My company just got a used year 2000ish Cincinnati Arrow 1000 VMC with the 2100 control. In th process of getting it up and running, and one thing that I cant understand is why there is only one spindle drive key? There is two cutouts for drive keys but only one of them has a key and the other doesn't even have a tapped hole for adding one. It looks just like this one in the link below. My question is why they would make a machine that only has one drive key. Anyone know?
Cincinnati Saber Arrow 500 CAT40 Spindle | eBay