PICTURES

SPECIFICATIONS

	CG650	CG650CNC
WORKING CAPACITY
Height of centres on table	650 mm	650 mm
Max distance between centers	6400 mm	6400 mm
Max. distance between self-centring chucks	6340 mm	6340 mm
Swing over table	1300 mm	1300 mm
Max head offset (stroke/2)	350 mm	350 mm
Max diameter admitted on std steady rests	350 mm	350 mm
Max workpiece diameter-new wheel	480 mm	480 mm
Max weight admitted between centers	-	-
Max weight admitted with steady rests	7500 kg	7500 kg
MACHINE SPECIFICATIONS
Z AXIS
Max table speed	0-5000 mm/min	0-5000 mm/min
Resolution (depends from linear encoder precision)	-	0,003 mm
Table motor power	3KW	3 KW
Position measurement system	-	Encoder lineare
X AXIS
Max speed	5000 mm/min	0-5000 mm/min
Max stroke	840 mm	840 mm
Ball screw (pitch x diameter)	10 x 80 mm	10 x 80 mm
Position measurement system	-	Encoder lineare
Hyraulic unit motor power	2,2 KW	2,2 KW
Axis control motor power	-	2 KW
WHEEL UNIT
Diameter of grinding wheel	1300 mm	1300 mm
Max grinding wheel thickness	160 mm	160 mm
Standard grinding wheel thickness	60 mm	60 mm
Min grinding wheel thickness	25 mm	25 mm
Grinding wheel peripheral speed	33 m/s	33 m/s
Wheel rotation motor power	35 KW	35 KW
WORKHEAD
Stepless rotation speed	0-60 RPM	0-60 RPM
Diameter of chucks	450 mm	450 mm
Motor power for heads positioning	0,55+0,55 KW	0,55+0,55 KW
Headstock rotation motor power	5,5 KW + 5,5 KW	5,5 KW + 5,5 KW
LUBRIFICATION UNIT
Operating pressure	4 bar	4 bar
Tank capacity	800 l	800 l
Pump motor power	0,37 KW	0,37 KW

FEATURES

MACHINE BASE
-It is made of high resistance monolithic cast iron,
thermically stabilized.

-It has one flat and one "V" guide.
- Both guides are grinded and wide for the table movement.

TABLE
-Strong structure, thermically stabilized, with scraped surface in order to secure the highest precision of linearity and flatness in the different positions of theworkheads.
-The guideways are covered with special anti-friction plastic material in order to:
reduce the disengaging friction
reduce the coefficient of general friction
reduce the rubbing wear
-Table movement with synchronous servomotor and rack without clearance.
-Table positioning with linear encoders.

WHEELHEAD UNIT
- It moves on wide prismatic guideways
- The grinding wheel spindle rotates by means of a high precision bearings
- The transmission of the motion to the spindle takes places by Poli V belt
- The grinding wheel diameter is 1300 mm and the width can reach n from 40 mm  to 100 mm
- The peripheral rotation speed of the grinding wheel is constant 33m/sec.
- The motor power is of 35KW and the machine can be equipped with a self-balancing system of the grinding wheel

WORKHEADS (HEADSTOCK AND TAILSTOCK)
-Workheads are made of high resistance cast iron
-The workheads-spindle is mounted on two triads of bearings of very high precision.
-The bearings are pretensioned in order to obtain the highest rigidity also in presence of high load.
-The heads can move on the table, they are supported by a pneumatic system (air cushion) for obtaining movement sensitivity and for avoiding table-rubbing wear.
-For crankshaft-balancing, the workheads are provided with slide with proportionate counter- weights.
-Both workheads are supplied with motors with electronic synchronisation.

SETTING-UP AND CLAMPING SYSTEM
The centring of the crankshaft is obtained by means of a special support equipped with three movements that allow solving precisely and easily any problem regarding the work-piece centring:
Opened traditional or CNC controlled steady rest support the crankshaft on the main journals during rod journals grinding
3 or 4 jaws indipendent chuck for crankshaft centering and clamping 
Special pot chucks for clamping specific pieces 
Special rotationg steady rests support the crankshaft on the main journals during rod journals grinding
One offset movement on guides
Zero setting and angular position is assured by pneumatically controlled locking pins.


DRIVES AND CONTROL OF AXIAL POSITIONING
The X and Z axis can be moved either by CNC or manual mode.