Description

LIEBHERR L-652
Universal Vertical Gear Hobber

Brand : Liebherr
Model : L-652
Universal Gear Hobber, Max 385 Rpm

UNIVERSAL GEAR HOBBER
– This machine is suitable for cutting spur and helical gears, pinions, splines, sprockets, worm gears and other workpieces of similar profile, up to 25.6 in (650MM) diameter

PRINCIPAL SPECIFICATIONS:
– Workpiece diameter: 25.60 in
– Maximum pitch (86000 psi steel): 2.54
– Maximum hob slide travel (standard): 19.7 in
– Work table diameter: 23.2 in
– Max. hob diameter 7.56 in
– Max. hob length 9.84 in
– Master worm wheel, pitch diameter: 22.64 in
– Table bore diameter: 5.512 in
– Minimum distance between hob and table center: 1.97 in
– Maximum distance between hob and – table center: 17.12 in
– Hob spindle speed ranges (infinitely variable): 48-385 RPM
– Axial feed, inch/per/rev. (infinitely variable): .015 in to .354 in
– Radial feed, inch/per/rev. (infinitely variable): .028 in x .55 in
– Rating of main motor: 16 HP
– Floor space required: 186 in x 125 in
– Shipping dimensions: 127 in x 63 in x 122 in
– Approximate net machine weight: 24,700 lbs.

Features & Equipment:
– Machine with automatic rotary work piece loading
– Machine bed with stationary table assembly, table spindle equipped with radial and axial anti-friction roller bearings
Single start indexing gear, worm wheel of bronze, dual load worm

– Machine main column with infinitely variable radial feed, via PC drive & pre-loaded recirculating ball screw, column automatically locked in working position
– Tailstock column with hydraulically actuated tailstock arm, automatically locked in working position
– Axial feed infinitely variable via SCR-controlled DC drive and pre-loaded re-circulating ball screw
– Crown hobbing
– Differential for hobbing helical gears
– Automatic cycle for climb or conventional hobbing
– Rapid traverse 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 filter for all rotating parts
– Automatic lubrication for all guideways
– Coolant unit with pump (40 gpm capacity) and magnetic separator, tank capacity 80 gallons
– Sliding door splash guards
– Safety interlock on splash guard and gear box door
– Seven hob arbors, complete with spacers and lock nut, ASA thread
– Universal hob head for radial, axial and tangential hobbing. Infinitely variable tangential feed via DC drive motor
– Tangential slide automatically locked during axial & radial hobbing cycle.
– Maximum tangential travel 7.87 in .

– Machine equipped with DC main motor, 16 HP, T.E.F.C.B.B. for infinitely variable hob speed, within range specified, using silicon controlled rectifier located in control cabinet

– Complete electrical control equipment for main voltage 470, 3 phase, 60 cycle, control voltage primary 110 AC, secondary 24 DC, single phase. Free standing control cabinet. Operators control station. UL approved

– Large assortment of change gears for index and differential
– Automatic two-cut cycle for roughing and finishing in one operation
– Automatic change of hob speed and feed between first and second cut
– Automatic change of feed directions between cuts. Hob speeds, feeds, and feed directions pre-selectable on operators panel
– Hydraulic table clamping device with infinitely variable clamping pressure up to 22,000 lbs., mounted below machine table for actuating workpiece