Taper Turning With The Tailstock; Turning Of Cones With High Precision - Optimum OPTI turn TU 3008G Operating Manual

4.14.2 Taper turning 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.
Retighten the adjusting screws of the tailstock.
CAUTION!
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 in order to prevent the
tailstock from unintentional drawing-
out of the lathe bed.

4.14.3 Turning of cones with high precision

Abb.4-14: Designation on the cone
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.
Calculation
of the offset of the top slide relating to the stop measure with a length of 100 mm.
Step by step
L
Kv =
D - d
GB TU3008G
38
 2 

L
Lw
100 mm
Vd =
Kv
Translation of original instruction
Lock screw
Img.4-13: Lathe bed
D = large diameter [mm]
d = small diameter [mm]
L = cone length [mm]
Lw = workpiece length [mm]

= cone angle
 2 
= setting angle
Kv = cone proportion
Vr = tailstock offset
Vd = measure change [mm]
Vo = twist measure of top slide [mm]
Vd
Vo =
2
Operation
Version 1.1.6 - 2021-9-17