mechanical manufacturing industries is, the conventional machine tools are being given a go by and more and more small as well as medium scale industries have switched over to CNC Machine tools. The CNC Machine tools basically with their higher accuracies and higher rates of production need to utilize more precision component location and clamping systems Our Prime Ministers recent policy guideline “MAKE IN INDIA” makes it all the more important that in order to compete with international manufacturers, the manufacturing Industry should achieve component location and clamping elements of much higher accuracy.


Rotary CONCENTRIC® Hydraulic Expansion Mandrels and chucks are high precision work or too holding devices for true running of work piece for further machining operations, or inspection of concentricity. In case of tool holding, they increase the tool life by about 15 to20% due to true running. Typically, the run out is less than 0.005mm Total Indicator Reading (TIR) in expanded condition. The Hydraulic medium used is a solid Hydro-Plastic Jelly (REX SHU 25) and the CONCENTRIC® mandrel expands with 1 or 2 rotations of a set screw. No external power pack is required. The Hydraulic Medium being solid.



1. Run out before CONCENTRIC® Mandrel Expansion 0.000mm
2. TIR.Run out after Expansion by 0.064mm=0.001mm TIR. Since the acceptable run out limit for a Hydraulic Expanding Mandrel is 0.005 TIR the Mandrel is accepted without any further corrections.

Advantages: High accuracy can be obtained. Better damping effect. Better Concentricity. Longer life with high accuracy than Conventional Mandrels.

свернуть