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Post by Deleted on Nov 11, 2014 19:26:11 GMT
I believe it equates to 19 and 38 degrees? Is that degrees off the centreline or the inclusive angle of the whole cone Ed? |
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Post by Deleted on Nov 11, 2014 19:30:44 GMT
Blimey BEN, that'd be some humungus angle if it were half at 38 degrees---- the blast pipe would be half way up the chimney I'd imagine...It's Inclusive ....
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jma1009
Elder Statesman
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Post by jma1009 on Nov 11, 2014 20:24:56 GMT
thank you alan!
im a bit busy next day or so but i have quite a few drawings that show the Greenly formula for draughting which i will endeavour to put on here. the main problem comes in applying the formula to large diameter short chimney locos in miniature (and in fact the almost identical Goss formula created the same problems in fullsize).
cheers,
julian
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Post by ejparrott on Nov 11, 2014 23:43:14 GMT
I believe it equates to 19 and 38 degrees? Is that degrees off the centreline or the inclusive angle of the whole cone Ed? Inclusive, not off the CL |
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jma1009
Elder Statesman
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Post by jma1009 on Nov 18, 2014 20:46:32 GMT
i havent managed much time in the workshop recently due to family bereavement, but here's the ends of the superheater elements silver soldered to phos bronze 'T' piece for the steam pipe connection. ive also silver soldered the nipple on the end of the snifting valve pipe and made the sifting valve which can be seen to the right of the steampipe. the snifting valve is a push fit into the bottom of the smokebox and saddle. the 3/16" dia rod sticking out of the blast pipe is to check concentricity of the petticoat pipe and chimney. cheers, julian  |
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steam4ian
Elder Statesman
One good turn deserves another
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Post by steam4ian on Nov 18, 2014 22:14:13 GMT
That's neat Julian.
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jma1009
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Post by jma1009 on Nov 18, 2014 23:50:18 GMT
hi ian,
that's very kind of you.
quite a bit of thought went into the smokebox innards to give the best arrangement to allow cleaning of the tubes plus easy access for the connections plus (incidentally) more build up of steam in the steam pipes because the steam chest has quite a low volume. the single steam pipe to the steam standpipe into the cylinders is only 1/4" dia on the martin evans drawings and the stand pipe only 3/8" dia x 32 tpi. i increased the steam standpipe to 7/16" x 26 tpi with a larger hole through it, and jim scott did the same and jim has increased the single pipe to the standpipe to 5/16" dia. this should give both our locos a bit of extra 'oomph'!
cheers,
julian
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Post by Roger on Nov 19, 2014 0:10:58 GMT
Lovely work Julian, and that's going to be very practical. I take note and learn for that example.
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Post by Deleted on Nov 21, 2014 17:51:20 GMT
More Hoo-haaing from 55, the difference in regulator setting making an impact in the clarity of the note when opened up in the run round sequence and at the end in the dark 672 doing all the work, much softer hoo haa noise from her. Oh and some weird blue thing and Baxter before that!!  m.youtube.com/watch?v=-LRjmWwLdAM |
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jma1009
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Post by jma1009 on Nov 23, 2014 18:51:34 GMT
my job for this weekend in the workshop was to have 'a go' at the check valves. these have been made out of hard drawn phos bronze and i havent followed the martin evans drawings. anyway pic 1 is one of the check valves before silver soldering together and hopefully you can see how the 2 parts fit together. pic 2 is after silver soldering, with a mark 1 'fake' flanged joint as a union for the cone for the 5/32" dia thinwall pipe from one of the 2 injectors. as ben and george will know ive made a mistake with the mark 1 style bolted flanges as in fullsize there is no gap between the flanges... so mark 2 underway! cheers, julian   |
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Post by Roger on Nov 23, 2014 19:15:59 GMT
Super neat and beautifully executed as usual Julian. That's really elegant and pleasing.
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jma1009
Elder Statesman
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Post by jma1009 on Nov 30, 2014 9:59:19 GMT
ive had a go at the whistle valve for Stepney. the turret is machined out of the Boxhill crosshead pump gunmetal casting. im not entirely happy with either as both are a bit too big and chunky for my liking though the passageways in the whistle valve are quite generous. anyway i now know it can be assembled without fouling anything else! a few pics cheers, julian   |
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Post by Roger on Nov 30, 2014 12:20:34 GMT
Looks good Julian.... why the three outlets?
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Post by Deleted on Nov 30, 2014 14:41:15 GMT
looking very busy in there Julian....I like busy... first class work as per usual... Pete |
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uuu
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your message here...
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Post by uuu on Nov 30, 2014 14:56:26 GMT
Looks good Julian.... why the three outlets? You can never have too many. Pressure gauge, two injectors (I'm guessing those) - but blower, hydrostatic lubricators, vacuum ejector.... Wilf |
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Post by ejparrott on Nov 30, 2014 16:17:51 GMT
Injector valves are out in front of the cab are they not? I'm guessing pressure gauge, vacuum brake? Blower's on the hollow stay...I'm stumped, go on then Julian?!
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Post by Deleted on Nov 30, 2014 17:05:52 GMT
Yes indeed, very nice work.
Cheers
Tom
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jma1009
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Post by jma1009 on Nov 30, 2014 20:43:13 GMT
thanks guys!
the pressure gauge comes off the side of the right hand water gauge elbow
the 2 injector steam valves are on the barrel behind the dome.
steam brake valve supply comes off the bottom of the blower valve (to the right of the right hand water gauge).
at the moment the hydrostatic lubricator steam feed will be the valve to the left of the left hand water gauge (where in fullsize the steam sanding valve went).
blower steam feed comes off the turret, as does the steam feed for the vacuum ejector. there is a spare connection on the turret in case i fit working sanders.
cheers,
julian
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jma1009
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Post by jma1009 on Nov 30, 2014 21:24:22 GMT
(in fullsize the original terriers had the pressure gauge connection on the top right hand water gauge fitting. in case my club boiler inspector doesnt like this the spare on the turret can be used) i am far from happy with the whistle valve and turret. i will have a go at a Mark 2 version which hopefully will be smaller. however the internals of the whistle valve wont get altered. there is a limit to how small you can make a whistle valve yet still supply sufficient steam to operate a decent sounding and loud whistle! i might also have a go at a push button type whistle 'handle' that the later terriers and Stepney and Fenchurch have fitted in fullsize. here's a pic of the push button type fitted to terrier Newport  cheers, julian |
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Post by Roger on Nov 30, 2014 22:00:15 GMT
Can you turn down the outside of what you already have rather than making something afresh?
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