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Member postings for Chris Randall

Here is a list of all the postings Chris Randall has made in our forums. Click on a thread name to jump to the thread.

Thread: Miniature Duplex Gauge
09/02/2012 18:13:46
Many thanks to Yanna Dickens for providing a scan of the article.
 
Chris
 
 
04/02/2012 11:28:58
Hello Laurence
 
Thanks for your response and the information. I'll have a look at both those sources.
 
Regards
 
Chris
04/02/2012 08:54:31
Hi All.
 
Some years ago I built a 1 inch diameter duplex vacuum gauge. It was an interesting experiment and was a continuing project until the gauge was lost (or stolen?).
 
I'd like to have another go at making one before my eyesight gets any worse!
 
Does any reader have any helpful information about the construction of such a gauge or any drawings?
 
Thanks for looking..
 
Regards
 
Chris
Thread: Brake Cylinder Dimensions
03/02/2012 07:32:41
Hello Mike
 
Thanks for your helpful post.
 
Scaling down your suggested dimensions for 7.25 inch gauge I see that max size would be about 1.125 inches based on full size practise. I think mine is 1.5 inches. The ratio of all the linkages must be about 4 times increase in pressure.
 
It will be interesteg to see what happens when loco is fully assembled and running and I might have to sleeve the cylinder and make a new piston or else end up with square wheels!
02/02/2012 03:17:48
I am fitting a steam brake to the loco but I have overdone the size of the brake cylinder! Can anyone devise a formula for the cylinder diameter? I am not sure of the axle load and calculated it from a guess, making the pressure on the brake blocks equal to the weight carried by the driving wheels.
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