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many years back, for a a small steam tractor I was doing, I did the castings by myself for the wheels, with recycled zamac or the like, very easy to do I thought, I was very proud of my first own castings ! This is the point, now, some 15 years later, the cast parts are completely...

You may have a look at the way music instrument maker now repair dents in brass saxs, trumpets or others instruments : with a strong neo magnet outside and a polished steel ball inside (many videos on the Net). It looks really magic with thin brass, but with steel the magnet would not work so...

This one is a copy of a pic from a model expo report in Model Engineer vol 170, p 210, issue 3939, 19 feb 1993. Alas, no other info can be gathered on the model and its builder, only “flame licker engine by David Hanstead”. A radial engine, yes, but I don’t even know if it is a true rotary...

all these links look awsome, and the brass cornice with rounded edge too. you finally succeed in deciphering the plan for the gab ends, brilliant. Is your workbench, which is paved with wooden bricks, as seen in the pics ? classy

An other way to estimate areas is to copy the design onto cardboard, cut out the shape, weigh and compare it with a standard, I did that when I was student ! this one is the planimeter of Oppikofer (1827). The point p follows the perimeter of the curve and the counter V measures the area...

As drawn, this type of joint require a gib and cotter inserted into a slot in the strap and the central part, which grip part together. Obviously the central part must be split in any way to be able to tighten the slit bearings on both sides, this is not clear in the original drawings. Each part...

You will find the responses in the late Charlie Dockstader Valve gears simulator programs (still available on the net), may require head scratching sometime, but the programs work. By changing data (ie link length or angular setting) through the use of the dynamic variables, you should see their...

The design of the pumps are all different for the feed pump, the circulating pump, the eduction pump, and the air pump, the later being much larger with a valve though the piston; if you add a bilge pump for a marine engine, it gives the opportunity to become an expert in pump making.

ok, I agree with you for Newcomen, too many shortcuts causes errors at the end. For having made a lot of vacuum engine, I can say that the drag due to water is a major problem in your project. But it seems also true that with steam, many problems are eliminated as : excessive stress due to heat...

This what the Newcomen engine do, breathes steam, then condenses it, and the vacuum allows the return to the initial position. A 'classical" flame eater engine can't stand the condensation, the drag is too high, and the engine stops immediately. This is well known and always occurs at the first...

this thead deals with what you are planing to do: http://www.homemodelenginemachinist.com/f31/compound-condensing-engine-14725/ drawings also are in the download section

Many in the IC engines you can admire here are not scaled down, they are plain working engines just small or very small ! physics (sparks etc...) cannot be scaled down.

Impressive examples of fabricated parts in the previous posts ! have a look here this fellow have a plan to download for a two cylinder engine with detailled fabrication (by brazing) of sub assemblies : cylinder block, stands etc... This engine looks very similar to the one you show. You may...

This is a non working volume of wasted steam at best. This dead space serving in turn for the steam admission and exhaust, undergo temperature changes causing condensation highly detrimental to the performance. However, on a mechanical point of view, a small proportion of dead space is good...

hi here are my views on this puzzle. I read the paper, yes not much clues, apart the way to make your own wood screws ! as said Jason, the pivot is locked in place by a sliding plate. but in addition as said in the text, the slide may also prevent the pin to slip into gear accidentally. a small...

hi have a look at this one too, from my "to do" list, an old timer 2 strokes (spark ignition !) 2 cylinders in line, as 2 independent engines. the pdf for the complete blue prints and instructions build (in french) is here...

Hi, in the post #16 you write " Since the Eccentric which moves the valve is fixed to the Shaft at 90 degrees with respect to the crank pin which moves the Piston,..." but it is usually not so, you have to add some lap on the valve and advance the setting of the eccentric accordingly, to allow...

With a short and stout boring tool, for the rim side, then moving the same tool on the oposite side of the hub, you cut the hub side with the lathe running backward. Of course, a carriage stop is mandatory to get same depth, for an invisible joint. With a rounded tool, no need for a finishing...

this engine will surely be worthy of the fabulous drawing of G. Gentry. beautiful workmanship

Hi, nice photographs, simple and clever design. in all your posts I see that you are addicted to tangential tools. I would have to try one someday, maybe I would make nice engine too...