Tormek Stones Test archive
Tuesday 1 December 2009
Alan Holtham tests two new grinding stones from Tormek: The SB 250 and SJ 250
Tormek has just introduced two new stones for their sharpening system to deal with the problems of faster stock removal and finer surface finish. I have been a fan of the Tormek sharpening system for some time now, but it has always been used for the final sharpening process. The initial grinding and reshaping of the edge is better carried out on a dry grinder as it is so much quicker than using the standard Tormek stone for significant metal removal. However, I am not entirely happy with this arrangement as dry grinding has the potential to damage the tool and is so much less controllable.
SB 250 on testI started with the SB 250 where the first issue is removing the existing grindstone. Swapping the stones over is straightforward, though if I am going to be doing this on a regular basis it would be nice to have some spanner flats or a Tommy bar hole to grip the spindle as you tighten up. I expected the stone to need dressing
true from new but it actually ran spot on - very impressive. Cutting performance was exactly as claimed, extremely fast, but very controllable with the various jigs and of course no chance of overheating. You can press as hard as you like and the wheel just keeps cutting. The finished surface has obvious grinding lines but you can use the stone grader to dress the stone down to 1,000 grit for a finer finish as you would with the standard stone.