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Old 17-08-18, 09:41 AM   #51
nickh
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I must admit I has forgotten that Martin - just re-read the rest of the thread to remind myself of its back story.

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Old 17-08-18, 10:57 AM   #52
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Quote:
Originally Posted by gaudin98 View Post
I believe this to be a replica. I was involved with the restoration of two genuine engines being a close friend of the Robinson expert George Whiteman. On the replicas the gugeon pin is not exposed when at bdc. on the originals the pin is seen half exposed. Also I believe the replicas used a Lister D type piston. The other give away is on the top of the water hopper. On the originals there are machining marks conducive to a planning machine. But on the replicas they where done on a more modern milling machine giving a surface finish with a radius as apposed to straight lines from a planer.
The engine was sold to me as a replica, it doesnít trouble me at all really - itís a great little engine either way.

Interestingly the gudgeon pin is exposed at BDC, I donít think the piston is Lister but Iíll have a closer look. There is an interesting mix of Whitworth and American threads so I do wonder if some parts are from an original.

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Old 17-08-18, 11:33 AM   #53
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Do we know who made the replicas and why ? Are they still making them ? Do they do other engines ? It looks like a really good job, to my un-trained eye.
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Old 17-08-18, 11:59 AM   #54
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The replica Robinson hot air engines were produced by well known enthusiast Edd Bolton back in the 1980's. Not sure if these were from the same source - if his son Gareth still frequents this forum, perhaps he could confirm or otherwise.

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Old 17-08-18, 12:15 PM   #55
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Have I been playing with engines that long, there was an interesting man. A tour around his sheds was a treat which our club did regularly.

Martin P
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Old 17-08-18, 06:58 PM   #56
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Peter Keating owns and regularly rallies a petrol powered Robinson and he fitted a Lister D piston to that. I don't know if it is a copy though, but I do know that it is a messy thing that seems to break down a lot!

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Old 17-08-18, 09:35 PM   #57
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Following on from Gaudin98's comment, here is a photo of the piston, it doesn't look very Lister but how does the gudgeon pin compare to others?

Untitled by Phillip Sheppard, on Flickr

Untitled by Phillip Sheppard, on Flickr

The engine seems to fit Wayne's description of a replica engine in every other respect.

Untitled by Phillip Sheppard, on Flickr

Untitled by Phillip Sheppard, on Flickr

Untitled by Phillip Sheppard, on Flickr

From the few short runs it's had, it does seem to be a very messy thing - chips must have been very greasy in those days!

Phill.
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Old 19-08-18, 09:53 PM   #58
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The bad weather this weekend has resulted in a productive weekend in the workshop.

The Robinson engine is missing the hot tube cap so I have turned one from a cast steel billet, once a jacking block under a large autoclave which I de-comissioned a few years ago.

Having turned the cap to size I set up the rotary table and drilled 6 holes.

Untitled by Phillip Sheppard, on Flickr

Untitled by Phillip Sheppard, on Flickr

Untitled by Phillip Sheppard, on Flickr

The cap just needs to weather in a bit now.

Phill.
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Old 20-08-18, 08:45 PM   #59
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The originals don't have that ring around the bottom edge of the cap, they were just plain.
Nice job though.

Phillip
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Old 20-08-18, 10:04 PM   #60
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How many rivets..?

I had a photograph of an original to make mine from as can be seen, just a little bit of “artistic licence” on my part, it could always be turned off if desired.

Phill.

Last edited by wolseley phill; 20-08-18 at 11:07 PM.
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