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I thought it might be worth noting that the Little Machine Shop 40 divisions is meant to make a metric unit lathe emulate an English unit lathe.

They use 1 mm screws (with the exception of the "true inch" mini-lathe version which has 20 tpi screws with 0.050" per turn wheels which I believe is sold exclusively by Micro-Mark).

1 mm is 0.0394".? That is pretty close to 0.040".? So, the 40 division markings are similarly "pretty close."? On the 7x12minilathe group, owners don't seem to complain and tend to say they measure for the final cuts anyway.? And the error is small.? In the case of a mini-mill, I would think things might be worse as sometimes you are traversing a long distance, and many turns of the wheel mean the error will add up.

I saw one mini-lathe (perhaps not one of the Sieg manufactured ones but somebody else's) where the collars were marked in 39.4 divisions.? 39 equally spaced divisions where each really was 0.001" of movement and one last division that was smaller representing that 0.0004" from that 0.0394" value.? So those markings were honest, but confusing.

Charles E. "Chuck" Kinzer