Hi folks,

I am working my way thru both of my 260's, one is the AT the other ATLH. They both came from the same high school, one is 18709, the other is 19995.

To start I am trying to figure out what end gears were factory original for these machines, stud and screw gears, idler always seems to be 80T. The regular machine has 20/30 stud gear and 40/56 screw gears, the ATLH has 20/30 stud and 40/45 screw gears, both 80T idler. I have found multiple threads about similar topics but couldn't really find what is original and is required so that the lead screw turns correctly as indicated on the gear box feed chart. I looked in the parts manual but it is quite confusing as it doesn't explain what was original, it just states what lathes the gears could have been used on.

I am teaching my son about threading and would like to know the threads we cut are correct.

And....he also likes Japanese cars and has 2 to maintain, so we will need to cut metric as well. I know we are missing the 60/63 gear as well as all of the others needed to cut metric on an imperial lead screw...I'll tackle this metric thing after we get the imperial sorted.

As an aside, is there an actual "instruction manual" for the 260 that I am unaware of? I have the maintenance manual, parts manual and TBOT, which I will re-read, but the TBOT doesn't state you need gear X to go here and gear Y to go here for metric or imperial. I also have looked at the gear charts which came on various models, and it is a bit confusing ( for me anyway)

Here are the 2 gear trains I have, it works and seems okay but it doesn't look like the pictures in the manuals, ie missing a gear.

Cheers and thanks for all the help.
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