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captive spindle valves

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Speedy Builder5	09/07/2011 16:52:35
2878 forum posts 248 photos	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' ???
JasonB	09/07/2011 17:45:02
25215 forum posts 3105 photos 1 articles	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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