Equipment
Gear, Broach, and Finishing Equipment
GEAR HOBBER
MODEL NO. L-301 LIEBHERR HEAVY DUTY HIGH SPEED GEAR HOBBER
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MODEL NO. L-301 LIEBHERR HEAVY DUTY HIGH SPEED GEAR HOBBER

GEAR HOBBER
Manufacturer:
LIEBHERR
Model:
L-301
Year:
1975
Stock #:
2861
MODEL NO. L-301 LIEBHERR HEAVY DUTY HIGH SPEED GEAR HOBBER

This machine is suitable for the cutting of spur/helical gears, pinio
ns, splines, sprockets,
worm gears, and other workpieces of similar profiles up to 11.8" (300
mm) pitch diameter.
Maximum workpiece diameter 11.8" (300mm)
Maximum diametral pitch in steel 3.18 DP (8 module)
Maximum hob slide travel 8.85" (225 mm)
Minimum number of teeth cut 8
Work table diameter 12.4" (315 mm)
Master indexing worm wheel diameter 13.0" (330 mm)
Work table bore diameter 3.15" (80 mm)
Minimum center distance between centerline of hob and workpiece 0.6"
(15 mm)
Maximum center distance between centerline of hob and workpiece 8.45"
(225 mm)
Workpiece clamping height above table surface 6.5" (165 mm)
Longest shaft (workpiece) admitted (measured from table surface)26.8"
(680 mm)
Maximum hob diameter 7.3" (185 mm)
Maximum length of hob 6.7" (170 mm)
Maximum hob shift 5.3 (135 mm)
Maximum incremental shift 0.5 (12 mm)
Hob speed range 60 - 480 RPM
Range of feeds (per revolution of work) Axial Feed High range 0.035
" - 0.250"
Low range 0.009" - 0.063"
Radial Feed (Hydraulic IPM) 0.004" - 0.590"
Approximate weight 13,000 lbs
Machine dimensions 94" x 60" x 85"

MOTOR SPECIFICATIONS

Main drive using Liebherr variable speed main DC motor 6,5 KW, T.E.F.
C.B.B. with silicon
controlled rectifier (fully controlled) located in control panel
Electrical control gear installed for 235/470 volt, 3 phase, 60 cycle
s, AC current, with control
voltage on hinged frame on machine column. All controls American-Klo
eckner-Moeller (of
German manufacture) wired to VDE 0113 German electric standards. Con
trol panel with
operating and indicating instruments. All fuses of US manufacture an
d to JIC standards.
All motors run on both 235 and 470 volt, 60 cycles.

Steady column with hydraulically actuated overhead tailstock work sup
port automatically
locked in working position
Tie bar bolted to machine column automatically locked in working posi
tion
Automatic shifting type hob head 35-47 for automatic intermittent hob
shift after each
hobbing cycle, preselectable in both directions (infinitely variable)
Double start index worm wheel with dual lead worm
Hydraulic device for climb hobbing
Automatic cycle for climb and conventional hobbing
Differential mechanism for hobbing helical gears
Infinitely variable mechanical feed to hob slide and independent, inf
initely variable hydraulic
infeed for work table slide
Automatic two-cut cycle and tooth depth regulation for roughing and f
inishing in one
clamping operation, with hob speed and axial feed preselected and cha
ngeable between the
cuts
Device for hobbing prime numbered gears with constant feed
Copy hobbing attachment for hobbing convex, concave, and tapered teet
h, and "crowning"
to any desired profile
Hydraulic clamping device with infinitely variable clamping pressure
up to 4.800 kp,
mounted within machine table for actuating workpiece clamping fixture
Automatic pressurized circulating lubrication with automatic central
lubrication to the
guideways
Power rapid traverse for all setting motions
One (1) hob arbor 1.25" diameter hardened and ground with spacers and
lock nut
One single set-up of change gears for one operation
CHEMAPERM chip conveyor with 34" discharge height
Complete coolant system with submerged pump/filter
Special splash guard on operator's side, including automatic electric
lock preventing start of
the auto cycle unless splash guard is fully closed , as well as preve
nting opening of splash
guard door during machine's running on auto-cycle
Operators manual, wiring & hydraulic diagrams

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