LIEBHERR MODEL L-402 HEAVY DUTY GEAR HOBBER

Machine bed with stationary table assembly, table spindle
radial and axial anti-friction roller bearings
Single-start indexing gear, worm wheel of bronze, dual lead worm
Machine main column with infinitely variable hydraulic radial feed,
automatically locked in working position
Tooth depth control via built-in micrometer accuracy +/- .0002"
Scaled trip dog rails for accurate setting of trip dogs
Tailstock column with hydraulically actuated tailstock arm, automatically
locked in working position
Axial feed infinitely variable via SCR-controlled DC drive and pre-loaded
recirculating ball screw
Automatic cycle for climb or conventional hobbing
Rapid travers for all setup motions
All electric motors T.E.F.C.B.B.
Complete hydraulic equipment installed on the machine
Automatic pressurized circulating lubrication with electric pump and filt
er
for all rotating parts
Automatic lubrication for all guideways
EQUPPED WITH CONTINUED
Coolant unit with pump (40 gpm capacity) and tank capacity 80 gallons,
also sliding door splash guards w/safety interlock on splash guard
and gear box door
Machine DC main motor, 11.5 HP for infinitely variable
hob speed, within range specified, using silicon controlled rectifier
located in control cabinet.
Complete electrical control equipment for main voltage 220/380, 3-phase,
50 Hz, w/free-standing control cabinet
Operator control station. Siemens-Allis PC and Siemens controls wherever
possible, wired to VDE 0113 standards
CHEMAPERM chip conveyor with magnetic chip transfer and permanent magneti
c
separator
Equipment for "copy-hobbing/crowning" for hobbing concave, convex, and
tapered tooth forms
Automatic two-cut cycle for roughing and finishing in one operation,
w/automatic change of hob speed and feed between first and second cut
Automatic change of feed directions between cuts, hob speeds, feeds,
and feed direction preselectable on operators panel
Shifting hob-head for axial and radial hobbing w/automatic incremental
hob shift after each work cycle, preselectable in both directions,
w/slide automatically locked during work cycle
Hydraulic clamping device with infinitely variable clamping pressure up t
o
15,400 lbs., mounted below machine table for actuating workpiece
clamping fixture
One (1) hob arbor, hardened and ground, complete with spacers and lock
nut, ASA thread
One tailstock guide bushing for work arbor
Assortment of change gears for index and differential
Work area lamp