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Post by rogsteam1959 on Nov 11, 2014 23:03:09 GMT
Hello,
Where can I get drawing of the valve gear?
I want to replace the die blocks but don't know the radius for it.
Thank you.
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Post by Deleted on Nov 12, 2014 13:24:17 GMT
I'm pretty sure that the 14XX was based on Neville Evans's Didcot. If so, the centre of the slot in the expansion link is 4.25" radius and the slot is 0.25" wide.
John
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Post by gwr14xx on Nov 12, 2014 14:12:59 GMT
Surely, the radius to the centre line of the slot should be equal to the distance between the centres of the eccentric strap and link assembly!
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Post by rogsteam1959 on Nov 12, 2014 22:39:14 GMT
Thank you,
Now i have to find out how to remove the pin for the die block.
Either it is glued, or with a thread.or both;-)
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Post by Deleted on Nov 13, 2014 0:06:39 GMT
Surely, the radius to the centre line of the slot should be equal to the distance between the centres of the eccentric strap and link assembly! It is. On Didcot this is 4.25".  John |
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Post by ejparrott on Nov 20, 2014 12:21:58 GMT
Surely, the radius to the centre line of the slot should be equal to the distance between the centres of the eccentric strap and link assembly! Not strictly true |
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jma1009
Elder Statesman
Posts: 5,900
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Post by jma1009 on Nov 23, 2014 18:59:02 GMT
to clarify Ed's post, for equality of leads you need to use the formula published by don ashton which requires a very small addition to the eccentric rod length. for the formula you need to work out the correct angle of advance that suits the valve gear. the addition is likely to be something like an extra 10 thou approx.
cheers,
julian
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Post by Deleted on Nov 24, 2014 13:44:53 GMT
That's true but I didn't want to complicate things  Neville and certainly the Winson 14XX wouldn't have used Don's calculations. John |
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Post by esperanza on Jan 26, 2022 1:50:41 GMT
Hi John ,
Do you have the drawings for Didcot or 14XX please?I have a built chassis and no drawings or instructions Can you oblige?/
Cheers
Dave Roberts
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Post by GeorgeRay on Jan 26, 2022 8:40:02 GMT
In case you haven’t realised John is no longer a member of this forum and hasn’t posted for several years.
George Ray
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Neville and certainly the Winson 14XX wouldn't have used Don's calculations.
