The Importance of Wheel-dressing when Surface Grinding is Revealed

[Toolmaker51]

Aside from imperfection of grain distribution in wheels, truing before grind work is very common. Many die shops leave the spindles run all day, but still true before next part.
An uncommon technique was taught by a Romanian grinding master, for sliding parts. With a part to size and surface finish, he'd dress wheel just tenths-worth of dust. With a few strokes of felt pen on part to monitor results, the turning wheel was rapped smartly with a wooden dowel (broomstick). This offset the trued wheel by ~ half the clearance between wheel and arbor. As the table reciprocated, wheelhead was brought closer and closer to the part; approaching last .003, a slip of paper used like a shim. The resulting finish was essentially like handscraping/ flaking, allowing lube or air minimization of friction in the tightest possible sliding fit.
Needless to say, the machine condition was excellent, but not roller ways.