Re - ground Blacksmith drills

[Philip Davies]

I am seeking advice about some drills I have got, which have not been used since they were re - ground, although their shanks show heavy scarring.

The larger on the left seems to be a slot cutter

The smaller looks as though it is for drilling


But if so, what material?
I should like to experiment with these on a variety of materials (and, yes, I do know that material must be secured firmly)
I do not think that I will use the good keyless chuck on my drill, but will use a spare, but do you think I might damage the spindle if I am too rash?
I have bought a compound table and vice so can move very cautiously and will select the lowest speed at first. I shall start with acrylic, then aluminium and then possibly brass or even steel.

What do you think? As ever, very grateful for your advice.