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H.H. Roberts Machinery Limited
1324 Matheson Blvd E., Mississauga, Ontario, Canada. L4W-2Z7, Fax 905-624-9065
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Pragati logo Pragati Bi-directional CNC tool turrets
Standard tool discs
8 position
12 position
Standard tool holders



VDI tool discs
VDI tool holders
 

TOOL TURRETS
Picture of 3 Pragati CNC lathe turrets
SPECIAL FEATURES

The three piece face gear coupling allows the tool disc to be indexed without lifting. It also ensures high repeat positioning accuracy an rigidity.

The parallel index cam mechanism allows fast and smooth indexing of heavy tool discs. Computer generated cam profiles ensure shock-free indexing action.

Totally enclosed, robust mechanism, with oil bath lubrication.

Electrical elements are conveniently located in a separate area, free from oil and coolant.

Bidirectional working runs in either direction for the shortest indexing time.

Mechanical drawing of Pragati CNC lathe turret

The electric motor drives the cam shaft through a system of gears. Cam shaft indexes the follower shaft through a 'parallel index' drive mechanism. Cam shaft is also geared to the 'drum cam' which controls clamping and release of the 3 piece coupling.

 One revolution of the cam shaft completes one indexing cycle of 'unclamping - indexing - clamping'.

An absolute position encoder gives feedback of the turret position. A proximity switch verifies the clamped position of the turret.

 

Click on a model below for dimensioned drawings and loading capacity
Turret Model  
Version  
Std
Std
Slow
Std
Slow
Std
Slow
Std
Slow
Std
Inertia of Transportable masses kg.m2
15
5
9
3
5
1
2
0.5
0.8
0.25
Total Indexing time for adjacent station
30° on 12 tool turrets
or 45° on 8 tool turrets
sec.
1.0
0.75
1.1
0.6
0.9
0.45
0.55
0.4
0.5
0.25
Indexing Frequency 1/min.
8
12
15
15
15
15
Repeat Positioning Accuracy deg
±2"
± 2"
± 2"
± 2"
± 2"
± 2"
Indexing Accuracy deg
±6"
± 6"
± 6"
± 6"
± 6"
± 6"
Total Weight ( Without tool disk) kg.
245
140
91
58
38
22