
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 44
Original operating instructions
TU3008 | TU3008V
GB
4.13
Turning tapers
4.13.1 Turning short tapers with the top slide
With the top slide short cone can be rotated. The scaling is performed up to 60° degree of
angle. It is also possible to adjust the top slide over the 60°- angular mark.
Loosen the two nuts at the left and right of the top slide.
Swivel the top slide.
Clamp the top slide again.
4.13.2 Turning tapers with the tailstock
The cross-adjustment of the tailstock is used for turning long, thin bodies.
Loosen the locking nut of the tailstock.
Unscrew the locking screw approximately half a turn.
By alternately loosening and tightening the two (front and rear) adjusting screws, the tailstock is
moved out of the central position. The desired cross-adjustment can be read off the scale.
First retighten the locking screw and then the two (front and rear) adjusting screws. Re-
tighten the adjusting screws of the tailstock.
ATTENTION!
Check clamping of the tailstock and the
sleeve, respectively for the turning jobs
between the centres!
Tighten the securing screw at the end
of the lathe bed to keep from
unintentionally pulling the tailstock out
of the lathe bed.
Img.4-15:
Lathe bed
4.13.3 Turning of cones with high precision
There are different possibilities to machine a cone on a common small lathe:
1. By twisting the top slide by setting the setting-angle with the angular scale. But there the
graduation of the scale is too inaccurate. For chamfers and conic passings the graduation of
the angular scale is sufficient.
2. By a simple calculation, a stop measure of 100mm length (of your own production) and a
gauge with stand.
Safety screw
Abb.4-16: Designation on the cone
D = large diameter [mm]
d = small diameter [mm]
L = cone length [mm]
Lw = workpiece length [mm]
= cone angle
= setting angle
Kv = cone proportion
Vr = tailstock offset
Vd = measure change [mm]
Vo = twist measure of top slide [mm]
2
GB
d
Lw
L
2