I do a lot of bowl turning and spindle turning with maple and cherry so i have learned how to sharpen my tools with Norton (white) grinding wheels. You need to occasional dress the grinding surface to expose fresh abrasive. the DARK grey grinding wheels are not good for sharpening lathe tools (too coarse).
It is best to have a Wolverine sharpening jig to get a reproducible edge... see attached YouTube link...
great info on how to properly sharpen lathe tools .. Wolverine is a One-way brand made in Canada.. they make high quality turning products