[Cory]

It would help if you clarify what you need.

It sounds like you're saying you need a gear hobbed onto a ball screw. Is that really what you want? That is a highly specialized operation and you're not going to have much luck getting someone to do that for free in a timely fashion.

If you just need to attach a spur gear to a ball screw then you have multiple options, like turning down the screw to fit the gear bore and keying/welding/pinning it.