LIEBHERR L 3002

Listing description

L-3002 LIEBHERR full Universal, Heavy Duty Gear Hobbing, and Milling
Machine suitable for heavy-duty hobbing of external spur & helical gears, pinions, splines,
worm gears, and other work-pieces of similar profile up to 138” (3500mm) diameter, with
motorized hob-head providing a maximum of 40 Module (.5 DP) cutting capability in steel
Serial No. 2301/01 (New in 1981/82 electrical up-grade 2016)
The machine was in storage for a number of years and has seen extremely few hours of actual use. The
machine is in superlative mechanical condition throughout, and has recently been fitted with new
generation electrics, overhauled motors, and programmable logic control for axial and radial feeds, and
selectable fully automatic cutting cycles. The machine features can be described as follows:

EQUIPMENT / FEATURES:
•?Single piece base machine bed including wide, fixed position work-table
•?Single start index worm drive in special-execution, index worm-wheel of special bronze
•?Machine main stanchion with infinitely variable radial feed, automatically clamped
while in working position
•?Programmable hobbing depth; shut-off precision: 0,01mm
•?Hob slide w/steplessly variable mechanical feed drive. Backlash-free drive to hob slide for
conventional or climb hobbing thru preloaded ball-screw.
•?Hob spindle motor (DC) variable speed, geared to 75kW main drive motor
•?Differential mechanism for hobbing of helical gears
•?Universal, heavy-duty hob-head for radial, axial, and tangential hobbing. When hobbing radially or
axially, the tangential slide is automatically clamped. The tangential slide is positioned thru a servomotor,
linked to work-table.
•?Power motorized swivel of hob-head
•?Rapid traverse for axial, tangential, and radial movements
•?Complete hydraulic installation with outboard hydraulic power plant
•?Hydraulic table relieving arrangement
•?Outer support stanchion for work holding bushings. The steady support in hydraulically positioned
and in its uppermost position may be swung out of the way. In working position it is clamped in
place. For workpieces over 1700mm diameter, the outer-support stanchion may be hydraulically
retracted on its sub-base
•?Adjustable “clam-shell” steady-rest type tailstock for support of for the cutting of
heavy pinions in vertical execution
•?Automatic pressure lubrication and oil bath lubrication system
•?Automatic central lubrication for all sliding ways, w/telescoping stainless steel
way-guard covers for axial and radial slides
•?Cooling systems with splash guards, coolant tank capacity: approx. 1,000 liters; delivery: 200
litres/minute

( electrics and control features )
•?Complete electrical equipment installation (all motors professionally overhauled 2016)
(currently arranged for 415 volt, 3-phase, 50Hz operation)
•?New OMRON Trajexia motion controller, CJ2m PLC, and SIEMENS MP277 HMI
with operator’s conversational data input for
control and programming of cycles
•?Free standing control cabinet with new electrical switch-gear
•?Pendant control station with SIEMENS HMI controls for all working elements
•?Conventional, Climb, and Tangential hobbing capability
•?Multi-cut program for the automatic setting of the hobbing depth position and change of hob
speed between No. 1 and No. 2 cut when axial hobbing, including reduction of hob slide travel
for the 2nd
cut, ( programmable for up to five cuts ).
•?Automatic “Single-Index” milling for spur and/or helical gears using disc-type form
milling cutters, or inserted carbide-blade cutters
•?Crowning and taper hobbing via point to point
entry program

( additional equipment )
•?Machine with chip transporting/conveying system
•?Operator’s catwalks alongside the length of the machine and main column
with operator’s stairway
•?Four (4) hob arbors, (1-1/2”, 2”, 2-1/2”, and 3” diameters), hardened & ground,
complete with rings and lock-up nuts
•?Large assortment of index change gears
•?Large assortment of differential change gears
•?Chip transport arranged with permanent-magnetic separator/conveyor
•?28 sets of shoes/wedges for leveling and anchoring of the machine
•?Misc. wrenches, spanners, misc. operator’s tools
•?Full machine documentation, operator’s manuals, wiring, hydraulic, and foundations prints

Max. D.P./Module, when hobbing ............................. .508 DP (40 Module)
when “single-indexing” ................... .508 DP (40 Module)
Max. pitch diameter cut, approx ................................. 138” (3500mm)
Max. hob slide axial travel .......................................... 55.18” (1400mm)
Dia. of table, approx .................................................... 78.75” (2000mm)
Dia. of thru-bore in table, approx ............................... 23.5” (600mm)
Depth of thru bore ……………………………………….. .......... 19.68” (500mm)
Dia. of work table sub-bore …………………………….......... 20.6” (525mm)
Work table sub-bore depth ……………………………... ....... 43” (1100mm)
Dia. of master index worm-wheel, approx .................. 73” (1850mm)
Distance between center-lines of hob spindle
and work-table, maximum ........................................ 86.6” (2200mm)
minimum ............................................ 8” (200mm)
Maximum distance centerline of hob spindle to work
table surface ….………………………………………….. ........... 72.8” (1850mm)
Minimum distance centerline of hob spindle to work
Table surface ............................................................ 17.7” (450mm)
Maximum distance from work table surface to
centerline of work-steady-tailstock …………………… .... 96.45” (2420mm)
Minimum distance from work table surface to
centerline of work-steady-tailstock …………………… .... 58.6” (1490mm)
Dia. x Length of hob, approx ....................................... 18.11”x 23.5” (460 x 600mm)
Tangential travel of hob-slide, approx ........................ 17.75” (450mm)
Hob spindle taper bore ............................................... Metric No. 80
Index constants, w/single start index drive ................ 24 & 72
Hob speeds .................................................................. from 12 to 120 rpm
Max. work/fixture load weight .................................... 55,000 lbs (25 ton metric)
Floor space, approx ..................................................... 72” x 260” (1825x 6600mm)
Max. total power-rating, approx ................................. 90 HP (63 KVA)
Overall height of machine, approx .............................. 150” (3800mm)
Net weight of machine, approx ................................... 95,000 lbs (43 ton metric)

EXTRA: Assortment of hobs and milling cutters (many new)
subject to availability in our stock …………………………... ( upon request )

EXTRA: Service engineer for assistance with machine installation,
set-up and operator’s training at customer’s plant facility… ( upon request )

TERMS: To be discussed

DELIVERY: Machine is available for immediate delivery

This equipment is located in GB