LIEBHERR MODEL LC255 HEAVY DUTY 6 AXIS CNC GEAR HOBBER

Two-start indexing gear, worm wheel of bronze, dual lead worm, max.
table RPM (50)
Tailstock column w/hydraulically actuated tailstock arm,
automatically locked in working position
Hob head swivel w/automatic clamping /unclamping of hob head
Separate drives for hob spindle and work table
Ball screws, pre-loaded recirculating for axial, radial &
tangential feed
(cont'd)
Automatic clamping/unclamping of hob arbor, controlled from operator's
panel ("quick-change-hob-system")
CNC full contouring control for 6-axis radial movement, axial
movement, tangential movement, hob rotation, table rotation,
hob head swivel
The electrical synchronization of the generation process, i.e. hob
and table rotation is integrated in CNC system
Helix generation, i.e. linking of axial hob slide movement & table
rotation, as well as tangential hobbing, linking of tangential
movement & table rotation are integrated in CNC system
Copy system for crowing & end relief are part of the CNC system,
i.d. linkage of radial & axial motion. Linear & circular
interpolation, max. radius 328 ft. (100m)
Feeds programmable in mm or inches/table revolution, feeds constant
w/changes in hob speed. When single-indexing, milling, feed in
mm or inch/metric
CNC system, free programmable for individual cycles, input via
keyboard or punch tape
Parametric programming w/90 variable cycles, input via keyboard or
punch tape
Parametric programs for 32 fixed cycles repeatedly used for hobbing
1 cut cycle, 2 cut cycle, with or w/o radial approach, climb or
conventional hobbing with & w/o shifting. Radial & tangential
hobbing. Fixed cycles for crowing & taper hobbing. Programs
include degressive approach.
Software for calculation of approach, overrun & crowning data
(crowning radius & radius location)
CMOS-technique for appx. 100 part programs (components), depending
on complexity of program (3200 char.)
Parallel programming, the ability to program for different
workpieces while the machine is in operation
Data I/O via RS232C connector from or to a peripheral device, such
as tape rad or puncher, magnetic cassette device or data terminal
Single index milling capability included in executive software
Keyboard input for the following parameters
Smallest Increment
Helix angle .0001 deg .0001 deg
Axial travel .00004" .001mm
Radial travel .00004" .001mm
Page 3 of 3
(cont'd)
Smallest Increment
Tangential travel .00004" .001mm
Hob shift travel & step size .0004" .001mm
Axial feed .004"/rev .1mm/rev
Radial feed .0004"/rev .01mm/rev
Tangential feed .0004"/rev .01mm/rev
Hob RPM 1 1
Hob head swivel angle .05 deg .05 deg
Electronic handwheel for manual control of the machine (any
linear axis & table rotation controlled)
Misc. functions (M-functions) coolant on/off, workpiece
clamping/unclamping, overhead work support up/down
Diagnostics capability w/faults displayed on CRT w/faults
monitored for P.C. controller, AC Servo motors,
rotational relationship, emergency stop, etc.
Automatic lubrication for all guideways
Automatized pressurized circulating lubrication w/electrical
pump & filter for all rotating parts
Coolant unit w/pump (27 gpm cap.) and CHEMAPERM magnetic
chip conveyor tank capacity of 45 gal.
Splash guard w/automatic electric lock
Motorized hob head for radial, axial & tangential hobbing,
hob slide automatically clamped during axial & radial
hobbing. Equipped w/automatic increment hob shifting
preselectable in both directions.
Hob head w/"quick-change" arbor feature/option
Machine equipped w/DC main motor, hob head mounted, 13 HP,
for infinitely variable hob speed
Hydraulic clamping device w/infinitely variable clamping
pressure up to 10,400 lbs mounted below machine
Adjustable tailstock
Equipment for skive hobbing of pre-hobbed & hardened gears
Complete electrical control equipment for main voltage
220/380, 3 phase, 50 cycles
Work area lamp
This machine qualifies for a 1 year limited warranty at additional cost.