Grinder Design Question - Pivot

[gadgetguy9000]

Hello All,

I have decided to explore a DIY grinder, as opposed to buying one. In looking at various designs, there are two primary spring systems for the idler wheel arm: a spring between the pivot and the contact wheel that compresses to release the belt; and a spring behind the pivot that stretches to release the belt. The former is exemplified by the KMG, while several of the Pheer grinders use the latter approach. I am hoping to get insight into the pros and cons of each design.

TIA

John

 

[Stacy E. Apelt - Bladesmith]

If you are building it, use a gas piston spring instead of a spring. place it in front of the idler, like a Bader.
http://www.bladeforums.com/forums/showthread.php/949335-How-to-make-a-KMG-better-(GIB-content-also)
http://www.bladeforums.com/forums/showthread.php/816524-KMG-OEM-Spring-Specs

The ultimate setup is to use a small pneumatic cylinder, a pressure regulator, and a two-way valve to load and unload the idler. You set the belt tension by increasing the air pressure.

 

[gadgetguy9000]

How much travel would you suggest? - Brian's part number appears to be discontinued.