Shortcut and Handy Tip
Cutting out Windows and Doors in sheathing is always a chore. If you precut them before nailing on the sheathing, they often need to be trimmed or don't fit properly. I always carry a router with a straight bit for this job. If you look at the bit it has a spiral cutter, to help the cutter stay on course and follow the lumber. It also has a double bearing, which I often spray with Tri-flow or WD40, since they tend to heat up and stop spinning over time. The bit pictured is made by Ocemco. Amana and Velepec also make a straight bit with double bearings. The cut is always perfect and easy to make, except for the sawdust that sprays all over me. Do not try this with a 1/4" shank router bit, use only a 1/2" shank bit. The smaller bits will bend under this type of pressure. I use my old Porter Cable 1 1/2 h.p. router for this job. I own a couple of 3 h.p. routers, but they are just too cumbersome, and the 1 1/2 h.p. works just fine, as long as it is not pushed too hard. Next time you have a window or door cut out, try this technique. You will be pleased with the clean result. Make sure there are no nails or nail heads sticking out for the router to hit. It will shoot shrapnel all over and ruin an expensive router bit.
Posted by The Cranky Codger