I discovered this wheel a few weeks ago when I bought a wood lathe and needed to sharpen chisels and shape a piece of high speed steel. I made a 3/4" x 5 3/4" plywood disk with a half inch hole as the base for the diamond blade and laid it together on my 6" bench grinder. I always have some wheel wobble because mandrel disks are cheap stamped steel. I get rid of almost all wheel wobble by inserting paper spacers at the appropriate points between the washer and the plywood rim, much like balancing a car wheel and tire. Since my mill doesn't have a mandrel lock, I use a pair of long bench vices, to hold the mill shaft in place when I tighten and loosen the nut.I bought a really good pair at Harbor Freight for $6 or $7.The shaft lock allows me to lock the washer and plywood washer in a stable position so I can put the spacers exactly where I need them, it's easy to figure out where the spacers go should be decorated. I clamped a block of wood next to the wheel and turned the wheel by hand so that the block touched the wheel at the point of greatest wobble. I then inserted paper spacers between the washer and the plywood disk from the opposite side. It only takes 2 or 3 layers of paper to straighten a circle. I love grinding with a diamond wheel. It works quickly and doesn't heat up the steel as quickly as a wheel and there is little or no risk of the tool exploding. My grinder speed is 3750 RPM, which is more than I prefer, but of course the surface speed of the wheel is slower towards the center, so you can control the metal removal that way.
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