Don & Achim, thanks for the nice comments and your continued support.
Here are some more progress photos from the Otto & Langen.
Continuing with work on the exhaust valve cover; it is flipped around in the lathe and a ball end mill is used to hollow out the inside cavity.
Then moved over to the mill to square up the flange and drill the mounting holes.
In this picture the exhaust valve reed is sandwiched between the two pieces of stock to drill the mounting hole. The valve is made form .002” feeler gage stock.
Next the base has been laid out and sawed roughly to shape.
Using the rotary table the facets are machined and the decorative ball end mill detail is also added.
Back in the lathe the center bore is opened up to accept the cylinder/column.
Here is a family shot of the progress to date.
After some discussion and arm twisting it was decided to not make the exhaust throttle valve that is part of the original prints. It is not a particularly good looking valve and way too large for the rest of the engine. I had this little union cock and offered it to max and we both think it looks much better. It will eventually have a length of 1/8” brass tubing added to finish it off.
Thanks for checking in,
Dave & Max