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Thread: Brass blocks need help to find
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30th Sep 2019, 09:50 AM #16Most Valued Member
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I was just about to start the search for this size also starting with Surmans in Adelaide then George White ...
now I have Edcon thanks guys
but I did also have a plan B.....ask one of our foundry members to cast me a block...i can supply the scrap brass
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2nd Oct 2019, 09:22 AM #17Most Valued Member
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alternative I just thought of.... stainless steel?
it is the steam chest and brass was used to combat corrosion i guess....so in theory we should be able to use s/s
or even steel providing we keep it lubricated?...couple squirts of oil every time we fire it up with aircompressor?
Surmans in Adelaide was $71.50 for a 200L x 52x52 hunk of brass
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2nd Oct 2019, 08:41 PM #18Senior Member
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Hi Eskimo, SS would be an alternative for sure, however I've previously found that SS (316 which I machine a lot of) is quite a hard material to machine so the hand finishing of parts, I'd expect, would be a difficult task particularly if the model was to be a bit of a "show piece". The other components that attach to the body are also a little complicated with all the slots, steam passages etc. that require quite small drills and end mills, which I've found by previous experience have a high tooling mortality rate. I think I'll stick to the plan re: Brass cause it polishes well and is easy to machine. The steel would be OK too but things rust where I am so the whole engine would need to be an oil/grease ball to protect the external surfaces. PS I plan to spray the finished components with a clear coating process to combat oxidation and corrosion.
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3rd Oct 2019, 10:23 AM #19Most Valued Member
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I will be painting mine
oh and I will let you get in front of my build ( not that I am slow or anything like that) but just so you can tell me of any other errors you find along the away.
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3rd Oct 2019, 07:33 PM #20Senior Member
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Noted Eskimo
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14th Oct 2019, 10:12 AM #21Most Valued Member
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spotted another error with the drawings...i think
the centre to centre of the two piston conrod journals is 60.4 ....if using the crankshaft measurements of the crank shaft drawing..ie 7.5+7.5+8+8+29.4=60.4
yet the centres of the two cylinders is shown as 66.3 on the drawing of the brass body and cylinders.
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14th Oct 2019, 04:45 PM #22Senior Member
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14th Oct 2019, 07:21 PM #23Most Valued Member
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15th Oct 2019, 09:28 AM #24Most Valued Member
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yes you are right hpa1
The latest drawings that Stewart sent me has been changed from 29.4 to 35.3
old pic
old Fly Wheel and crank Shaft-Model.jpg
thanks for that I will destroy those in shed and work off the latest.
But beware of other errors hpa1
edit. just checked what I put up in other post and that file is a copy of the one Stewart sent me. I will destroy the old file.
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