How to get clean rail copes?

Dull bits make bad cuts, which sounds a lot like your results. I have never used Pricecutter bits. Small bits cut better @ high speeds and a constant feed rate.

-- waroland, Mount Juliet, TN

before you junk your doors check your bit and make sure there clean, if not clean the resin off of them. you said you have been using mdf, they are very hard on carbide and leave resin, and you can touch up the bits by running the flat side of the bit on a diamond sharpening stone. I would try taking another 1/16th” cut from the rails and use a clean backer board on a sled to cut the cope this should help with the tear out. if you have some scrap try a couple of different speeds to see what gives you the best results. I often keep my stiles and rails a little wide until I cut the copes so I can rip the tear out off if there is any. I also made a nice coping sled like the one in Shop Note and it help a lot with tear out I get very little tear out since I made that jig. oh and if you really think its your bits dull send them out to get them sharpened its cheaper that wasting wood or buying new bits, hope some of this helped

-- Joey~~Sabina, Ohio http://sleepydogwoodworking.blogspot.com/