MD Indexing and Clamping System

MD Indexing and Clamping System

Indexing system 4x90° (For MD Chuck)
A single hydraulic piston, fed through from the rotating oil manifold and the tube nest, rotates and locks the indexing gear.
This device (tecnomors patent) with only one piston guarantees higher reliability than the two syncronised pistons that other constructors usually apply.

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 = indexing square.
- A2 = rotation square.
- B = indexing and rotation piston.
- B1 = finger
- B2 = locator

These drawings show the different phases of the rotation and of the indexing:

- phase 1 = indexed chuck (pressure in P1).
- phase 2 = turning operation (pressure in P2):
piston B advances and the finger B1 moves the rotation square A2.
- phase 3 = rotation phase completion:
piston B advances,
finger B1 acts on rotation square A2 and determines a rotation of 80°
- phase 4 = indexing (pressure in P1): piston B reverses the movement, locator B2 act on indexing square A1 and completes the rotation of 10° indexing and blocking the head pin.

[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.