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Author Topic: Aprilia gear material  (Read 1268 times)
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davidwheeler
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« on: 03 April, 2011, 09:29:40 AM »

My fabled new bottom gear wore out in a few hundred miles die to being made of the wrong kind of steel.  Does anyone now where I might find the correct specification?
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David Wheeler.  Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
phil-m
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« Reply #1 on: 03 April, 2011, 08:14:13 PM »

You could do worse than use G.K.H.W by Aubert and Duval. It will not be cheap but it is one of the best steels you can get.
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davidwheeler
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« Reply #2 on: 06 April, 2011, 11:15:04 AM »

A search of the Albert and Duval web site fails to find G.K.H.W.  What manner of steel is it?  The nearest I can find is GKH, a steel for nitriding with C Cr Mo.  It seems to have the highest ultimate tensile strength and yield strength.
David
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David Wheeler.  Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
DavidLaver
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« Reply #3 on: 06 April, 2011, 11:26:40 AM »


Picking the thread up at this point why did you not get the gear made by a gear maker?  They'd have stocks of the correct steels and be heat treating (and whatever) else appropriately day in day out.

David
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David Laver, Lewisham.
the.cern
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« Reply #4 on: 06 April, 2011, 04:32:08 PM »

I'm a Civil Engineer, not a Mechanical Engineer, but I do think hardness rather than tensile strength may well be the criterion to check for here. David's suggestion to go to a gear specialist would seem to be a good start. You might get only  advice if they don't do 'one offs' but at least you'll have started the process. As a matter of interest, where did the specification for the material for the failed set come from.

Good luck with it and if you come across a good gear cutting specialist, please let us all know, the  people I used sold up in the eighties !!!!!

                       Andy
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Dilambdaman
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« Reply #5 on: 06 April, 2011, 05:30:04 PM »

Neve Engineering - specialist gear cutting.

Not used them but heard good things about them.

http://www.neveengineering.co.uk/site/index.php

Robin.
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Robin Lacey 3222

1932 Dilambda
1969 Fulvia S1 1.6HF Fanalone
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