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HMT Machine Tools Limited
location Bellari Road, Bangalore, Tamil Nadu

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Gearbox & Gear Parts

We offer a complete product range of CNC Gear Hobber and High Speed CNC Gear Hobber

CNC Gear Hobber

CNC Gear Hobber
Gear Hobbing Machine H400CNC, with its principle of power transmission from motor to hob through shortest path possible is designed to deal with the static and dynamic requirements that would yield ideal tooth form in spite of interrupted cuts peculiar to hobbing processes.Radial Feed (X-Axis) :- Designed to give more accurate and desired positioning with high precision ballscrew through AC servomotor. Ensures control over size through rotary encoder for positional feed back. Multiple cuts can be programmed enabling to cut gear of higher module (> 8 mm).Axial Feed (Z-Axis) :- AC Servomotor having position feed back through a rotary encoder ensures precise axial feed through ballscrew. AC Servomotor with mechanical fail-safe brake prevents vertical slide inching down during power offpower failure. Optimum cycle time can be achieved by programming higher feed rates during approach and at the end of cut where material removal is less.Tangential Feed (Y-Axis) :- Is through precision ballscrew driven by AC Servomotor and feed back through rotary encoder. Infinitely variable tangential feed is provided in H400CNC 4A and stepped hob shift in H400CNC 3A that enable precise orientation of gear teeth. Stepped hob shift in H400CNC 2A is through hydraulics.

CAPACITY  H400CNC 4A H400CNC 3A H400CNC 2A
Maximum dia of spur and helical gear mm 400 400 400
Maximum module (in Steel 60-70 kgf/mm2) mm 8 8 8
Maximum travel of hob slide mm 300 300 300
Minimum number of teeth that can be hobbed   6 6 6
WORKING RANGE
Dia. of work table mm 400 400 400
Work table bore dia mm 100 100 100
Distance between hob & work axes Shifting hob head (min. / max.) 
Universal hob head (min. / max.)		 mm -- 10/280 -- 10/280 30/300 --
Mounting taper of hob spindle   MT5 MT5 MT5
Hob : Maximum dia. x Maximum length mm 186*180 186*180 186*180
Maximum hob shift
Shifting hob head 
Universal hob head		 mm mm -- 170 -- 170 135 --
SPEEDS & FEEDS
Speeds : AC Servomotor
Feeds infinitely variable in the range Radial feed (X-Axis)
Tangential feed (Y-Axis) 
Axial feeds (Z-Axis)		 rpm mm/min mm/min mm/min   80-480 1-3000
1-325
1-1000		 80-480

1-2000
1-325
1-1000		 80-480

1-2000
-- 
1-1000
POWER
Main Motor - Infinitely variable speed spindle drive - 500-3000 rpm kW 9.0 8.0 8.0
Total connected load kVA 25 25 25
Space requirements & weight
Overall dimension of the machine (lxwxh) m 3.6 x 3.4 x 2.9 3.6 x 3.4 x 2.9
Approximate weight kgf 7000 7000
















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High Speed CNC Gear Hobber

High Speed CNC Gear Hobber
Outstanding static & dynamic rigidity.Powerful main motor.Duplex work & worm wheel for work table drive.Antifriction bearings for work table.Two-start special duplex index table drive.Shifting hob head with CNC axis for hob shifting.Main drive with infinitely variable hob speeds via variable speed AC motor.Differential mechanism.Electronic synchronisation between hob and table rotation (No index and differential change gears).Hobbing of spur, helical, crown, taper and gears having different no. of teeth, module and helix angles in the same set-up.Hobbing of worm gears using both cylindrical and conical hobs.

Workpiece diameter (max.) mm 250
Module (max.) mm 8
Hob slide travel (max.) mm 200
Work table diameter mm 240
Index worm wheel diameter mm 330
Hob diameter (max.) mm 192
Hob length (max,) mm 250
Hob shift (max.) mm 200
Hob speed range through 
AC main spindle drive 
Any two ranges as standard		 rpm
rpm		 120-600
75-375 or 36-180
or 53-265
Distance between hob spindle/table axes - min/max. mm 25 / 185
Axial feed mm/wr 0.1 to 10
Rapid Traverse
X-axis (radial feed) 
Y-axis (tangential feed)
Z-axis (axial feed) 
C-axis (work table rotating) 
B-axis (hob rotation)
A-axis (swivelling)		 mm/min
mm/min
mm/min
rpm
rpm
deg/min		 1600
375
1000
47
120-600
300
Capacity of main motor kW 18
Machine dimension (LxWxH) mm 4600x2710x2230
Weight of Standard Machine kgf 9800
CNC System   Siemens





















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