OPTIMUM
M A S C H I N E N - G E R M A N Y
Version 1.0.1 2014-05-16
Page 122
Original operating instructions
TU2506 | TU2506V | TU2807 | TU2807V
GB
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 in order to prevent the
tailstock from unintentional drawing-out
of the lathe bed.
Img.3-24:
Lathe bed
3.17.3 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.
Calculation
of the offset of the top slide relating to the stop measure with a length of 100 mm.
Safety screw
Abb.3-25: 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
D
d
Lw
L
2
Step by step
by one calculation step (summary)
Example:
D = 30.0 mm ; d = 24.0 mm ; L = 22.0 mm
Kv
L
D
d
–
-------------
=
Vd
100mm
Kv
-------------------
=
Vo
Vd
2
-------
=
Vo
100mm
D
d
–
2
L
-------------------------------------------
=
