Need help with saw setup

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OK so this is the second chop saw I have had and I cant get a true 90, 45, etc degree cut, so it has to be something I am doing with my setup.In the past I have set it up using a protactor, not the degree "dial" inidcated on the guide/clamp - that thing is off.  I also make sure that the material is level with the table portion of the saw so that there is no slant in the cut caused.  Better, but still off.The only thing I can figure (if it is not me) is that it may be the cut wheel.  I am using Sait wheels, and I have noticed that when the wheel initially spins it flexes and I need to give it about 3 seconds to calm down and straighten up for a good vertical cut.  I have noticed other wheels doing the same thing, so it is not unique to them.The saw is on the shop floor.  The back end of the metal is supported by another piece of metal that is equal to the height of the clamp/table on the chop saw.Any advice you have on this would be greatly appreciated.  Thanks.
Reply:Chop saws that use an abrasive blade are known for their blades flexing during the cut.  They are nice for some things but I don't expect nice cuts from them.  I bought a dewalt multi cutter that has a carbide blade and love it, true and clean cuts with little heat and mess.
Reply:I get good cuts 45 & 90 from my Dewalt Chop saw.The key is to make sure that you position the work in the Vise so that the Blade comes down on center. You'll have to adjust the vise as the blade wears down to keep the blade on center.Ed Conleyhttp://www.screamingbroccoli.com/MM252MM211 (Sold)Passport Plus & Spool gunLincoln SP135 Plus- (Gone to a good home)Klutch 120v Plasma cutterSO 2020 benderBeer in the fridge