Messages

Hi,
Both SG-250 and SB-250 will work. The SB-250 Blackstone could be a good investment if you are doing a lot of sharpening of this metal.
Otherwise, use the stonegrader often on the SG-250.

Stickan

You could try to grease the shaft bearings but if that does not help, it could be the motor bearings. Then you should go where you bought it and use the warranty.

I have been sharpening a lot of knives on  the Tormek and the first times this happened to me too.
The thing is, even if the knife is "scary" sharp, you want it to look good. You want that bevel line to be perfect.
On some knives this is tricky but in general, you can sharpen almost any knife with the right technique. 
Jeff Farris shows his technique in this old video, (old because now the jigs are modified and the SVM-100 is now a SVM-140)

http://www.youtube.com/watch?v=fYURcwkKGPs

and if you watch 5 minutes in this movie you will see that he lifts up the knife instead of follows the knives´s curve on the stone.
Doing this you will have a perfect edge bevel.

"Any light shining through between the edge and the cutting board indicates a hollow spot in the blade.  That part of the blade will not cut completely; things like green onions will not be cut through."

Use less time and pressure in the middle of the blade. Requires some practise but then the edge will have a perfect line.
I bought some expensive Japanese knives that came with an convex edge. They were sharp but my wife asked me to sharpen them after 5 days. And off course i did.
On those knives its impossible to feel any difference from convex to concave. I have some other good knives that came with a concave edge and all I do with all my knives is  sharpening once a year and honing 2-3 times a year.

Here it is, you´ll find it "About Tormek" on the web page.

http://www.tormek.com/en/about/index.php

Stig