Oh , yes, very good

Here are a few questions I am pondering...

One of the best features of CNC surface grinders is that once you diamond dress the stone you know the exact height of it above the chuck. Is that information worth preserving for the next session? I'm wondering if the ON/OFF switch should apply a precision brake to the Z screw before cutting the power.

Do I need to seal all the workings dust tight or will the wipers already fitted on the linear bearings and screws suffice?

Do I need to machine the inside of the RSJ flat, to square off the rails, or will the rolled stel consistency compensate for the rolled steel innaccuracy?