A Robinson from rejects.

[Alyn Foundry]

Thank's for that graham

Do you use a low pressure regulator on the propane cylinder? Also is there any form of demand valve, I would have thought not as the inlet valve acts much like a demand valve only opening when there is a vacuum in the cylinder.

J

Hi Jason.

No, my Robinson runs at 40 PSI from an adjustable HP bottle regulator. Not on demand.

Cheers Graham.

[Ian j]

so the pipe going up to the T comes from the regulator on the gas bottle?

[Alyn Foundry]

so the pipe going up to the T comes from the regulator on the gas bottle?

Good morning Ian.

Yes it does.

Cheers Graham.

[Jasonb]

Thank's Graham, standard torch type regulator it is then and not one of the flat LP ones.

Just need some castings now But I found something to do while I'm waiting

[Ian j]

Just a thought, Ray & Jason what are you plans on providing lubrication to the big end on the crank shaft, the drawing's show one method.
Have you drilled that 1/32" hole yet Ray?

[Jasonb]

I think the greaser that is suggested on the drawings is correct, you can see it on this full size engine. Anyone for a scratch built chipper?





Or what about a peeler?

[Alyn Foundry]

Good morning Jason.

How wonderful!

The pictures posted above are of the full size Robinson “ X “ type that you’re all making models of.

The engine belonged to Geoff’s wife and was loaned to me back in 1989 for both scaling and getting going. I took it to a local rally and got a mention in the paper as it was the oldest exhibit there.

Re. Lubrication. I would recommend an MS grease because the properties of Molybdenum Disulphides are well known and understood.

Cheers Graham.

[Jasonb]

Graham, (and other builders) I got those photos from the following, there may be some more updates on it's progress.

http://beamishtransportonline.co.uk/2011/02/potato-chipper-for-chip-shop-a-tongue-twister/

http://beamishtransportonline.co.uk/2011/02/chip-shop-chipper-update/

[Alyn Foundry]

Hi Jason.

As far as I’m aware the “ Chip shop “ project at Beamish was/is on hold, sad really.

However your links might give an idea for paint colour..... “ Manchester Red “

As a side note I wonder if their statement about the period advertising is correct? The engine in that picture has the epicyclic gearbox which was patented in 1894 and superseded by the more conventional two spur gears soon after.

Cheers Graham.

[Jasonb]

Well it's no secret that I do like a red engine Just had a look at teh manchester red which is not as bright as you see quite a few of these engiens painted in

http://www.craftmasterpaints.co.uk/colours/standard-range

I was thinking of using teh same red that I did on my Tidman and that looks reasonably close.

[RayW]

Hi all. Have been thinking about making a miniature spring loaded, or screw down, greaser to fit onto the big end cap, but need to check how much clearance there is when the crank revolves. If there is sufficient room, I would prefer to do it that way rather than drilling through the web and, therefore, through the web pins.

[Jasonb]

I've just come in while the crank cools from soldering, Drilled and tapped the axial hole before soldering and will off set that pin so it just nicks the side of the pin rather than drilling across the middle.

As the base casting is notched out to clear the big end fixings I can't see there being much room but can't tell until I have the casting

[Alyn Foundry]

Hi Both.

I've never pinned a Silver soldered crankshaft ever, not had a single one break either!

Attached are a couple of photographs of 103 showing how little clearance there is to play with and my alternative big end greaser.

Cheers Graham.

[Alyn Foundry]

I'd also like to share....

Don't forget to tighten your gudgeon pin screws!!

Look closely at the pool of oil at the bottom, no wonder they smoke.

Cheers Graham.

PS. When my cameraman gets a day off from work I'll do a short video of how easy they are to start and run.

[Jasonb]

Soldered up the crank and then gave it a quick clean up followed by drilling 1/16" for the pins. Loctited them into place and left to set overnight.



Peined them over and then filed flush followed by cutting the waste out of teh middle of the webs and cleaning everything up.