that your arbor is bending. But if what you say is true then something is off.

[fischermh]

Any chance that the the way the teeth are set that they cut at a different angle than the body of the saw blade?

[Jan]

What are you using to check for square? I've tossed a couple of so called squares because they weren't.

[JimD]

You have me a bit worried. I have been thinking of getting the Ryobi 12 inch CMS to replace my Pro-Tech 10 inch CMS - mainly to be able to make wider accurate cross cuts without much effort. Another explanation of your experience is that the bearings of the CMS have enough play that the torque of making the cut is pulling the cut just a tad out of square. Is there noticable play in the arm? Does the thickness of the material or the speed of making the cut affect the angle at all? If not, you could move the detent, perhaps, and have things permanently set up square. If the cut real smooth? With a 96 tooth blade it should be. That would be good news relative to at least the arbor bearings.

Jim

[fischermh]

I have a set of mechanics squares I bought at HF. Probably not the best quality, but I checked their squareness and they are true. Also, from my thinking, if the blade and fence are square using the same square, so should the cut using the same square.

I put another blade on the saw, and it has the same outcome as the first. I am puzzled.

[Wood_workur]

Take the blade off, and try to wiggle the arbor. Does it move?

[drumpriest]

If the arbor is straight, make sure that you are clamping the board securly when making your cut, perhaps it's "walking" on you??