OPTIMUM
M A S C H I N E N - G E R M A N Y
Operation
Version 1.0.1 dated 2015-05-27
Page 37
Original operating instructions
TU3008 | TU3008V
GB
4.9.3
Feed table, table for thread cutting
4.9.4 Transmission ratio
The gear transmission ratio is the ratio of the driving toothed
wheels to the driven toothed wheels.
Example calculation for a thread pitch of 0.75 mm per
revolution with the lead screw.
Thread cutting:
The figure 3 in the above calculation is the pitch of the lead
screw.
The figure 40 is the 1st drive unit, with 40 teeths on the main
shaft of spindle ( shaft lathe chuck).
Z1, Z2, Z3, Z4 and L are the gearwheels to be used in the cor-
responding position.
"C" designates the feed gear.
- Feed gear position “c" transmission ratio = 0.5
- Feed gear position “a" transmission ratio = 1
- Feed gear position “b" transmission ratio = 2
INFORMATION
The transmission ratio of the feed rod (feed) is not
comparable to the transmission ratio of the lead screw
(threading).
The tables are built up in a way that you may later on assemble the
required combination to cut a thread without having to look up the
details. Ligature as orientation for the caming of one toothed wheel
to the following one. The identifier "H" stands for bushing or a small toothed wheel as an auxil-
iary distance. This smaller toothed wheel as an auxiliary distance must of course not be camed
in with any other toothed wheel.
The lowest gearwheel is moved using the spacer (bushing), see position 13 on the parts draw-
ing.
The designation
a b c
of the change gear table designates the position of the selector lever on
the feed gear.
4.10
Cross feed, longitudinal feed engagement lever
ATTENTION!
Damage to mechanical parts. The automatic feed is not designed to move onto
mechanical stops or the mechanical end of the headstock.
The automatic feed and the feed for thread cutting are activated and deactivated using the
engagement lever.
The automatic feed for turning is performed with the feed rod.
The feed for thread cutting is performed with the lead screw.
i = 3 x C x
40 x Z2 x Z4
Z2 x Z3 x L
= 3 x 0.5 x
50 x 80 x 60
40 x 50 x 60
= 0.75
