gepato,
Mcmaster has some 5/16" 8 2-start acme which you could probably swap in fairly easily. That works out to 4 tpi and should double your speed or better, and still fit your bearings.
You might have to make your own lead nuts. If you get a bit of extra rod, you can make a tap and tap a plastic lead nut. Delrin plastic works well and HPDE would probably work as well.
1/2" bearings are readily available if you want to go to 1/2" acme. There are several popular sizes used in lots of builds here. 1/2-10, 1/2-8, 1/2-8 2-start, 1/2-10 5-start have all been used in Joes 2006 builds. |