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rossetta stone?

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This is on my 1916 Southbend Lathe

any idea of what it is decoding?

1540240806424.png
I am really hoping it somehow is telling me what gears to use and their position to let me cut threads.

now that I have all of these

1540240913580.png
 

Comments

#2
"am really hoping it somehow is telling me what gears to use and their position to let me cut threads. "

You got it!
 
#3
I doubt Rosetta Stone knows that language, but that is your thread cutting gear guide
 
#4
Do what it says, one change gear on the stud, the other on the lead screw. Shows the resulting thread pitch. Intermediate gears do not change the gear ratio, as long as they are not compound gears. Intermediate gears do change the direction of rotation.
 
#5
Best, you find a copy of South Bend's book "How to Run a Lathe" The older an edition the better.
 
#6
Tells you how many teeth each gear needs to cut a given thread.

Screw gear is the gear mounted on the end of the lead screw.
Stud gear is gear closer to the spindle.

Note that cutting 8 TPI requires the same number of teeth on each gear. IE it has an 8 tpi lead screw.
to cut 16 TPI the screw gear has twice as many teeth as the stud gear and so on.
 
#8
This should help the decode.

cg-2.gif
This pic shows a double gear in the change gear position, make sure both the other gears are using the same gear, as said already, the number of teeth do not matter on that gear. Both gears are used in compounding, namely for doing metric gears. Do not worry about that for now.

Google the "How to run a lathe", there is PDF copies all over the internet. Or watch E-bay for the actual books.

Another good site.

http://lathe.com/faq/index.html
 
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