"Jake in Escondido" wrote in message
news:MNNme.27079$Gp.7386@fed1read04...
Here is something I should be able to figure out but can’t. I have a
Sargon model 652 DRO now on my lathe. (It has no numeric key pad). How do
I zero this thing so I can get a direct radius or diameter reading for a
bar I would be turning?

The radius is off by a factor of 2 and the diameter is off by a factor of
4.

Sounds like the resolution might be wrong, I don't know how you would change
it without a keypad. Got the operator's manual?