FASTENERS & SEALING May the force of the


SPRING T


he engineers at Jedi Racing Cars in Wellingborough had a recurring problem when servicing their F1000 single seater racing cars: the half


shaft CV pot joint they were using, derived from the original Mini, just wasn’t intended for quick removal and often resulted in breakage of the adjacent casting mounted  Mike West of Lee Spring explains,


“It was John Corbyn, MD at Jedi, who came up with the idea of using a spring to make it easier to get apart and cut the  Mini mechanics inside out so called our customer service team and they asked me 


CONICAL CONCEPT “I went to see him and saw the problem  separate the joint without having to fully dismantle the drive shaft, by using a compression spring to apply a force between the two surfaces without being  looked at the dimensions they had about  I knew that putting a standard 25mm compression spring in situ wouldn’t work


38 www.engineerlive.com


and would allow too much movement,  conical spring would do the job, with a dimension of 55mm at the base and 20mm at the top and an overall height   from using a standard compression spring   on the spec of this we determined what  


  removes the need for a retaining circlip, which sometimes necessitated destroying   at Lee Spring quickly turned around a set


ABOVE: Jedi differential with two CVs, each equipped with Lee Spring conical compression spring


TOP: Jedi F1000s in action with innovative Lee Spring components


be with you


How new springs are saving service time and components at a race car manufacturer


of sample springs for test and we have had no problems with the assembly in two seasons since – it has transformed the  


(formerly Formula Jedi) has provided       handling characteristics and powered by   seconds and on to 150mph, while revving 


SPEEDING UP SERVICE TIMES “It is ideal for the novice or serious club     great importance to keep budgets down    


For more information visit www.leespring.co.uk


IMAGE COURTESY OF SHAUN SMITH MEDI


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