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Post by Jo on Mar 10, 2020 7:49:40 GMT
I fear all this thread stuff has gone down a rabbit hole All I would add is please try not to mix threads on a model: If you use metric threads, use all metric threads. If you use BA threads, use all BA threads (except for steam fittings which use the specialist ME threads). Jo
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uuu
Elder Statesman
your message here...
Posts: 2,816
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Post by uuu on Mar 10, 2020 8:33:34 GMT
I'm afraid we're all living in the past if the prototypes we're trying to model are steam powered.
Wilf
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Post by Shawki Shlemon on Mar 10, 2020 8:55:02 GMT
It is hobby and not serious work for living . I support each to his/her own , old/ new methods , fractions /metric whatever . I was trained in both metric and imperial , actually more metric but when I started work life in aircraft industry , all was imperial both British and American so I have no problems with fractions /threads and so on . I prefer to build my models in imperial but I respect those who choose metric . It is not an issue . As for ;equipment again whatever one can afford and is comfortable with .
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Post by mr swarf on Mar 10, 2020 9:49:57 GMT
I may be guilty of living in the past. Some of my tools are older than me! P3102088 by Mr Swarf, on Flickr Paul
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Post by simplyloco on Mar 10, 2020 9:56:54 GMT
I may be guilty of living in the past. Some of my tools are older than me! SNIP Paul Paul I was 16, and one year into my Army Apprenticeship when that gadget was made! I think I recognise the military part number...! John
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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 10, 2020 10:12:40 GMT
I first visited a ME club in about 1964 when I was 9. I thought the people running it were a lot of strange old men.
Nothing has changed.
Pete.
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Post by silverfox on Mar 10, 2020 11:51:07 GMT
Peter
And now we is them!!
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jasonb
Elder Statesman
Posts: 1,209
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Post by jasonb on Mar 10, 2020 13:38:51 GMT
All I would add is please try not to mix threads on a model: If you use metric threads, use all metric threads. If you use BA threads, use all BA threads (except for steam fittings which use the specialist ME threads). Jo If only it were that simple, let's take a recently built model. It was an American design so the UNC was changed to metric for fixings and most threaded parts. Had a sparkplug so as I mentioned earlier had to go with 1/4" x 32 UNEF. And before anyone says make your own spark plugs I actually did but wanted to keep the option of commercial plugs incase mine did not work. Wanted to be able to use available pipe fittings for exhaust so converted NPT to G (BSP under the euro name) I did opt for Mod 1 gears buying the 12T spur but cut mu own internal 24T with a home made cutter, luckilty the gears were not part of the original engines design otherwise I would have had to do a lot of alterations to make MOD fit the PCD of DP gears. Why not metric steam fittings Jo, easy enough to buy metric unless you only want to source from the UK or make your own. I made just about all the fittings for my Minnie and Fowler so could just have easily gone metric but at the time I did not know better. Also wonder how many builders will want to design and pay for having a metric boiler approved rather than just keep knocking out the old imperial ones
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Post by andyhigham on Mar 10, 2020 14:21:14 GMT
In 1971 the UK currency went decimal, I was at school (12 years old) and was taught in the metric system as the imperial system was being phased out, the motor industry was slowly phasing out UNF and UNC threads in favour of metric. Up to 1971 BSA had used BSW and cycle threads for all fasteners. In 1971 they switched over to.................UNF and UNC
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jem
Elder Statesman
Posts: 1,067
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Post by jem on Mar 10, 2020 18:25:56 GMT
The real problem is the similarity between many threads. You think the fitting is BSP 1/8 inch so you make a fitting for it, but then you find that it was actually 10mm by 10, very very close, but not good enough!!! And this applies to very many threads!
Jem
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Post by chester on Mar 10, 2020 18:27:20 GMT
Be fair Andy that was to suit the American market where they sold the most machines.
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Post by Roger on Mar 10, 2020 19:41:50 GMT
Be fair Andy that was to suit the American market where they sold the most machines. Now there's the reverse happening, in that the USA are progressively having to produce Metric products if they want to export to the rest of the World. As a result, they have the choice of producing two nearly identical products, one for the home market and one for Export, or stop swimming against the tide and adopt the Metric system which they committed to do back in the 70's
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Post by andyhigham on Mar 10, 2020 19:58:05 GMT
It must stick in the craw of Americans that every one of their "all American" Chevvies, Cryslers, Fords etc have either 10mm, 14mm or 18mm spark plugs
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Post by racinjason on Mar 10, 2020 21:32:31 GMT
I one owned an 1989 Camaro and everything was metric except for the core engine bolts the injection and bolt on engine parts were also metric and that was from factory. So they have been mixing it up for a while, but the 1982 Camaro I owned was all imperial. Cheers jason.
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Post by manofkent on Mar 10, 2020 21:43:11 GMT
I have a friend who works in the aerospace industry. He tells me that most of his work these days is in imperial measures to co- ordinate with the Americans. John
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Post by keith1500 on Mar 10, 2020 21:47:31 GMT
I one owned an 1989 Camaro and everything was metric except for the core engine bolts the injection and bolt on engine parts were also metric and that was from factory. So they have been mixing it up for a while, but the 1982 Camaro I owned was all imperial. Cheers jason. And I own a 1972 Triumph GT6 which has metric from brake callipers, type 16PB Metric Otherwise the rest of the car is imperial except where I have made modifications. So the car is ambidextrous like me!
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dscott
Elder Statesman
Posts: 2,438
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Post by dscott on Mar 11, 2020 0:53:25 GMT
My personal Drawings for 517 (Fair Rosamund) are in both and working out rivet spacings in Metric is a doddle especially if they are going onto the computer. Even using a DRO advance 6.43 each time and the holes in the bunker get nicely spaced. The wheel drawings are metric as are the patterns but they look nice and no one asks.
March 1892 old enough to be living in the past for these delightful locomotives? I got inspired by a model photographed in Model Railway Journal and contacted Tony Reynolds who sent me the drawing. To think Wolverhampton GWR Works once had a drawing office and DID THEIR OWN THING well away from Swindon. Rebbles. They even had their own Engine Colour which bordered on Black. Now if I begin a Night Shift I may be able to progress quicker. Mine will have 2 numbers 555 and 526 on the cover sheeted tanks? A slightly rougher tank on the inside which is cheaper to build and the outer just bolts on to finish.
Think time to ponder the numbers!!!
Regards David and Lily.
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Post by mugbuilder on Mar 11, 2020 2:17:35 GMT
Who cares anyhow? 'You pays your money and you makes your choice.' Use metric if you like but try to make a nice scale engine using hex metric screws with large heads or socket head cap screws and try making boiler fittings with common metric threads.If you make large narrow gauge 7-1/4" gauge engines you can get away with it but not so easily on fine scale 5'gauge stuff.It's a free hobby . Do as you like and let the rest of the world go its own way. Here in Australia we are fortunate to have a very efficient supplier of almost all things for the hobby and a simple phone call or text message and a few days later it arrives. Why bother looking to complicate things? I have managed for over 60 years so I guess that I AM living in the past. 60 years ago it was a lot harder than it is now as there were very few specialist suppliers. We are all so spoiled for choice now. Live and let live. .
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Post by suctionhose on Mar 11, 2020 5:08:39 GMT
I don't know what, besides a heads up for Simplyloco's article, this thread is about.
All I can say, as one of the 'old farts' / 'refuse to change' / 'living the past-ers', is that having 'modern ways' thrust upon me, I have become the most unproductive person I have ever been in my life. People have completely lost the concept of evaluating time vs results. Easy is the only measurement now. The money and time that is wasted being fancy these days is shocking.
Thankfully, my workshop downstairs is old fashioned, traditional, bare basics and when I'm utterly fed up with 'modern-ness', I know I can go back to my 40 year old methods and make rapid progress! What a saviour! Why on earth would I want to change???
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Post by simplyloco on Mar 11, 2020 8:58:11 GMT
I don't know what, besides a heads up for Simplyloco's article, this thread is about. SNIP Strangely enough, my newsletter/EIM article was not about threads! I wrote about the use of modern materials: unstressed 3D printed parts, using tufnol instead of castings, titanium for sheet metal work, and the use of POSCA paint pens for lining out, all of which has appeared previously on here. Interestingly -predictably?- at our SSME AGM last night it transpired that not one member had bothered to read it. I rest my case... John
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