|
|
Post by terry1956 on Aug 26, 2014 16:05:05 GMT
Hi chaps, after looking at some drawings I sm going to make the valves needed.one thing I am not sure of is how to get a nice cone shape seating.also I would like to use a on off type valve for the injector valve.as anyone got a drawing of one of these valves for a 5 inch gauge loco they could send me.thanks.michael
|
|
jma1009
Elder Statesman
Posts: 5,901
|
Post by jma1009 on Aug 26, 2014 21:53:39 GMT
hi michael,
re the coned ends of steam valve spindles (which is i assume what you mean rather than "cone shaped seating") my method is to thread the correct length of the spindles using a tailstock dieholder, then make up an adapter out of brass hex in the 3 - jaw, centre drill, drill tapping size then tap for thread to match the spindles. note orientation of adapter and which chuck jaws went where. the adapter needs drilling through and tapping full depth, and the depth of the adapter is the length of the required thread on the spindle. i make the squares on the end of the spindle for the handle then screw into the adapter from one end or the other depending on whether the valve spindle is captive. replace adapter in 3 - jaw with correct orientation, and turn the cone on the end. as im very lazy and dont like changing lathe tools i usually turn a cone freehand twiddling both handles, then finish off to a nice smooth finish with a clockmakers gravel. for those not used to using a clockmakers gravel a dead smooth file with handle fitted will do instead. you cant usually set the top slide over to machine the coned end without a great deal of faffing about and waste of time. you could feed a wide parting type tool in at the required angle as an alternative method.
the finished spindle is then easily unscrewed from the adapter using the square on the end.
the above method ensures concentricity of thread with coned end.
cheers,
julian
|
|
|
|
Post by arch1947 on Aug 26, 2014 22:06:57 GMT
G'Day Micheal, I use the same method as Julian for turning the taper on the valve spindle but I put the compound rest over to the desired angle and, with a sharp tool and relatively high spindle speed, turn the taper. Can't help with the on/off valve. My understanding and I am by no means an expert, is that some adjustablility of steam flow is desirable for injectors in which case on/off would not be the best.
Cheers,
Arch
|
|
jma1009
Elder Statesman
Posts: 5,901
|
Post by jma1009 on Aug 26, 2014 22:21:27 GMT
hi Arch,
i think michael's query re on/off valves would be for a quarter turn water valve for the injectors. all of martin evans' designs from the 1970s onwards have these type of valves. you can make them externally a lot more compact and smaller than the rather chunky standard martin evans' design.
cheers,
julian
|
|
|
|
Post by terry1956 on Aug 27, 2014 5:48:31 GMT
thanks to you both, and yes I do mean the 1/4 turn water valve. One more question. this is about the blower tube that is screwed into the blower valve. excess for this is a real pain, and I just don't see how I can fit the valve back onto this screwed blower tube. would it be ok to make the blower valve with an outlet that allows me to run the blower tube outside the boiler run along side it and then back into the smokebox. what are your views . michael
|
|
|
|
Post by Deleted on Aug 28, 2014 15:23:34 GMT
------------for the water valve you might want to consider the type that compresses a rubber tube through which the water flows through....Guaranteed no air leaks !!
|
|
|
|
Post by terry1956 on Aug 28, 2014 19:21:50 GMT
Hagley, re the rubber tube.what type of rubber would be best for that, and how do I get some.michael
|
|
|
|
Post by Deleted on Aug 28, 2014 21:39:40 GMT
Hagley, re the rubber tube.what type of rubber would be best for that, and how do I get some.michael -------------AH-ha !!---- Hoisted by my own petard it would seem..I have to confess I've never made any as such myself but have seen them on occasion ( albeit a rare one it has to be said !!)..........So let's throw that one open to all-comers whist I discreetly fall on my sword !!------------ Anyone out there any contributions for this type of valve ??-----------  |
|
|
|
Post by Doug on Aug 29, 2014 7:28:21 GMT
Hagley, re the rubber tube.what type of rubber would be best for that, and how do I get some.michael -------------AH-ha !!---- Hoisted by my own petard it would seem..I have to confess I've never made any as such myself but have seen them on occasion ( albeit a rare one it has to be said !!)..........So let's throw that one open to all-comers whist I discreetly fall on my sword !!------------ Anyone out there any contributions for this type of valve ??----------- thats just silly that sword is way too long the harikari sword is the middle one of the set  |
|
|
|
Post by ejparrott on Sept 2, 2014 20:04:47 GMT
would it be ok to make the blower valve with an outlet that allows me to run the blower tube outside the boiler run along side it and then back into the smokebox. what are your views . michael Every engine I know in full size is built this way. |
|
|
|
Post by Deleted on Sept 2, 2014 21:51:10 GMT
C class, H class, O1 class, U class, N class, more than likely U1, N1 and most other late Chatham designed engines have internal blower pipes  Ben |
|
|
|
Post by Deleted on Sept 3, 2014 8:29:00 GMT
Just a thought but in model boiler terms would that set-up constitute having an external pipe at boiler ( or near) pressure ??-----------Probably not, but----  ?? |
|
|
|
Post by Deleted on Sept 3, 2014 8:38:14 GMT
No different to having a steam pipe to an injector or a whistle. The only problem with external blower pipes is that the steam is a bit wet when you first turn them on due to condensation.
John
|
|
|
|
Post by terry1956 on Sept 3, 2014 9:50:14 GMT
Thanks chaps, but I just dont get the pics of the chap with sword. The Kanta was not used to cut the stomach but for his friend to cut off the head after the first cut of the man committing suicide. Anyway still have no idea why the pics.
|
|
|
|
Post by Doug on Sept 3, 2014 11:45:54 GMT
Thanks chaps, but I just dont get the pics of the chap with sword. The Kanta was not used to cut the stomach but for his friend to cut off the head after the first cut of the man committing suicide. Anyway still have no idea why the pics. just go with it lol |
|
|
|
Post by Deleted on Sept 3, 2014 14:34:48 GMT
-------------AH-ha !!---- Hoisted by my own petard it would seem..I have to confess I've never made any as such myself but have seen them on occasion ( albeit a rare one it has to be said !!)..........So let's throw that one open to all-comers whist I discreetly fall on my sword !!------------ Anyone out there any contributions for this type of valve ??----------- thats just silly that sword is way too long the harikari sword is the middle one of the set ----------it's me "falling on my sword".... only it's not me at all but the late Martin Evans after hearing what people thought of his then current "SWINDON" 5" Ex-GWR 2-8-0 model !!!.............. |
|
??