abby
Statesman
Posts: 925
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Post by abby on Jul 28, 2007 14:11:15 GMT
Hi all , as there doesn't seem to be much going on at present I thought you might like these pictures of a project just finished for a modeler cousin from the other side of the Atlantic. I know their gauge 1 isn't the same scale as ours and they seem to like engines that look like gypsies drive them LOL! but they are great enthusiasts and no mean modelers . These castings ,as yet un-fettled ,are for that sodding great search-light that they put on the front of their loco's , they are about an inch square and I am glad I didn't quote to drill the hinges! Although a beautifully made pattern was supplied it was only used for dimensions ,the wax patterns were made using high pressure wax injection and 3 dies had to be made ( the legs are made seperately and glued to the body before casting) from aluminium tooling plate. It mills nice but clogs tools like nobody's business. I believe these are to be working lamps. if you are interested you can see more pictures at www.unionsteam.co.ukAbby.
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Post by modeng2000 on Jul 28, 2007 15:53:30 GMT
Abbey,
I found the pictures very interesting. My son used to be a dental technician and so some of what you show I am familiar with. The lab used a vibrating device to de-gas the investment but of course things were on a much smaller scale. They also used a centrifugal casting technique to ensure the gold reached all the corners.
John
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Post by Tel on Jul 28, 2007 20:39:20 GMT
Very impressive Abby - they'll be very nice indeed ehrn finished and mounted.
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Post by Deleted on Aug 1, 2007 6:42:34 GMT
I used to pop the wax filled mould onto my running jigsaw, soon gets rid of any bubbles!
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abby
Statesman
Posts: 925
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Post by abby on Aug 1, 2007 15:50:31 GMT
Thanks for the tip usra , but my patterns are made in high pressure injection dies so no bubble problems there , I do have a vibrating table for shaking out bubbles during investment but it is fierce and can sometimes dislodge a pattern or two , I generally find that vacuum degassing after careful placing of the patterns ( try to avoid making traps ) is enough.
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abby
Statesman
Posts: 925
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Post by abby on Sept 10, 2007 4:44:41 GMT
Just cast the "production version" of the wheels for my G1 DOT , thought you might like to see one !
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ace
Statesman
Posts: 528
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Post by ace on Sept 10, 2007 9:44:09 GMT
Hi Abby
Nice work, I have for the time being suspended my work on the G1 project as I am finishing off my steam crane ready for the MES at Leamington in October, just a bit of spit and polish and a pressure gauge to go then its finished.
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Post by GWRdriver on Mar 9, 2009 16:39:29 GMT
Abby, The prototype of this headlight was manufactured by the Pyle-National Company of Chicago which is very much still trading, but not in locomotive headlamps. Pyle produced a number of headlamp designs in various sizes for locomotives but if someone were to mention only the "Pyle" electric headlamp this model is what they would have had in mind. These replaced the arc type headlamps and began to appear after about 1920 or so and actually, as US headlamps go, it's a bit on the smallish side.
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abby
Statesman
Posts: 925
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Post by abby on Mar 13, 2009 20:50:26 GMT
Thanks Harry I make lots of bits for people and never know exactly what they are , by the way I LOVE american loco's , there almost as beautiful as british , and the jokes are just jokes !
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