How can I stop chipping on the edge of the stile when routing? I have a CMT router cabinet with a 3 1/4 HP Bosch router and I am using CMT router sets to make the stiles and rails. There is always some chipping on the edge of the board at the slot for the panel. It is especially bad with oak.
Place some sort of board behind your stile to avoid the splintering as they exit the bit.
One further point to the first writer--I run my stiles and rails through the sander first, to get them all to the same dimension.
Depending on your quantity, you may consider a high-speed steel bit with one of the new high temperature coatings on it.
Dave Rankin, forum technical advisor
A dado cut on a radial arm is climb cut. Done on a table saw, it's a power cut. Which has tearout?
Comment from contributor A:
There seems to be some confusion to some readers about where the tearout is occurring. It is more likely to occur along the edge of the stile (stick) not the edge of the rail (cope). It is more likely to happen with open grain wood, like oak. My suggestion is to first select wood that has the straightest grain. Irregular grain pattern is prone to tear out, especially when cutting against the grain. Cut the stiles and rails to finished width. Cut the rails to finished length. The stiles can be cut either to finished length, or cut over sized and trimmed later. Use a router that is 3 HP or better, and has variable speed.
I agree with using a sacrificial fence placed close to the cutters. Cut the ends of the rails (cope) first. It is best if you use a coping sled or equivalent. Adjust the speed of your router to the router bits manufactures suggested speed. You may need to adjust the speed, depending on the quality of the cut. Cut the rails (ends) with one pass and cut the stiles with one pass. If tearout still occurs, then you may want to score the edge about 1/32 with a light pass with the same bit. You will make two passes. Moving the fence will allow you to make the first cut (score), then move the fence to make the final pass. This should help.