Between each cut adjust the blade depth so it is deeper by inch.
Cutting a square hole in log siding.
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This not only makes a cleaner cut it also makes the snips easier to use.
Set the depth of the blade to about inch and cut the lap siding in small increments.
Set the block aside and use the knife to carefully cut away the siding along the top and the marked sides.
A rotary tool is the best tool for cutting siding that is already hanging.
The block as a guide mark the vertical cuts in the siding with a utility knife.
Cut the square place the drill with the point of the bit at one inside corner of the square.
Drill and countersink pilot holes for screws in two opposite corners.
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Using the line you scored with the hammer and chisel as your cutting guide use the circular saw to cut along the length of the line.