Berg Clamping systems Tool Clamping - HSH

Application
For HSC workpiece machining the clamping forces according to DIN 69893 are frequently no longer sufficient. The idea to create an extremely rigid connection between the tool and spindle by placing the clamping element directly against the internal spindle contour, reached its design limits, due to the cross sections and surfaces available for the force transmission. With their HSH-gripper, BERG-Spanntechnik have met the requirements for clamping forces notably exceeding the values specified in DIN 69893. HSH-gripper are intended for the clamping of hollow shank tooling with central cooling lubricant supply.

Design features
HSH-gripper consist of six sturdy clamping claws, which, held by means of an annular spring, execute a tilting movement when the hollow shank tooling is changed and removed. During clamping, the centrally arranged draw-bolt transfers the actuation force onto the clamping segments, where it acts as a direct clamping force without further force deviation. The generously dimensioned face of the draw-bolt has been provided for tool ejection. The constructive design of the clamping element offers a large clamping reserve. The internal spindle contour is easy to manufacture.

GMT REPRESENTATIVE IN INDIA FOR BERG SPANNTECHNIK , GERMANY

Berg clamping systems SK-Steep Taper Tooling

TOOL Clamping systems and release systems Depending on the selected clamping set type and the machine requirements complete clamping and chucking systems are available in combination with the various actuation elements. The following chart is provided for the purpose of allocation and selection. The actuation devices are described and depicted in detail in the specific data sheets. Please contact us for more information for clamping and release systems which are not detailed.

Gripper Clamping cylinder, rotating Multi-energy supply, stationary Spindle speed nmax. <4000 rpm <15000 rpm > 15000 rpm Features / Type ESK OHLK OHL SEK SE Clamping Electrical Hydraulic Hydraulic Mechanic Mechanic Releasing Electrical Hydraulic Hydraulic Mechanic Mechanic Spindle bearing relieved Position control Compressed air supply Cooling lubricant supply

Gripper Clamping cylinder, rotating Spindle speed nmax. > 15 000 rpm Features / Type HDZ HLZ HLZE Clamping Mechanic Mechanic Mechanic Releasing Hydraulic Hydraulic Hydraulic Spindle bearing relieved Position control Optional Optional Optional Cooling lubricant supply Optional Optional Optional

GMT Electro-Mechanical Actuators – U

Electro-Mechanical Actuators – U are meant primarily for use on rotating work spindles where there are restrictions on the use of pneumatic or hydraulic rotating cylinders for the actuation of power chucks, expanding mandrels, collets etc.

It can rotate maximum upto 3000 rpm.

GMT - Electro Mechanical Actuator - UF

Electro Mechanical Actuator - UF have been developed as a time saver for quick and efficient clamping and de-clamping of arbors on machines (milling machines, boring machines etc.) which have steep, self-releasing taper on the spindle. 

Where a number of tools are to be used for an operation, GMT EMA enables the work to be completed in a single set-up. Use of this Electro Mechanical Actuator ensures fast and quick change of tool and cuts non-productive time drastically. Since the operation on the work piece is finished in one set-up, in process inventory is reduced.

History of GMT - Our association with M/S. Techno Valves.

This company manufacture different kinds of non ferrous valves for gas industries. They have a number of ACE CNC Lathes fitted with GMT 2 Jaw Power Chucks. Sometime in Feb 2010 our Mr. Mahendran and Mr. Karthikeyan visited them and met Mr. Rohit Behani, Exec. Mfg. & Sales, Techno Valves and created enquiry for  200 mm dia. Power Operated Power Indexing chuck suitable for ACE CNC Lathe. However, in early July 10 customer decided to order for Mazak CNC Lathe Model Quick Turn Star and asked for fresh quotation for 200 mm dia Power Operated Power Indexing chuck. Mr, Sengupta who retired from LMW as GM and joined Mazak India Kolkatta interacted with GMT. Since he had several interactions with GMT during his tenure at LMW,  he understood the products thoroughly and helped GMT, Techno and Mazak   to initiate discussions and sort out several technical issues viz. dedicated Power Pack for Power Operated Power Indexing chuck, hydraulic and electrical circuit and logic write up ( Interfacing for indexing chuck). The details were sent to Mazak Singapore.  Order for  2B 200 Power Operated Power Indexing chuck complete package including Power Pack and all accessories including special jaws was placed upon us on 17^th Aug. 10.

On receipt of the order further finalization of jaw design took place. We had difficulty in one particular component for offering special jaws. We overcame the difficulty and offered modified jaw design. Received Spindle details and the Chuck with accessories were manufactured. Component trials were done on our LMW Rigi 25 CNC Lathe. The chuck with accessories were dispatched on 20^th Feb. 10.

The Mazak Machine was installed in the new factory of Techno Valves and our team visited on 20^th Apr. 10 to commission the chuck. The chuck successfully commissioned with electrical interface with the Mazak Engineer and our Mr. Kandan. Final trials were taken and obtained report from Techno valves that the chuck is working satisfactorily.

About the author : Shri. K Jagannathan - Executive Director – Sales & Marketing, GMT.
Sri.K.Jagannathan is synonymous with lathe chucks in the Indian machine tool industry. He has been with Guindy Machine Tools for over 5 decades. His vast experience and immense knowledge of workholding products is evident in some of the most complex workholding solutions provided by GMT.  

History of GMT - Our association with M/S. Associated Toolings Kolkatta-2

Early Nov. 08 Associated Toolings decided to repeat the order. This time Associated Toolings informed LMW to order for the total package including hydraulic power pack upon GMT. Machine Rigi 25 CNC Lathe.

Certain improvements were requested by Associated Toolings and LMW details are as under.

• Safety Valve for clamping cylinder. 
• Centrifugal Force Compensating.
• Sensing Unit.
• Interfacing with machine controls.

After a detailed discussions with GMT the above features were incorporated in the design. Offer sent by GMT to LMW,  on 28th. Nov. 08. Order received from LMW on 6th Feb. 09. Chuck was dispatched to LMW on 20-03-09. On receipt of the chuck at LMW our team visited and commissioned the chuck including interfacing with CNC controls so that the machine is capitalised before 31st March 10.

Support and confidence of the customer viz. Associated Toolings on GMT is unique. To this date they continue their support on our products and introduced several of their friends in Kolkatta  who own industries and ancillaries to GMT for Power Operated Hand Indexing chuck and other products. It is a unique relationship.

About the author : Shri. K Jagannathan - Executive Director – Sales & Marketing, GMT.
Sri.K.Jagannathan is synonymous with lathe chucks in the Indian machine tool industry. He has been with Guindy Machine Tools for over 5 decades. His vast experience and immense knowledge of workholding products is evident in some of the most complex workholding solutions provided by GMT.  

History of GMT - Our association with M/S. Associated Toolings Kolkatta.

I met Mr. Karmarkar and Mr. Bishnu of Associated Toolings at HAL Koraput. This was 3 decades back. HAL guest house in those days a meeting point for a number of company executives who visit HAL. At that time Associated Tooling were making Jigs & Fixtures and supplying to HAL.

When I was looking after Sales at Kolkatta I used to visit Associated Toolings regularly and they bought our Cast Iron Surface Plate, Angle Plate, Box Angle Plate and Granite Surface Plate. They set up a machine shop. They purchased Power Chucks from us. They switched over to the manufacture of  Valves and Bonnet. They were regularly buying Power Operated Hand Indexing Chuck.

Early March 2007, they showed interest in our  Power Operated Power Indexing Chuck. After prelimanery discussions and study of their components we recommended 275 mm dia. Power Operated Power Indexing Chuck. We then initiated discussions with Machine supplier viz. LMW. We then sent our offer  to Associated Toolings by end Mar. 07. After a further interaction order for the chuck and other accessories except hydraulic power pack was placed by Associated Toolings upon us by end May. 2007 to be fitted on LMW Rigi 25 CNC Lathe.

We took almost 9 months to supply the chuck. This is due to the fact that during design and manufacture several issues had to be addressed including balancing.The chuck performance was very satisfactory and customer was able to increase his out put of valves due to our chuck.

About the author : Shri. K Jagannathan - Executive Director – Sales & Marketing, GMT.
Sri.K.Jagannathan is synonymous with lathe chucks in the Indian machine tool industry. He has been with Guindy Machine Tools for over 5 decades. His vast experience and immense knowledge of workholding products is evident in some of the most complex workholding solutions provided by GMT.