A little Sleeve Valve Engine

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jim:
excellent :clap:

kvom:
Great work. Thanks for sharing.

spuddevans:
Very nice work there :thumbup: :thumbup:

Tim

NickG:
I'm pretty gobsmacked - the finish on those must be impeccable if the camera is not picking up machining marks that close up. :jaw:

Joachim Steinke:
Hallo out there,

now it was time for building the “cam”- and crankshaft. Actually this engine has no real camshaft in a classic way, so the thing which drives the sleeve is more a control shaft….

Both shafts are made from ETG100, a special steel with high mechanical properties combined with extraordinary good machinability. I like this stuff, the tensile strength is about 960 to 1100 N/mm2, but you can cut it like ordinary free cutting steel, it’s the perfect material for small and lightweight lathes and mills.

As my crank disk is relative thick (6.5mm) I could make a single, well fitted in crank pin (5mm diameter) which is glued into the disk with Loctite later. So I avoided the circuitous off-center operation and the extra fixture for the lathe.

Here we have all the related components before the assembling.

And here are all the bearings and gears already in place. The two gears are also glued with Loctite high strength on there precisely fitted shaft seats. I don’t have enough space for removable joints like a key combined with a shaft nut, but Loctite will do the job well.

And at last the whole assembly with the crankcase, the gears are smooth running and all is fitting well.

And today I started with the main cylinder. This component is made from spheroidal cast iron. Our German notation for this iron is GGG60, I don’t know if the name is common in the English language area too?

Grooving the cooling fins…..

and a little finishing work.

And now came the first fine machining of the cylinder bore with 400er grinding paste and an expanding lapping mandrel.

This is only a pre honing from the before turned 19.97mm up to now 19.99mm diameter, the final fitting with the sleeve (projected is 20.00mm) will be done after milling the cylinder ports and the frontal cut out for the sleeve drive.

Step by step the little engine looks more and more like a real motor….ha ha ha….

Good night from Achim

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