LIEBHERR MODEL L-252 HEAVY DUTY GEAR HOBBER

radial and axial anti-friction roller bearings
Dual start indexing gear, worm wheel of bronze, dual lead worm
Machine main column with hydraulically actuated tailstock arm, automatica
lly
locked in working position
Tooth depth control by means of 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 DC drive motor and pre-loaded
recirculating ball screw
Differential for hobbing helical gears
Automatic cycle for climb or conventional hobbing
Rapid traverse for all set-up motions
All electric motors T.E.F.C.B.B.
Complete hydraulic equipment installed in free standing unit
BASIC MACHINE CONT
Automatic pressurized circulating lubrication with electric pump and filt
er
for all rotating parts
Automatic lubrication for all guideways
Coolant unit with pump (21 gpm capacity) and magnetic separator, tank cap
acity
45 gallons, also sliding door splash guards
Saftey interlock on splash huard and gear box doors

Standard swivel hob-head with shifting device and counter for intermitten
t
shift, automatically clamped after movement
Automatic two-cut cycle for roughing and finishing in one set-up. Automa
tic
change of hob speed and feed between cuts. Hob speeds, feeds, and feed
directions pre-selectable on operator's panel.
Hydraulic slamping device with infinitely variable clamping pressure up t
o
10,500 lbs., mounted below machine table for actuating workpiece clampi
ng
fixture
DC main motor, ratioa 16 12 HP by 3000 rpm, (6 HP by 1500 rpm), T.E.F.C.
B.B.
for infinitely variable hob speeds, within range specified, using silic
on
controlled recifier
Complete electrical control equipment for main votage 220/380, 3 phase, 5
0 Hz,
with free standing control cabinet and operator's control station.
Chip cart withoil pan and oil return hose to chip conveyor
Assortment of change gears
Hob arbor, hardened and ground with hydraulic lock nut and spacers, 43mm
Tailstock guide bushing for work arbor
Work area lamp
Operator's manual, wiring and hydraulic diagrams