RLWP
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Post by RLWP on Mar 21, 2013 13:23:38 GMT
Having spent some time draughting, those templates are great if you want to draw a circle.
If you want to draw a circle of a known size in a known place, they're bloody useless
Richard
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smallbrother
Elder Statesman
Errors aplenty, progress slow, but progress nonetheless!
Posts: 2,269
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Post by smallbrother on Mar 21, 2013 16:17:31 GMT
Having spent some time draughting, those templates are great if you want to draw a circle. If you want to draw a circle of a known size in a known place, they're bloody useless Richard Wow, I need to relive the last 40 years! Pete. |
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RLWP
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Post by RLWP on Mar 21, 2013 16:35:22 GMT
Aha. If you have that much experience, then you will recognise that we all have our own favourite tools to complete jobs. I much prefer the compasses that Taff was looking for. If you get on well with templates, you work that way.
Richard
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taff
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President of City of Newport M.E.S. Chairman, Rivet Counters Fellowship.
Posts: 161
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Post by taff on Mar 23, 2013 17:45:16 GMT
Hello all, Its happend again, I've typed all this before but it all suddenly disappeared. Anyhow the design is progressing now and problems are starting to appear. I've taken on board what has been said about "lifting by the buffers" and having experienced an accident with this some years ago I've strengthened the beams by fitting a 5mm ( or 3/16") plate behind it. I hope this meets with approval as we should be able to keep "scale" at the ends while it will be out of sight from above. I have a problem with the boiler in as much as I have drawn the firebox "scale" length but this brings it within touching distance of the rear hornblocks and axleboxes. My drawing shows my first attempt to provide adequate clearance by putting proper scale radius on the sides of the backhead but I'm not too happy with this. I could move the firebox forward or reduce its length but again not too happy with those approaches. Any constructive suggestions would be welcome. See my attachment which is a bit untidy but I have by no means finalized these parts yet. \I've made a start on the cylinder drawings but only for clearance purposes at present and to try to establish port and passageway sizes. Taff. ![]() [/img] Attachments:
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Post by Deleted on Mar 23, 2013 18:48:04 GMT
Hell Chaps---------- TAFF, from the drawing the answer's simple, ie }--- leave the back or "inner" flange off the axlebox..I don't use them on my locos anyway.. It prevents jamming on rough track...and can't be seen by "Inspector Meticulous" in normal running......no need to shorten a small boiler as well !! Simples..like me !! ;D ;D ;D ;D
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uuu
Elder Statesman
your message here...
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Post by uuu on Mar 23, 2013 22:07:44 GMT
Just two thoughts:
By how much does the boiler expand backwards when hot?
Do you need any extra clearance behind the boiler during assembly, when fitting it into the smokebox?
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jma1009
Elder Statesman
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Post by jma1009 on Mar 23, 2013 22:41:54 GMT
hi wilf,
ive a few locos where the backhead is almost hard up against the horncheeks and rear axleboxes. near enough is enough... 1/16" clearance in a 5"g boiler ive found ok.
as for assembly, usually the smokebox is fitted to the boiler and the whole lot lowered into the frames. ive never attempted to do it any other way other than on LINDA where the cylinders are bolted to the frame that goes almost half way up the smokebox and bolted through the smokebox too. however there is ample room at the rear to slide the boiler in position into the smokebox on LINDA.
peter, as long as you allow a 1/16" clearance i dont see a problem. a deep firebox is far more preferable IMHO to martin evan's dreadful practice of fitting a non prototype lengthened box with a sloping grate. so long as a small fire burns brightly but not forced too hard that clinker forms all should be ok. just careful attention to the free gas flow and superheaters and draughting and valvegear is required to make efficient use of the steam produced by the boiler. im sure don ashton would be pleased to help with the allan valve gear when you get to that stage. it isnt the best of gears and has many foibles that werent apparent to the fullsize designers, but which computer simulators can vastly improve upon.
so far as the buffer beams are concerned i think the 3/16" plate is unnecessary and over the top. i would use 3mm plate and mill the edges where they protrude beyond the valancing. GWR valancing is as deep as the buffer beams at the ends of the valancing. if anyone helps me lift my locos i always tell them not to lift by the buffers but take a firm hold of the buffer beam.
cheers,
julian
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taff
Hi-poster
President of City of Newport M.E.S. Chairman, Rivet Counters Fellowship.
Posts: 161
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Post by taff on Apr 10, 2013 21:38:42 GMT
Hello all,
Its happend again. Typed everything and it suddenly disappeared. If you all were worrying,sno I haven;t disappeared, I've been working busily on the design trying to finalise the mainframe drawing and one of the problems which raised its head was concerning the brake gear. Although the 1361's only had four wheels braked they did have a ruddy great beam across the engine right under the firebox which, of course, would prevent us dropping the ashpan or firegrate. I thought up several solutions and typed them up and was about to post them when Julian, in another thread, suggested the beam be left out and pull rods either side of the ash pan be substituted (see thread re Grate on 3.5" gauge Mogul). This was an arrangement I had also thought up being a typical G.W., style, together with some options, and was about to post it when Julian's words appeared. Another idea is to design the rear brake arrangement to also be part of the ash pan and grate and use it to secure the grate in position. I've by no means finalised this and your further thoughts and suggestions would be welcome.
Taff.
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taff
Hi-poster
President of City of Newport M.E.S. Chairman, Rivet Counters Fellowship.
Posts: 161
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Post by taff on Aug 3, 2013 0:05:47 GMT
Hello all,
A few words to let you all know that I am still very much in to this project but I'm afraid I have also been involved with the full size design for the proposed GWR 4-4-0 County and Dean Single classes which look as though the projects will be going ahead shortly. There are some quite large lumps of metal invol;ved here. I've just drawn the crank shaft for the Dean Single, which had to be drawn half size at 6ins = 1ft and its nearly 4ft long on my drawing board. So you see I am not exactly standing still but the above and an enforced stay in hospital for a few weeks has held me up a bit on the 1361 project. However I am able to report that I have now completed the main frame drawings, cylinders and valve gear and have also prepared a Boiler drawing which, in view of previous comments and advice, I will post in the forum later next week for comment to be made.
Taff/
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Post by doubletop on Aug 5, 2013 6:22:54 GMT
Hello all, Its happend again. Typed everything and it suddenly disappeared. ................. Taff. Taff Can I suggest that when doing large posts you type them up in your favourite text editor and then cut and paste the final into the post window. You'll also have the benefit of a proper English spell checker. If the website stuffs up you've always got the text at hand to do it again Darn sight better than a "Westernised" Simplex !!!  UGH !! Nice, flat sided bunker with no compound curves And yes I'll put my hand up to a Westernised Simplex so wrong on many counts but what else was I going to make it when doing the refurbishment? I'm keen to make amends by doing a GWR 1361, but in 7.25" please. Pete |
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Post by Deleted on Aug 5, 2013 19:31:17 GMT
Hello Chaps----------- sorry DOUBLETOP, my apologies--just me venting my Simplex spleen I'm afraid...........I've lost count just how many times one can see a model locomotive of "unknown" pedigree (and in any gauge as well), that has a splash of Brunswick green on it and the immortal GWR or "Great Western" slapped on as if to give it some credibility etc...Happily the general look of a Simplex does lend itself readily to adaptation--- in this case maybe the look of a pre-grouping Welsh private owner, maybe ??-------- Pete, at least you chose the BEST livery for your Simplex and I salute you, Sir !!--------------OK,....OK, bring on the replies, whilst I duck back behind the parapet !!!
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Post by doubletop on Aug 6, 2013 9:57:19 GMT
Hello Chaps----------- sorry DOUBLETOP, my apologies--just me venting my Simplex spleen I'm afraid...........I've lost count just how many times one can see a model locomotive of "unknown" pedigree (and in any gauge as well), that has a splash of Brunswick green on it and the immortal GWR or "Great Western" slapped on as if to give it some credibility etc...Happily the general look of a Simplex does lend itself readily to adaptation--- in this case maybe the look of a pre-grouping Welsh private owner, maybe ??-------- Pete, at least you chose the BEST livery for your Simplex and I salute you, Sir !!--------------OK,....OK, bring on the replies, whilst I duck back behind the parapet !!! No offence taken. When I got the loco it had been built by a Scottish chap had a blue livery and was call "Thistle", it had to be something different and having gone to school on the Bedwyn line on the final days of steam it was to be GWR. Last time we were in the UK we made a trip to Didcot. I see you are from Telford, I was in the RAF and spent a few years at RAF Cosford. Anyway back to GWR 1361 Pete |
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