Help newbie understanding quick change gearbox brass tag.

[Ecberry71]

Hello all. I am new to lathes and just bought my first “real” lathe a month ago. I got a 1953 Logan 1922 which is an 11” lathe. I am trying my hand at threading and I cut my first set today and I am happy to report it was mildly successful. They turned out very nicely. However I am having a hard time understanding the brass tag on the gearbox… for instance, if I wanted to cut a 14 TPI thread, my left “gear shifter” should be in the “A” slot, but there is another gear shifter on the right of that one and I don’t see any indication on the brass tag to tell me what that is used for. Ive looked all over YouTube with no success. Can anyone explain to me how to understand this tag on the gearbox? Thank you so much!

 

[dalmatiangirl61]

A pic would help.

 

[johnoder]

The right lever goes under the column with 14 in it - since that is what you wrote you wanted to cut

(and don't try to use the apron clutch - use the half nut lever on right side of apron instead)

Handy dandy generic stuff if needed

http://vintagemachinery.org/pubs/1617/5795.pdf

have fun

Here is a screen shot I captioned

 

[Bill D]

If it is like the one in this picture left lever is in column A. The right lever is in the column clear to the right. Gives you 14 tpi. Move the right lever one place to the left and it is 13 tpi. Move it to the second from right column gives you 12 TPI. etc.
Kind of like reading a times table in math class.
Bill D