Operating Manual
Tangential Rolling System T18F - T27F
43
Fault Cause Remedy
7 Poor rolling
results on
workpieces
with thin walls
(pipes)
Remaining wall
thickness too thin for
rolling
Reduce bore or drill after thread rolling.
Place arbor into bore when thread rolling
(see Chapter 7.3)
Stroke of cross slide
turret incorrect
(rolls engaged for too
long or not enough)
Check feed movement of slide
(see Chapter 6.3)
Workpiece bends
through during rolling
operation
Support workpiece
Pipes have non-uniform
wall thickness due to
welding seam or in-
correct pre-machining
Pipe walls must have uniform thickness
(welded pipes are mostly unsuitable for
rolling)
8 Parallel threads
come out
tapered after
rolling
Pre-machined with taper Make sure there is no taper on blank
(see Chapter 5.2.1)
Roll axis not parallel to
workpiece axis
Establish parallelism
(see Chapter 8.2)
Workpiece bends
through during rolling
operation
Support workpiece
Non-uniform bending
apart of axes due to too
strong rolling pressure
Correct axis inclination
(see Chapter 8.2)
9 Gear breakage
or roll driving
claws sheared
off
Rolled with excessive
overpressure
(blank diameter too
large)
Reduce blank diameter
(see Chapter 8)
Axes twisted Axes must always be securely tightened
(part 25)!
Cross slide in travel not
limited by fixed stop
Rolls must not pass beyond center of
workpiece. Set fixed stop
(see Chapter 6.3)
Gears assembled
incorrectly
Rolls must be able to move freely and
smoothly. When holding one roll back, the
other must be able to rotate towards the
inside of the head. This roll must spring back
automatically.
(see also Chapter 5.1.1)
Axes have seized Cooling and lubrication must be sufficiently
available, coolant must be free of chips
(see Chapter 5.2.4).
Workpiece rotations n
W
too low during
rolling operation, resulting in too much of a
force ratio, increase n
W
(see Chapter 6.4)
LMT_Bedienungsanleitung_T18F_T27F_e.indd 43 02.08.11 17:40
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