LAPPING MACHINES

FLAT LAPPING MACHINES
Achieve positive sealing by obtaining high degree of flatness and surface finish

GMT LAPPING MACHINES
GMT started manufacturing lapping & polishing machine in 1971. It was built for in-house use and until then hand lapping process was used for finishing surface plates. Critical parts for our workholding devices required a finishing and buffing machine. There was demand in the market for valve lapping and lapping plates. Since GMT had a captive ferrous foundry, castings for lap plate and lapping machine were easier to source.

Since then GMT has become one of India’s largest lapping machine manufacturers and suppliers with over 350 installations throughout India mainly to the valve and pump industry. When a buyer in Japan wanted a super finishing machine for lapping large granite plates, GMT designed and supplied a 3000mm dia flat lapping machine.

Pump manufacturers, electronic industries, valve manufacturers, etc., have found a sure way of obtaining positive sealing.

ADVANTAGES OF LAPPING
A wide variety of materials can be lapped.
Flatness to one light band (0.0003 mm) on 100 dia.
Surface finish to less than 0.2 ┬ÁRA.
Some reasons why lapping machines help to transform a costly, rarely used, hand operation to a fine accuracy economical process:-

Parts of different shapes, thickness and material can be lapped.
Because the lap plate continuously maintains its flatness, production is not interrupted.
Appropriate diameters of the conditioning rings result in optimum lapping area.
Lapping cycles are controlled by an automatic and adjustable digital display times.
A partial list of the materials that lend themselves to lapping :

Cast iron
Plastics
Tungsten
Ceramics
Stainless Steel
Aluminium
Bronze
Silicon
Carbon
Alumina
Ferrite
Stellite
MODELS AVAILABLE (LAP PLATE DIA)
300mm and 400mm DIA
610, 900 & 1200 DIA
1500, 1800 and 2100 DIA
ACCESSORIES
300mm and 400mm dia lapping machines are bench models and are robust. The lap plate and conditioning rings are made from special, close-grained, cast iron. The lap plate is supported on a preloaded taper roller bearing for maximum stability.