lathe spindle size

[Will Bradbury]

I recently bought an old atlas/craftsman lathe. I am trying to find a chuck for it and I have measured the spindle which is 1" with 9 tpi. Have any of you heard of this size? I can't find a chuck that size. Or did I count threads wrong. I have found a ton of 1" with 8 tpi. I am away from the house so I can't recount right now. Thanks, Will

 

[Will Bradbury]

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[Gunslinger]

Place your ruler at one of the teeth, that is your 0 point. You do not count that tooth since it is not within the inch. If you do count it then you should get 9 for a 8 tpi. Some people count the valleys between the peaks which would again give you 8 if the peaks start and stop at an inch.
This threw me also before someone explained it to me. Now it makes sense.

 

[Will Bradbury]

That makes sense, now! Thanks alot, Will

 

[aplpickr]

Go to any good hardware store. Buy a 1" x 8 nut for about $2. Take it home and try to screw it on. This is a cheap test and will remove ALL doubt. :gar-La;