jma1009
Elder Statesman
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Post by jma1009 on Sept 21, 2014 21:53:31 GMT
hi jim,
that is very kind of you. i dont expect everyone to agree with my methods, but i learnt the hard way having had to repair 2 club locos before i finished my first loco. i suppose everyone is conditioned by their own individual experiences! when you've had to completely dismantle a loco and take all the cleading and lagging off because someone has screwed the boiler to the smokebox just to do some minor repair (with same screws shearing off in the process and having to be drilled out) i vowed never to fix a loco together that way!
cheers,
julian
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Post by Jim on Sept 22, 2014 4:14:16 GMT
Hi Julian,
Re smoke box to boiler connections I couldn't agree more, As you say 'you learn the hard way.'or if you belong to a site like this, from the experiences of others such as yourself who are generous enough to share their own experiences.
Jim
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shooter
Part of the e-furniture
If it 'aint broke....don't fix it!
Posts: 252
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Post by shooter on Sept 22, 2014 7:41:11 GMT
Well said Jim. Thought I was a model engineer until I joined this forum. Then realised how little I knew!!
Steve
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Post by Deleted on Sept 22, 2014 20:47:40 GMT
Hello all,
Im new and just started a electrical and mechanical engineering course in college. Some help advice and guidance would be much apprecatied.
Thank you in advance
Emma x x :-)
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jma1009
Elder Statesman
Posts: 5,922
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Post by jma1009 on Sept 22, 2014 22:07:18 GMT
im getting on to a bit of fun work at the moment - ive started on the chimney! ive never made a chimney from a casting - damned awkward on my basic equipment though my topslide does have a travel of about 2.5" anyway here's a start on the chimney base with the side profile nearly finished, and a 7/8" dia hole bored through the lump of brass. tons of swarf/brass chippings everywhere! the sides of the chimney base will be done with a file, as will the curve to match the top of the smokebox wrapper. ive had a go at making the chimney barrel out of some 1" dia copper pipe, drifting it with a specially made taper insert to get the thing formed to the correct taper. the BOXHILL chimney drawing is actually quite good, but i have the advantage of at least 4 drawings of Stroudley chimneys. i think most people would say the Stroudley chimney is one of the most elegant and perfect chimneys ever to grace steam locomotives. cheers, julian  |
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Post by Roger on Sept 22, 2014 22:15:26 GMT
That's a good start Julian, it's surprising what you can do with a manual machine. I've finally managed to create the 3D model for SPEEDY's chimney and I think I could have done it the hard way in the amount of time it's taken to figure out how on earth to create the compound curves! It's not always a doddle with all the modern tech.
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jma1009
Elder Statesman
Posts: 5,922
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Post by jma1009 on Sept 22, 2014 22:28:48 GMT
thanks roger!
it took longer to hoover up the workshop and house carpets of brass chippings than it did to bore the above and turn the above profile!
jim scott has already made his beautiful Stroudley chimney for his 5"g terrier and had very kindly sent me a lump of copper to turn the copper cap out of, which i am looking forward to attempting.
cheers,
julian
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Geoff
Hi-poster
Posts: 171 
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Post by Geoff on Sept 22, 2014 23:53:45 GMT
It was a huge challenge for me to work out how to hold my chimney casting in my old Granville lathe, but did eventually get there and really enjoyed doing that piece of work. I'm still trying to decide whether I should paint the whole thing or leave the top as a far from authentic bit of bling.
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jma1009
Elder Statesman
Posts: 5,922
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Post by jma1009 on Sept 23, 2014 0:00:26 GMT
hi geoff,
if its an SR L1 semi matt or matt black all over smokebox and chimney! (never gloss black on the SR for chimneys and smokeboxes).
i wouldnt describe a chimney top polished whereas in fullsize it was cast iron and painted as 'bling' but i can think of a few other words to describe such an abomination and departure from the fullsize locos!
cheers,
julian
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jma1009
Elder Statesman
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Post by jma1009 on Sept 23, 2014 0:11:43 GMT
here's my drawing for the chimney. the way the parts fit together will get altered but the outside dimensions are as 'scale' as i can get them. cheers, julian  |
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Post by Roger on Sept 23, 2014 6:30:00 GMT
That's very tall and slender, I can see why people think they're elegant.
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Post by GWR 101 on Sept 23, 2014 6:50:12 GMT
Julian nice bit of freehand turning, did you make a template to machine to ?. Excuse my ignorance on this, am I correct in assuming the 3/4" bore x 7/8" OD at the bottom is the petticoat pipe. Is this a "tight" push fit into the bottom of the chimney, and have you decided how the chimney will be secured to the smoke box. Apologies for so many questions, I ask because I am nearly at this stage with my build. Thanks in advance Paul
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jma1009
Elder Statesman
Posts: 5,922
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Post by jma1009 on Sept 23, 2014 11:39:56 GMT
hi paul,
you are absolutely correct re the 7/8" bore in the base being for the petticoat pipe material. an easy push fit when finished. if the chimney has a polished cap which this one does i prefer not to secure the chimney to the smokebox so the chimney can be removed to do the necessary with the brasso. if the petticoat pipe is secured to the smokebox wrapper by screws hidden under the chimney base the petticoat pipe and fit of chimney base to smokebox wrapper holds everything in line quite firmly.
cheers,
julian
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Post by GWR 101 on Sept 23, 2014 17:04:58 GMT
Julian, many thanks for that insight, that's definitely the way I will go. It's amazing no matter how long one has been in engineering there are still things to learn, I have just spent most of the day milling some track to make a pair of point blades for a set of 7 1/4" points, that's something else I knew absolutely nothing about. Regards Paul
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Post by gingerneer on Sept 24, 2014 9:40:34 GMT
Julian
This thread is a great source of information. Looking forward to seeing the finished loco.
Will
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jma1009
Elder Statesman
Posts: 5,922
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Post by jma1009 on Sept 24, 2014 22:37:35 GMT
more fun work this evening!! ive nearly finished the Stroudley copper cap out of solid copper. im not quite happy yet with the profile - and will require a bit more tittivation. all my GWR copper capped chimney caps have been turned from hard drawn phos bronze (same coppery colour) - which is tricky stuff to machine, but nothing like as tricky as copper as for STEPNEY! the beading at the bottom of the copper cap is oversize at the moment. cheers, julian   |
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Post by Deleted on Sept 24, 2014 23:48:33 GMT
I do like that....I love seeing a bit of bling on a locomotive, so much so that perhaps one day I may build something suitable from the nineteenth century...not sure on region though...something a little simpler than my current project..it would have to be, I won't live forever...  great work Julian Pete |
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jma1009
Elder Statesman
Posts: 5,922
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Post by jma1009 on Sept 24, 2014 23:52:47 GMT
thanks pete!
as per K J Cook and the LNER V2 i dont think a loco is a proper loco unless it has a copper cap to the chimney!
cheers,
julian
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Post by Deleted on Sept 25, 2014 2:40:20 GMT
Julian, that chimney cap is a beautiful thing! Nicely done!
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Post by Roger on Sept 25, 2014 7:42:05 GMT
Great job Julian. I know that you mean about copper, it's a ghastly material to machine. I think it might be easier with neat cutting oil but I haven't tried it yet. I know it wants to tear and weld itself to the tool given half a chance.
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