Tuesday 11th June 2013

Magic Carpet fix

A recent shaft coupling connection challenge was successfully solved by the Heli-Cal flexible beam product available through Abssac Limited.

Abssac’s customer had an application where a precision encoder was being connected to a carpet manufacturing machine output shaft.  The machines are used to manufacture man-made fibre twisted loop pile carpets for domestic use. If the vibration and movement present at the output shaft was transmitted to the encoder, it would cause signal errors and ultimately destroy the encoder. Whilst very little torque was required in the application, torsional stiffness and zero backlash were important design parameters. The customer also wanted a low maintenance solution.

From a coupling design aspect, the application required large axial motion and parallel misalignment because of the assembly tolerances of the crankshaft. The customer was originally using a multi-part bellows shaft coupling, but the required angular and axial movements lead to premature failure. Additionally, under certain operating conditions, the bellows coupling allowed too much vibration to reach the encoder.

The solution was found using an adapted Heli-Cal flexible beam shaft coupling. A part was created using two flexible beam elements in the single piece design. Each flexible element allowed for the maximum angular and axial offsets set by the customer.  A "no charge" sample was then sent for test and evaluation. Testing proved very successful and verified the new Helical coupling design provided better isolation of the encoder from the motor and better performance. Subsequent machines will now be fitted with this drive solution.

If you have a shaft coupling parameter that is outside of the normal standard shaft coupling capability Abssac may have the solution you require.

ABSSAC LIMITED, E1A Enterprise Centre, Enterprise Way, Vale Park, Evesham, Worcestershire, WR11 1GS
T : 01386 421005 F : 01386 422441 W: www.abssac.co.uk  E : simoncattle@abssac.co.uk