- May 29, 2016
Appreciate you taking the time to walk me through it. I need all the help I can get. I think I understand now (takes me a min or two…). I will follow your suggestions regarding indicating off a parallel to try and narrow in on the source of the error.Sweeping the table by indicating the chuck top off the headstock ( wheel spindle head) might check/show zero-zero but that does not prove the machine will grind a flat part. Checking for bed way condition only a flatness test proves that the fresh ground chuck is truly flat and assures that grinder will grind a long pat flat. *It is different than sweeping the chuck and different from the set gauge blocks on the chuck.
If the chuck after grinding has a slight concave or convex top then sweeping may check dead true but the chuck out of flatness will make a ground part out of flat.
It is good/best to inspect the set pad for flatness and check the chuck top for flatness not with sweeping but with s near true flatness gauge of some sort.
Note that I said the three or four gauge block test is a rough test/ the same as sweeping the chuck is a rough test.
I have seen some of the best name grinders with having this condition and it makes grinding high precision parts a confusing nightmare because grinder hands have difficulty figuring out why part-error occurs.