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12m Granite Surface Plate

Guindy Machine Tools Limited (GMT) recently manufactured and supplied an extra-large sized granite surface plate measuring a whopping 12m in length.

Granite Table for marine crankshaft inspection:

The Story behind this milestone achievement...

Apart from complete range of standard granite and cast iron metrology dimensional inspection equipment, GMT's Metrology Division offers custom built metrology products like large size granite plates and granite base structures for Special Purpose Machines.

It is an acknowledged fact that granite from the Deccan plateau in South India, where GMT’s metrology division is located, is the most suited for metrology. Once the order was placed, experts from GMT visited several quarries in this region to select a single block of granite measuring a minimum of 15m x 2m x 1m. Choosing the stone is a crucial first step in any precision granite product - As granite is a natural material and its properties can vary from vein to vein in the quarry,GMT tested the stone in each site for its properties.

GMT granite surface plate

Finally, they located a single piece of granite suitable for this application. It was then transported to the factory, cut to size and hand lapped by a team of skilled workers to perfection. GMT has supplied thousands of surface plates to the Indian manufacturing industry. This is the largest single piece surface plate manufactured by GMT in the company's 60 years of existence.

Being such a long component, it required supports along the length. These were precision supports which had to support the component without distorting it. GMT also supplied these supports.

These had to be sent to the customer’s collaborator in Europe of approval and then brought back to India for assembly.

The T-Slots were another story…

GMT granite surface plate

The plate was too long to be accommodated within the factory. It was finished in the open air. Once rough finishing was completed, a temperature controlled room was built around it to finish it.

Pull down chuck Pull down chuck Pull down chuck

Once finished, packing and transporting it to the customer was another challenge: Transporting the plate without damage over 550 miles (883 km), parts of the journey over mountainous sections, was coordinated and achieved with the same precision for which GMT is known for its products. The truck reached the customer’s site in record time.

Pull down chuck

“This was a huge achievement for us, experience in the production of metrology equipment over five decades has helped us in this project” explained Jayashree S.Mani, Chairperson and mentor of GMT. “The fact that we were able to achieve plate flatness 50 micron and T-Slot straightness of 10 microns per meter, speaks volumes for our expertise. We are confident to take on such projects with all the QC challenges involved in producing metrology products for inspection of large components, to meet the needs of especially the marine, automobile and other industries requiring very special precision dimensional measurements.”