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Post by Rob on Oct 22, 2014 21:05:26 GMT
Sorry, was thinking tube! Finished size is 9/16", so about 5/8" I'd say!
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Post by ejparrott on Oct 27, 2014 9:23:42 GMT
Relevant page from the Acenta Steels catalogue I would be able to get 135mm En8
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Post by Rob on Oct 27, 2014 19:15:22 GMT
Thanks Ed, forgive me if I'm being dense, would those be solid discs?
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Post by vulcanbomber on Oct 27, 2014 19:45:05 GMT
It would be from Acenta..... You can trepan the middles out with relative ease, giving you some handy size bits to make more of your engine from.
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Post by Rob on Oct 27, 2014 20:04:11 GMT
I'm not sure if my little Myford would be up to the job of trepanning something of that size. Perhaps I should give it a go and see.
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Post by Roger on Oct 27, 2014 20:50:24 GMT
Slowest speed, loads of coolant and razor sharp tools ought to do the job. Use power feed if you have a feed fine enough then put the kettle on.
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Post by vulcanbomber on Oct 27, 2014 21:12:12 GMT
I'm not sure if my little Myford would be up to the job of trepanning something of that size. Perhaps I should give it a go and see. Take your time, its not a race remember, also do it with 3 or even 4 different diameter plunges, a couple off mm deep at a time. And as Roger said, use the lowest RPM you've got taking the last 10 thou out..
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Post by donashton on Oct 27, 2014 21:33:36 GMT
Hi Roger,
Tried putting the kettle on, as you say, but it just trepanns a big hole in the bottom and all the water sloshed over the lathe bed.
Don.
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Post by vulcanbomber on Oct 27, 2014 22:51:13 GMT
Hi Roger, Tried putting the kettle on, as you say, but it just trepanns a big hole in the bottom and all the water sloshed over the lathe bed. Don.
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Post by ejparrott on Oct 28, 2014 9:24:43 GMT
Thanks Ed, forgive me if I'm being dense, would those be solid discs? Yes, but I can knock the middles out for you if you can't get thick walled tube.
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Post by Rob on Oct 28, 2014 11:14:32 GMT
That's very generous Ed, I'll PM you when I get in later!
Cheers,
Rob
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Post by Rob on Oct 28, 2014 22:15:46 GMT
As I'd like to redesign the buffer beams to be more prototypical, I thought I'd like to buy myself a drawing board. After spending half an hour googling the various offerings, I decided it was probably better to join the 21st century and look into CAD. See my CAD thread for more details. After downloading Cubify Design, and having a quick play around this evening, I knocked up my interpretation of a set of GWR 15xx buffers and stocks using the drawings of Doncaster's buffers that Pete very kindly posted for me as a guide. I want to make the buffers captive, with a spring retaining plate as full size, without the large nut on the back that you often see and as is drawn in the plans. I have to say I'm very impressed with the software, the way it works is very intuitive and you can build up assemblies as shown above from individual parts. There are currently two parts, made as they would be in reality - the buffer stocks and the buffer heads themselves. Once you've modelled each, you bring them both together et voila! I now need to model the socket, and the spring retaining plate, and jobs a good'un . Oh, making them out of metal might be a good idea too... Cheers, Rob
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Post by Roger on Oct 28, 2014 23:02:58 GMT
Very nice Rob, but check the size of the buffer head against the Wiki, you'll find the size of 1501's there. The plans show ones that are too small in diameter and too thick. Yours look a lot more like they should be so they may be right already. The flange part on 1501 is made up of two plates. The small nuts you can see in between the corner bolts are the ones that hold the back plate against the spring. You can see some full size pictures on my Flickr album
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Post by Rob on Oct 28, 2014 23:44:41 GMT
Hi Roger, I was using your pictures as a reference actually, in an attempt to guess the buffer head size and rough shape. I guessed at 1.5" compared with 1.25" as drawn, so I wasn't too far away from 1.413" . I'll redraw them to the correct dimension!
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Post by Roger on Oct 29, 2014 7:51:07 GMT
I guessed them too initially and was even closed by pure chance. Alan kindly ran a tape measure over one to get the right size so I know it's how it should be.
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Post by Deleted on Oct 29, 2014 8:36:02 GMT
Blimey lads !------- going down to 3 decimal places on buffer heads ? -------- that's dedication for you
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Post by Roger on Oct 29, 2014 9:45:08 GMT
I just hope you wiped the grease off before you measured them Alan, I'd hate to have to go back and make them smaller.
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Post by Rob on Oct 29, 2014 13:50:55 GMT
Oh no, you mean there's a chance we've included grease allowance?! They could be microns out now
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Post by Roger on Oct 29, 2014 14:59:46 GMT
Exactly, Alan has a lot to answer for....
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Post by Deleted on Oct 29, 2014 16:59:26 GMT
In Naval parlance I'm just an "Auld Buffer" anyway !!
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