Reply by JesseTutt

Each tool has its place. I have the dewalt 718 miter saw and was suppressed how accurate it is. You still have to have precision tools to check or perform the alignment. You will want to extend the saw to support longer pieces and a measuring system to get repeated cuts of the same length.

When I need to trim a smig off of a piece I will use a stationary belt sander. I use a precision triangle or 45 degree square to set a scrap piece on the sanders table and then I can gently touch the wood to alter it’s angle or remove a smig at at time.

Are your pieces coming up at different lengths causing the miter not to be exact or is it the angle?

-- Jesse, Saint Louis, Missouri