What I've learned after years of using a miter saw is that the cheaper they are, the more flex there is in the blade. So as you push the blade into the wood, it slightly moves and doesn't cut the board to the true angle you have it set to. So here is a tip:
Start by making pushing the blade 1/4 of the way through your board. Left the handle and pull it forward making another groove and repeat this process until you are at the end. The start pushing your blade further into the wood in between your first grooves. Last, push all the way through and finish cutting the board.
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Lisa Laker is an interior designer who has been in the design business since 2001. She earned her FIDER accredited Interior Design Degree from IADT in Tampa, Fl and graduated at the top of her class.