A 16tonne rotary table press, made by P J Hare, has an 800mm diameter steel dial plate and is being used to assemble high quality bearing cages. The index time on this machine is between 0.5s and 0.75s with cycle on demand. The bearing cages must be accurately positioned for even, consistent pressure to be applied round the perimeter of the bearing cage.
The press uses a Manifold Industries manufactured Mk2 Slimdex SX60 four-stop globoidal indexer mated to a gearbox and a four-pole, 0.37kW rated brake-motor with an overload clutch.
A rotary table press differs from standard general purpose presses in that the multiple stations on the rotary table permits loading and unloading to take place while the ram cycles.
Mk2 Slimdex series of indexers are low profile units featuring Globoidal cam controlled movement for speed, precision and reliability, with the ability to accommodate very heavy tools and components without any risk of overshooting.
Principally, indexers comprise two main parts. The cam is a `wormdrive’ like component which is secured firmly onto a shaft with a keyway. The shaft is then driven by a motor through a right-angle gearbox.
The second major component is the turret, the flat circular plate-like component onto which the turntable is mounted. As the motor shaft turns, cam rotation angularly displaces the turret by one station. The shape of the cam profile is critical as it determines the acceleration and deceleration of the turret and thus the turntable.