[Andy A.]

Press fits are a surprisingly complex subject. You are straying into an area where a lot of numbers come into play and assembly technique matters if you want to do things 'right'. If you want to fudge it, I suggest 'skipping' the problem by drilling a .750 hole and using a layer of locktite on the OD of the bearing. As long as you are careful to keep the bearing aligned and the adhesive out of the bearing it works pretty well.

I'm sure some folks here will cringe while reading that, but it does work. Consider it as an option if you don't have access to a shop with a method of cutting a hole of the size you need (jig boring and/or reaming are great ways to do it).

.745 is a good value for pressing this size bearing into aluminum. Different materials and bearing sizes will change that, so don't use it as the cure all. I prefer to stray on the looser side of press fits in FIRST, so I would recommend that you try to keep the tolerance on the hole size positive so the hole will tend to be closer to .750 then not.

As a general practice I don't model press fits in CAD- bearings and their holes are just line to line fits. I'll save press fit instructions as a call out on the drawing and in FIRST I'll also include a table showing the maximum and minimum material conditions for a given tolerance. Opinions on that will very from designer to designer and shop to shop.

Good luck.

-Drew