Ayuh,..... I hand sharpened my chains for well over 40 years,....
It's just hard to keep consistent throughout a chain on a 20" bar, on both sides,...
My hand sharpened chains always cut good, But,.....
I bought one of the harbor fright chain grinders, 'n loved the speed, 'n reasonable consistencies,...
But bein' all plastic, tolerances soon faded to distant memories,...
After much searchin' for a steal of a deal, I bought the top of the line Oregon with the hyd. vise,....
So far, so Great,... Love the adjustabilities of it,...
Consistent angles, in every angle of the cut, 'n Consistent tooth lengths,.....
Still learnin' some of the finer points, but my new to me 460 Magnum is now one 'ell of a sawdust machine, even in 4' round hard maple logs,....