Indexing System 8x45° (For MDE chuck)
A couple of hydraulic pistons fed through from the rotating oil manifold and the tube nest rotate and lock the indexing gear. This device uses two pistons with a synchronised design - which guarantees high reliability in position.
The main parts of this system are the following:
-A= indexing shaft (driven by two pre-loaded cylindrical roller lines and supported by an axial ball bearing)
-A1 = rotation and indexing square
-B = rotation and indexing piston at 90°
-C = rotation and indexing piston at 45°
-C1 = indexing plane at 45°
The drawing shows the different phases of the rotation and of the indexing:
- phase 1 = indexed chuck at 90° (pressure in P1)
- phase 2 = turning and indexing operations at 45°, piston C advances (pressure in P2)
- phase 3 = C1 plane acts on A1 square, it turns and index at 45°
- phase 4 = turning and indexing operation at 90°, piston B advance (pressure in P1). B1 plane acts on A1 square, it turns and index at 90° (increase of 45° from the previous position)
Indexing precision = 0°01′.
Clamping System
The main parts of the locking device are:
- the closing piston C
- the pilot operated non-return valve A
- the compensating piston B
The rotation shaft enclosed in the clamping piston is driven by two pre-loaded cylindrical roller lines and is supported by an axial ball bearing.
Work system:
- pressure in P3 = clamping piston C
- pressure in P4 = the oil drives the non-return valve A opening that allows piston C opening.
Safety Device:
The chucking piston C is connected to a non-return valve A and keeps the workpiece securely gripped in the jaws even in the event of a complete pressure loss.
Centrifugal force compensation system:
This hydraulic device cuts the clamping power loss that comes to the centrifugal force of the piston and the jaw mass.
During rotation, the pressure created by the clamping piston B and valve action A increases the pressure on the circuit P3 and compensates for the loss of gripping force due to the centrifugal force.