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  Digital Catalogue for Technology and Products Development

   Technology and Product Development

    Basic Information

Technology developed: Magnet driven servo mechanism for EDM (TP19762149899)
Category: Technology Service/Know how
Details of Inventor(s):
Inventor Institution/Organization/Company Department Designation
Dr. Vivek Bajpai IIT ISM Dhanbad Mechanical Engineering Assistant Professor
Technical Application Area: Engineering
If 'Other', please specify:
Please give more details of new technical application area:
EDM and micro EDM are performed with the help of controlling the gap between electrodes. This gap filled with a dielectric normally DI water, kerosene or EDM oil. Some times this process done in dry media i.e. normal air or oxygen. The gap and the potential perform EDM process. The current available commercial machines use servo mechanism to control the gap. In the proposed new technology the gap has been controlled by magnetic repulsion force. The basic idea is, a DC power supply is connected with the electrodes and the same DC power supply powered an eclectic magnet. One electrode is stationary and the other one is moving. The moving electrode has a permanent magnet. The permanent magnet is with the contact of electric magnet with same pole. Now if the electrodes are away the electric magnet will push the moving electrode towards the other stationary electrode. As the gap between the electrode reduces the voltage of DC power source will reduce and the electric magnet will be demagnetized. At this situation a spring will pull back the electrode and the electric magnet will magnetized again. During experiments it is found that the system will achieve an equilibrium. In the experiments a 14 volt open circuit DC power was applied and in the equilibrium condition it reduces to 7 to 9 volt. The reduced voltage is equivalent to the gap voltage. Voltage-current characteristics have been recorded and the results are quite impressive. Material removal rate was observed about 80 micro gram per minute, which is much better than existing servo mechanism of EDM and micro EDM. The novelty of the technology is: it will replace the costly servo mechanism and pulse power supply. It is expected that the new technology will be much cost effective than the existing EDM and micro EDM technology.
Indian Institute of Technology (Indian School of Mines) Dhanbad
Affiliated Ministry: MHRD, Govt. of India
Type of technology development: Indigenous
Does the technology help in replacing any import items currently
procured from outside India?
Does the technology have export potential? Yes
Category of Technology developed: Immediate Deployment
Stage of Development: Prototype Level
Please describe in detail including the TRL Level:
The prototype has been developed and it is performing better than the existing mechanism used in EDM and micro EDM in terms of material removal rate.


Applications: Since the developed technology is a replacement of existing EDM and micro EDM process, it can perform everything which an EDM and micro EDM can perform. Electrically conducting materials can be machined irrespective of the hardness. Die making is the major application of EDM process.
Advantages: It will replace the existing technology: The mechanism is very simple. Therefore, no maintenance cost and no highly skilled mechanic is required for repairing. It will replace the current mechanism of servo motion control and pulse power supply. Therefore, the cost will be much lower than the existing system It is a totally new system and never been used

    Technology Inputs:

Imported Equipment/Spare Parts:
Equipment/Spare Parts Year ITC-HS Code
Indigenous Equipment/Spare Parts:
Equipment/Spare Parts Year ITC-HS Code
DC power supply NA
Imported Raw Materials:
Raw Materials Year ITC-HS Code
Indigenous Raw Materials:
Raw Materials Year ITC-HS Code
All scrap of old computer parts have been used NA
Existing R&D Facilities used:
Facilities Year ITC-HS Code
For testing of voltage current characteristics: Oscilloscope has been used. NA

    R&D Investment:

R&D investment (Rs. in Lakhs):                    
Indian Source (Rs.) Foreign Source (Rs.) Year
0 0 NA

   Patents & Publications:

Filed Patents (No.) Granted Patents (No.) Year
0 0 NA
Submitted (No.) Published (No.) Year
0 0 NA

    Commercialization Potential:

Who are the Potential Licensees? All EDM and micro EDM manufacturer
What commercially available products address
the same problem?
Company Product Problem Addressed
syrix EDM and micro EDM electric discharge machining of hard metals
Would you like to develop this invention further with
corporate research support?
Would you be interested in participating in cluster based
programs for commercialization research or business
planning for your invention?
      Submitted by: Sagar Pal Date of Submission: 3-8-2020

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