Initially sizes 3B 160, 3B 200 and 3B 250 mm dia. were taken up. 3B 250 mm dia. was a very popular size in those days so we started with a prototype of this size. Right from machining process and fixturing for certain machining process spl cutting tools for milling and drilling and using existing machines for machining chuck parts posed several challenges and grim struggle. We overcame all odds and completed the first 3B 250 mm dia. in 1966.
The first chuck was taken personally by PV to Bangalore by car to show to Mr. Grautoff MD Gildemeister who was on a visit. We were working throughout the night and grinding the hard jaws in position. to achieve runout as per standards. Accuracy was no where in sight. Due to continuous grinding gripping serrations in the hard jaws disappeared. Fortunately we had made soft jaws. The chuck was sent with soft jaws.
After PV showed the chuck to Mr.Grautoff, the chuck was brought back to GMT and refitted with a hard jaw and achieved accuracy as per standard. Today GMT is the leading manufacturer of lathe chucks in India!
About the author : Shri. K Jagannathan - Executive Director – Sales & Marketing, Guindy Machine Tools Limited.
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.