How to Test if Your  Sliding Compound Miter Saw  Cuts Accurately
Photo: Michael Chini/Time Inc. Digital Studio
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Check for True: How to Test Cut Accuracy

Straight cuts: Make a 0-degree cut through a stack of two pieces of 1×4, edges to the fence. Butt the cut ends together, with the same edges against the fence. If there's a gap, adjust the saw.

Miters: Make a 45-degree cut through two stacked pieces, edges to the fence. Mark these edges and put them against a square, as shown. The cuts should mate perfectly.
Bevels: Cut a 45-degree bevel through two pieces set on edge, faces against the fence. Form a corner against a square to see if the cuts mate.
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