Gear Ratio for QCGB

[benmychree]

If the stud gear is 30, then the screw gear should be 60, or any other combination that gives a 2:1 ratio. correction! it is not the spindle gear that counts, it is the STUD gear that counts, everything that is in between the spindle and stud gear and between the stud gear and the screw gear are considered idlers and do not enter into the overall ratio (I think).

 

[benmychree]

the stud gear is "E", the screw gear is "F", could be 32 and 64 teeth respectively or any other combination that gives a 2:1 ratio

 

[markba633csi]

Yes, I've seen two different versions of this qc Logan and they both have a 2:1 ratio in there

 

[T. J.]

I’m a little late to the party here, but I’ll help if I can. On my lathe (same model as OP’s), the gears are set up as in Campfire’s photo (post #8).

That being said, I would follow benmychree’s recommendation of using the gears you have to get the 1:2 ratio.