captive spindle valves

[Speedy Builder5Participant @speedybuilder5]

Is it just me, but following the discussions in ME relating to boiler inspection and captive spindle valves, I dont remember seeing any designs (or very few) showing approved valves. All of M.Evans, LBSC and lately Ray McMahon show non captive spindles. Apologies in advance if I am wrong.

 

Can anyone point me to some suitable approved designs for a typical 5″ loco.

 

Also whilst on my hobby horse, why do we have drawings that were drawn in fractions of an inch re-printed in decimal inches. I thought CAD was so good that it could still use fractions. For example Peter Rich 5″ GWR shows on the plan 0.312″ for 5/16, 0.281 for 9/32 and a classic 1/4 x 1/4 x 0.062 angle etc, etc I can just about measure 9/32 on a steel rule, but never 0.281″ (Sorry Peter as I can guess how much hard work and dedication for the enjoyment of others goes into writing an article) I guess that we all have CNC mills and lathes now with DROs. Has a survey ever been taken as to how many readers still rely on rulers, or will we see yet another division of the Model Engineer into ”N/c ME and ‘Fractional ME’ ???

[Speedy Builder5Participant @speedybuilder5]

Looking for valve designs

[JasonBModerator @jasonb]

I don’t mind how its written so long as its right

 

Could be worse, we have a mix of fractions and decimals on the Rina hopper, but you can still make it from whats there which is what really counts. Must say the hopper and a bit of filler to form a few fillets do make this look a nice engine.

 

J

Edited By JasonB on 09/07/2011 17:45:38

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