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Your Own Design / Re: 1/4 scale Porsche 917 180 degree V12 Build
« Last post by steamer on Today at 08:23:51 PM »
Dave,
On vacation, it's good to sit down and have the time to get cought up with your build. One question, how much of a gap between the two halves of each throw? I am following that the bearing in between locates the faces. Presumably the gap doesn't matter so much. I do have a pdf of the Schilling book but "mein Deutch ist sehr schleckt" is there an English version available? Wonderful work!
Art

Im shooting for an .0005 interference fit.   :ROFL:  As a bush it is that, and the caps close up completely, and the bush is immobile.         That's the target anyway....we will see.
the fixture is going to be a key component in this operation, splitting these bushes exactly in half is what Im going to try to do.     Then I'll need a fixture to hold them for final boring while clamped.....it's going to be tedious at best!     this is pushing me to a level of consistency that I'm not sure I can do....but I will try...and the only down side of trying is scrapping some bronze bushes....so the risk is pretty low.....comparitively.

Dave
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Your Own Design / Re: Chris's Build of Steering Engine
« Last post by crueby on Today at 08:11:05 PM »
Chris, thanks for showing.
Now I know how to make the connecting rod on my Nicholas. It looks good the way you do it. 👍
:cheers: :cheers:

Rod's looking great Chris!  :ThumbsUp: :ThumbsUp: :ThumbsUp: :popcorn: :popcorn: :popcorn:
:cheers: :cheers:
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Your Own Design / Re: 1/4 scale Porsche 917 180 degree V12 Build
« Last post by Art K on Today at 07:54:54 PM »
Dave,
On vacation, it's good to sit down and have the time to get cought up with your build. One question, how much of a gap between the two halves of each throw? I am following that the bearing in between locates the faces. Presumably the gap doesn't matter so much. I do have a pdf of the Schilling book but "mein Deutch ist sehr schleckt" is there an English version available? Wonderful work!
Art
4
Your Own Design / Re: Small Flash Single
« Last post by vtsteam on Today at 07:25:40 PM »
Today I shortened the housing to actual length by turning off the chucking extension. Then I bored the end for the outer ball bearing set.

The plate flange around the outside is still ovesized.

Next to do is drill the flange and crankcase for mounting screws and tap the case. I can then mount the bearing housing and mark the flange for trimming.

I've done things this way throughout in order to keep the crankcase (and cylinder) bore as the machining reference, rather than trying to relate to a particular point on the crankcase through a series of measurements.

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From Kits/Castings / Re: My A J Reeves Bolton Triple Expansion Engine
« Last post by simplyloco on Today at 06:29:07 PM »
Hello John,

Cross drilling those exhaust ports by hand. Scary stuff.    :zap:    But you got it done and it looks very good.

Mike

Thanks Mike. By my reckoning that's the hardest part of the beast complered: plain sailing from now on! :LittleAngel:
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Your Own Design / Re: Chris's Build of Steering Engine
« Last post by Michael S. on Today at 06:28:42 PM »
Chris, thanks for showing.
Now I know how to make the connecting rod on my Nicholas. It looks good the way you do it. 👍
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From Kits/Castings / Re: Nicholas
« Last post by Michael S. on Today at 06:10:58 PM »
The one with the Teflon tape as a piston ring is not my idea.
At the Regner company, which sells steam engines as kits, this was described in the assembly instructions.
It works quite well. Oil collects in the band and seals well.
When operated with steam, the Teflon expands. I think now they build special pistons made of metal and Teflon sleeves for their models.

I bought another Reeves casting kit yesterday through ebay classifieds. The Warriors.
Someone there offered it without a blueprint.
Let's see how the castings are made.
I think it will work without a blueprint. I know the bore and stroke.
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From Kits/Castings / Re: My A J Reeves Bolton Triple Expansion Engine
« Last post by Vixen on Today at 05:59:54 PM »
Hello John,

Cross drilling those exhaust ports by hand. Scary stuff.    :zap:    But you got it done and it looks very good.

Mike
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From Kits/Castings / Re: My A J Reeves Bolton Triple Expansion Engine
« Last post by simplyloco on Today at 05:39:56 PM »
The Cross Drilled Exhaust Ports
I'd forgotten about these! Very very important if I want the thing to work!
There are two exhaust ports in the main body, and this is a straightforward drill/tap exercise. I don't have the specified 26tpi taps, but 32tpi will be quite adequate for my needs!



The HP cylinder is connected to the main body by bolts, and these two recesses alow one to get one's nuts tight...



The exhaust (in the centre) ports have to be connected to the outside by another daft and dangerous cross drilling exercise!




The two 3/16" holes in the HP cylinder face go right through the body and connect to a cross drilling, which in turn connects to the exhaust port. Got that? 🙂



That thread in the HP cylinder is at both ends of the cross drilling, and will be sealed with a 7/32" plug.



You can see the port connections here. Two in the HP exhaust and one in the IP port. Clever stuff!


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Your Own Design / Re: Halfa, a DOHC inline Twin
« Last post by Roger B on Today at 05:35:34 PM »
Coming along rapidly  :praise2:  :praise2: :wine1:

I've had my 12cc twin over 8 000 rpm however that has ball bearings for main bearings.
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