Operating Manual
Tangential Rolling System T18F - T27F
42
Fault Cause Remedy
3 Thread out of
round
Rolling speed too low Rolling speed should not be less than
20 m/min (see Chapter 6.1)
Material not suitable for
cold forming
Change material, if possible
Rolled with overpres-
sure
Reduce blank diameter (see Chapter 8)
Dwell time too short Increase dwell time, do not exceed n
W
< 35
(see Chapter 6.3)
4 Drunken thread Roll sets mixed up by
mistake
Check markings on rolls, set number must
be the same on all rolls (see Chapter 4.3.3)
Rolls assembled in-
correctly in rolling head
See Chapter 5.1.2
Thread starts of rolls
incorrectly positioned to
each other
Gears incorrectly assembled, check position
of pinion tags (roll mount) with checking
gauge (see Chapter 5.1.1)
Workpiece axis not
parallel to roll axis
Workpiece axis not parallel to roll axis
Centre height of roll unit
incorrect
Correct centre height, maximum vertical
tolerance ± 0.5 mm l 0.02 inch
Stroke of cross slide
turret incorrect (rolls
engaged for too long or
not enough)
Check feed movement of slide
(see Chapter 6.2)
Rolled with
overpressure
Reduce blank diameter
(see Chapter 8)
5 Threads on
rolls break off
after short use
Incorrect chamfer angle
on workpiece
Chamfer angle (also – if present – in run-out)
of max. 30° (see Chapter 5.2.1)
Roll sets mixed up by
mistake
Check markings on rolls, set number must
be the same on all rolls (see Chapter 4.3.3)
Rolls assembled in-
correctly in rolling head
See Chapter 5.1.2
Thread starts of rolls
incorrectly positioned to
each other
Gears incorrectly assembled, check position
of pinion tags (roll mount) with checking
gauge (see Chapter 5.1.1)
Stroke of cross slide
turret incorrect
(rolls engaged for too
long or not enough)
Check feed movement of slide
(see Chapter 6.3)
Rolled with
overpressure
Reduce blank diameter
(see Chapter 8)
6
On short lengths
of thread,
heavily tapered
profile at start
and run-out
Too much material
flowing in direction of
axis
Increase diameter at start and run-out end of
workpiece
LMT_Bedienungsanleitung_T18F_T27F_e.indd 42 02.08.11 17:40
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