This is the most recent engine
to come from my small machine shop.
It's from a design by Rudy Kouhoupt, and the prints can still be had
the form of the book The Shop Wisdom
of Rudy Kouhoupt, vol I.
Kouhoupt was very popular with those of us who mainly use smaller
machine tools, in
the size range of the Taig lathe and mill, or Sherline and Unimat
machines. For years
he had a column called "The Mirco Machinist" in Home Shop Machinist magazine,
he would show how many things could be done on small machines. He
left us scores
of projects in the form of his articles and books.
Rudy passed away a few years back, but there are many of us still
building his designs,
and there is no reason not to continue. Everything I've seen from
him ove the years
was well thought out and properly drawn.
This engine took me about 2 1/2 months from first cut to running
engine. It could be
built quite a bit faster than that, depending on how many hours a day
I'm rarely in any kind of hurry when building something just for the
pleasure of it.
It is built completely from bar stock, using a Taig lathe and Taig
Flywheels are 4.25" diameter. Bore of .625" and stroke of
1.00". It runs nice and slow
on air at about 4 psi, and will really get right along on 20 psi.
Overall length of the engine is about 10".
Hope you like it!
Here's a short video of it running at various speeds between 4 psi and