On 2010-04-15, adsodamelk wrote:
Feed screws:
Tool slide screw is a 6 thread for inch, i think is a acme, isn't it?

Acme is very likely. Trapezoidal threads with a 14-1/2 degree
included angle. Reall old machines were made with square threads, but
Acme is a lot easier to make.

Both table screw, vertical and horizontal are 4 thread for inch.

O.K. 0.250" per revolution for the Y and Z axis.

For the tool slide -- 6 TPI is strange. Not really a convenient
size at all for using an index collar on the hand crank. You wind up
with 0.1666" per revolution.

They are imperial. Bat all assemble bolts and nuts are metric, i'm
sure because i have replace a lot of them.

Which suggests that it was designed and built in a European
country -- and just fitted with Imperial leadscrews where it matters for
producing work to imperial dimensions.

The dial of tool slide is wrong. It say 4,5 mm a turn instead of
4,23 , i.e. 1/6" .

Suggesting that it was designed for metric work, and converted
by a later owner. Perhaps the conversion was because of easier purchase
of the Acme threaded rod in Imperial sizes during a rebuilding. The
original threads may well have been square instead of Acme.

Good Luck,
DoN.

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