I'd been having problems drilling 1/2 inch thick steel on a drill press. Only about 1/4 inch deep the 1/2" HSS drill bit would seize or glaze the steel and will cease to drill any further.
The drills were sharpen with diamond disc and sharpen keen to the tip finishing with a 400 grit diamond. Should I be using cutting oil, coolant or a different type of drill bit?
Thanks