Meets High Torque & Temperature Requirements, Saves Assembly Costs

Pragati Automation, India manufactures Machine Tool accessories. They assembled torque motors for Bio-Directional Tool Turret, where very high torques are induced. During the assembly, the Rotor was heat shrink fit on to the shaft and Stator was heat shrink to housing with high interference. These motors develop temperatures of 120 deg C continuous. Shrink fit of assemblies involves – heating costs and time, additional labor and still lower reliability and customer wanted to improve on these.

Augments Strength and Adds Reliability

Mehala Machines is a manufacturer of garment sewing machines in India. Mehala’s High-speed Integral Clutch Motors used in Sewing Machines had their rotors (silicone steel) fixed to shaft (En8) with interference press fits. The interference press fits hold the assembled parts together with friction and are expected to have high load bearing capability, however Mehala was receiving field complaints of rotor spin offs. When parts are assembled with the contact area is still limited to the high ‘peaks’ and ‘valleys’ on the mating surfaces and is typically less than 30 – 40% - due the load on mated parts and micro-movements these peaks and valleys are grinded off and the gaps increases resulting the spin-offs.

Meets High Torque & Temperature Requirements, Saves Assembly Costs

A leading machine tool accessories manufacturer use shrink fit to assembled torque motors for Bio-Directional Tool Turret, but the shrink fit of assemblies involves heating costs and time, additional labor and lower reliability,
customer wanted to improve on these. Loctite 648 Retaining Compound was successfully tested for stall torque test at 120 deg C and savings of more than 28% on heating costs and labor for customers.