Yes, this works well. I've cut pockets and inserted the nut into the side. However, this gear might be to small to accept a pocket and still hold.
I have yes. The gear is not hardened. I believe it is 1020 steel. All I know for sure is it is .2%Have you considered single point threading the gear on your lathe (I assume you have one)? I've threaded small acme nuts by welding/brazing/silver soldering HSS tool bits onto the end of small diameter bars. You need to take light cuts, but it has worked out for me. It will probably also depend on what material that gear is made out of (how tough/hard it is).
Just throwing some thoughts out there,
That's why I'm leaning towards ordering a precision screw with the same fit nut. The nuts come large so you can turn them to your dimension. Is press fitting a nut into a bored hole on the gear considered cobbled together?A for real surface grinder needs a precision lead screw and nut in the Y axis (yes, Y, spindle up and down). You need to be able to accurately raise or lower the spindle a tenth or two at a time. Something cobbled together will give you fits. Of course, not all surface grinders are used for accurate work and that changes things...
can you tell any better from these pics. One is the vertical screw and the other is the cross feed screw.
Not really, the Acme thread form has a 14 1/2 Deg flank angle, a square thread has a 0 Deg flank angle, the difference will be obvious upon inspection. If in doubt an Acme thread gauge is available from McMaster for $23.00 and likely 1/2 as much from other sources.
My guess is that this item has been replaced once already and the piece they started with had the helical already in it.