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Valve gear design

Super Claud

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John Neugebauer17/04/2018 12:48:30
1 forum posts

Hi John,

This is totally unrelated to the Super Claud valve gear as I am currently scratching my head on Joy's outside valve gear settings for an L&B engine, but I have a complete set of 5"G un-machined cast iron wheel drivers and bogie wheels for the Claud loco at reduced cost - interested?

regards,

John N

David Taylor18/04/2018 00:21:50
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144 forum posts
39 photos

Posted by julian atkins on 10/11/2017 19:06:01:

Note with slide valves (outside admission) loco links are preferred with direct drive, and launch type links with indirect drive. In each case there will be a small suspension offset and a small amount of die block slip so the eccentric throw need only be a tad more than calculated.

If you have loco links with indirect drive, or launch type links with direct drive (for outside admission/slide valve) the suspension offset will be considerable to achieve equality of valve events and there will be considerable die block slip which also requires a greater eccentric throw and larger expansion link to compensate/accomodate the excessive die block slip.

That is very interesting. My naive thought was that launch links with direct drive would have given the largest range of adjustment and best running.

Now I don't feel so bad my loco has loco links with direct drive

John Billard 119/04/2018 13:14:04
111 forum posts

Dear John

Many thanks for the offer of the Claud castings.

I am departing from the Martin Evans design quite a bit in that the driving wheel he specifies is too small by about half an inch. I presume that yours is the same? There being nothing else suitable I have made a pattern ready for casting. Equally the bogie wheels, I have investigated the Blackgates version but find that the tyre width where it joins the spokes is too thick and there's no way round that. Fortunately I have a pattern I made for another project available that will do.

But thank you for the kindness.

With best wishes

John

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