Smoky Mt Woodcarvers used to sell a Video (and still may), by Mel McDaniel on carving pine knots. He used those tiny router bits. I watched that and it scared me. I like sharp tools but that looked plumb crazy to me. If you want the Video, send me your address in a PM and I will get it in the mail to you. I will never watch it again. My interests lie elsewhere.
About your question, the pine knots are obviously full of pitch, however dry it seems. When you hit them with a high speed bit things get a sticky buildup on them in a hurry. I believe that is why Mel used the router bits. Kep the diamonds and rubies away from that stuff. Since those Typhoons come in Fine, Medium, and Coarse these days I think that would be the tool to use. Look at Frank Russells collection at the Foredom site.
http://www.blackstoneind.com/foundat...p?nav=3,21,295
I wouldn't say to buy that set but there are some things in there that you would find handy. By the way, if you are new to Power Carving, you really owe it to yourself to buy the Frank Russell, Power Carving Fur, Fins, and Feathers video. You will learn more there than anywhere else on the planet. He is the premiere power carver and a great instructor. The video quality is very high also. Much to learn there.
Bob