I use a makita 12" sliding compound miter saw for 99% of the crosscuts I have to make. I've set it up to accurately make 90 degree cuts (theoretically, at least), and I keep it at that setting nearly all the time. I've noticed, particularly on wider boards, that there's just a little bit of variance to how accurately it cuts a 90 degree line (maybe half a degree). I've read that some people feel this is caused by which way the user puts pressure on the handle as he makes the cut, anyone have any test results from fooling around with this?
My goal is to get to where I can consistently use it for accurate 90 degree cuts and not have to resort to a table saw sled and frequent blade changes. Any advice on improving technique or possible tweaks to the saw would be greatly appreciated.
Are sliders inherently less accurate than regular miter saws for this?