I've felt no need to slow the Kally 1SM, but I thought it might be fun to play with if I could do it for very few $$$. That however is apparently not the case, so for me the "bang for the buck" is a no-go show stopper.
I suppose it might be helpful for very small pocket knife blades and small scissors. That kind of thing.
Even though the RPM is the same on the Viel as the Kally, 1725 RPM, the Viel grinder runs the belt faster because it uses a 6" drive wheel compared to the 4" on the Kally, so I suspect it quickly produces considerable heat. I'm guessing that is why there is considerable interest in slowing down the Viel. Another less expensive and involved way to go for the Viel would be to just use a smaller drive wheel.
I suppose it might be helpful for very small pocket knife blades and small scissors. That kind of thing.
Even though the RPM is the same on the Viel as the Kally, 1725 RPM, the Viel grinder runs the belt faster because it uses a 6" drive wheel compared to the 4" on the Kally, so I suspect it quickly produces considerable heat. I'm guessing that is why there is considerable interest in slowing down the Viel. Another less expensive and involved way to go for the Viel would be to just use a smaller drive wheel.