Bearing in mind

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Bearing in mind

Post  busman on Mon 21 Nov 2011, 12:31 pm

Have got as far as dry building 1 st wheel and found no bearing in kit , phoned traction world and said modification on some kits on new batch was wondering why change halfway through new batch? confused

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Re: Bearing in mind

Post  Steam Traction World on Tue 22 Nov 2011, 3:46 am

Hi Busman

I guess there are really two questions that need answering here. The first is the one youíve asked directly about why some customers have received wheel bushes with their Kit 1 and others havenít. The second question is why the change?

I want to answer the second question first, but I want to change the emphasis of the answer. That is, we have increased the diameter of the front wheel journal from 22mm to 29mm and as a consequence have dispensed with the bush. We have done this to increase the strength of the axle. Itís quite rare to hear of a front axle breaking, but nevertheless, it has happened. The changes needed to the casting pattern and the increased costs of the castings were minimal. This coupled with the fact that the steel hub and the SGI (spheroidal graphite iron) used for the axle casting represented a good bearing combination, allowed us to see the change as a positive improvement.

We had several previously machined front axles in stock. As the change was seen as marginal rather than imperative we decided to dispatch these first and implement the change with the next batch of axles. We certainly didnít want to see the Ďoldí axles end up in the scrap bin!

Regards

Steve

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Breaking axles!

Post  Steve Traill on Tue 22 Nov 2011, 6:33 am

It must have been one hell of a wheelie to break a front axle! especially with rubber tyres on or was it the first RTA involving a miniature steam engine............................

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