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From Kits/Castings / Re: 1909 Mercedes Aero Engine
« Last post by steamer on June 23, 2019, 02:50:26 PM »
That's looking a treat Steve.   Those castings look amazing as well!

Your Own Design / Re: By Jupiter
« Last post by steamer on June 23, 2019, 02:48:36 PM »
Beautiful Mike!......yeah I'd make the nuts....

Your Own Design / Re: By Jupiter
« Last post by fumopuc on June 23, 2019, 02:09:58 PM »
Mike, a simple wow.
I donīt want to get hit by one of these ends.
Your Own Design / Re: By Jupiter
« Last post by Chipmaster on June 23, 2019, 02:08:47 PM »
Your Own Design / Re: By Jupiter
« Last post by Jasonb on June 23, 2019, 01:50:32 PM »
That looks the part.

As for the nuts I would have thought you and the CNC could do them blindfold compared to the other complex parts of the engine.
From Kits/Castings / Re: Stuart Major Beam Engine
« Last post by Chipmaster on June 23, 2019, 01:48:36 PM »
Hello Richard, yes Iím in Redditch, good to hear from a MEM member who lives just a few miles away.
We often drive through Inkberrow, yesterday we must have driven past you on the way to Croome Court. I finished an Alyn Foundry Robinson hot air engine earlier this year and I machined fish bellied connecting rods for a Stuart Twin Victoria. Iíll send you my phone number via a Personal Message.

From Kits/Castings / Re: Stuart Major Beam Engine
« Last post by ettingtonliam on June 23, 2019, 01:30:21 PM »
Impressive stuff on the beam engine, its one I always wanted to do myself but never got around to.

Am I right in thinking you are in Redditch? I'm in Inkberrow!
I'm half way through an Alyn Foundry Robinson hot air engine, and getting into a 7 1/4" gauge Locomotion, but I don't think we are allowed to talk locos on here.
Doesn't the beam engine have some long slender fishbellied rods in the valve gear and parallel motion? If it does I'm keen to see how you do them. Locomotion has a number of rods, about 8" long 7/32" dia down to 3/16" dia with a fishbelly profile. I'm at a loss to know how to machine them. The only way I can think of is to spin them up in the lathe at a decent speed, and attack them with a series of flat files followed by emery cloth.

Your Own Design / Re: By Jupiter
« Last post by Vixen on June 23, 2019, 01:30:06 PM »
My battle with the 'brown stuff' is almost over. The 40 inch diameter propeller for the Jupiter emerges from an enormous pile of sawdust. It was a slow and dusty process but deeply satisfying. The smooth flowing lines of the blades are incredibly therapeutic to stoke and fondle when all the hard work is over.

Eight laminates of West African Sapele Mahogany were sawn to shape (slightly oversize) and bonded together with Cascamite Urea-formaldehyde resin. When fully cured, the laminate stack was roughed out against the end roller of a belt sander. The blades were then brought to the requires profiles by hand using only 60 grit Aluminium Oxide sand paper and a set of accurate templates. The sandpaper was glued to flat and round backings, these proved to be very durable and the sand papers did not need to be replaced frequently. The process was slow and produced an incredible amount of saw dust. Unfortunately the weather was unreasonably wet for the time of year, so most of the work had to be conducted inside the workshop. I expect to be cleaning up the dust for months.

When the blades were finally to the correct profile, the propeller was mounted on a spindle and balanced. Quite a bit of extra sanding was required to achieve a balance for both blades and both sides of the hub. Fine sandpaper 150 grit was used to smooth the surfaces before several coats of Danish Oil were applied. Danish Oil is a mixture of Tung Oil, Linseed oils, which are air drying natural oils (oil seeds) which seal the wood surfaces and emphasises the natural grain of the wood.

I will let these pictures do the talking.

I will do the final assembly to bolt the splined hub into the propeller after the final coats of Danish Oil have been applied and allowed to cure. I expect I will need to add an extra coat of the oil to one side to restore the balance of the blades.

Does anyone out there know of a supplier of 2BA castellated nuts? It would be good to find eight of them for the propeller hub bolts.

Stay tuned


From Kits/Castings / Re: Stuart Major Beam Engine
« Last post by Chipmaster on June 23, 2019, 12:31:33 PM »
Hi Dave, yes a bit horticultural. I've been pruning lots of bushes this week in particular a row of Berberis (nasty thorns) that was getting out of control.
I agree with you about reasons for working to hole sizes. However, I became too enthusiastic and started work on the crosshead, if it all fits then I'll consider myself lucky but having worked out the procedure to make it I won't feel too bad if I have to make another. I'll start on the Parallel and Radius Rods this afternoon if I have suitable material.

Yesterday we drove to Croome Court (National Trust near Worcester) in my wife's MX5 with the roof down and got sunburned - some people never learn ! :facepalm2: ::) so not fit for model engineering yesterday evening.

Piston rod crosshead 1 by Andy, on Flickr

I started with a 7/8" bar of mild steel  (believed to be EN1A) and turned down one end to 5/8" to fit in a multi collet chuck and an ER40 collet and square block later on and proceeded to turn it to a bobbin shape.

 WP_20190621_14_10_46_Pro (2) by Andy, on Flickr

WP_20190621_15_20_13_Pro (2) by Andy, on Flickr

Using a parting tool for the 9/32" diameter sections.

WP_20190621_18_04_55_Pro (2) by Andy, on Flickr

Leaving about an eighth of an inch stub for the centre which will be removed later. This is where I'd got to Friday night. My plan is to mill the central section into its rectangular shape with the crosshead still attached to the bar, held in a square ER40 collet block or a dividing head.

WP_20190621_18_14_39_Pro (2) by Andy, on Flickr

Hi Bill, I'm not surprised it disappeared off your radar, it had been left untouched for three years!


From Kits/Castings / Re: building the Frisco Standard Model
« Last post by Chipmaster on June 23, 2019, 11:28:00 AM »
Excellent, looking forward to a long video of your engine.

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