Recent content by Foketry

For my aluminum castings I use both ingots and scrap machined pieces to be melted again but all of the same type of aluminum (Al Si 9 Cu 3) (USA ASTM B179-82 333.1 - 332.0 ) This aluminum alloy can be hardened and aged artificially, but I have never tried, sooner or later I will. Hardening is...

Lost PLA, Harley Davidson heads I tried to make the heads with the lost PLA technique to avoid hours and hours of milling, some positioning on the milling machine. I thought it would be difficult to obtain cooling fins with a thickness of 1.3 mm but I wanted to try. The technique for making...

My new tool, 3D edge finder, to find the center of the workpiece on the milling machine it is completely automatic, with a small program, it resets the origins of the piece, X axis and Y axis or Z axis

The complete cylinders, with Viton O'Rings

The cylinders Terry who has already built this engine suggested lengthening the cylinders, to be more similar to the original. In this drawing the black part at the top is the elongated part compared to the Draw Tech project ,of course I also had to lengthen the connecting rods by the same...

Milling of the connecting rods some discarded pieces, I redid the outer connecting rod 3 times due to carelessness

The assembled crankshaft, with an external alignment cylinder during the finishing turning of the shafts . first step, right side second step , left side Final check of the coaxiality of the 2 shafts, without bearings and with bearings Max error detected 0.03 mm

For the connecting rods I provided bronze bushings, mechanically the needle bearing are better, they have less friction, but the bushings are simpler and more robust.

the 2 flywheel shafts have an allowance of 0.5 mm, when they are assembled with the flywhee , connecting rods and the pin , I will do a final turning to ensure alignment and concentricity . The assembly was done with a press. CNC turning of the connecting rod pin the defective pins, 5...

The crankshaft My Knucklehead engine is larger than the Draw Tech project, the diameter of my piston is 36mm compared to 27 mm, 1.33 larger , so everything will be larger than the photos of the components that you have already seen in other constructions. The total displacement of the engine...

It is brass obtained from old taps , I don't know what brass alloy it is, but no particular mechanical properties are required in this flywheel

The flywheel, brass casting

left crankcase

Other aluminum castings, always with the same procedure , 3D project, plastic model, cast in red sand Cover cam box and Cam box

To make aluminum castings the first step is the 3D drawing of the finished part, then I eliminate all the holes and machining, add the allowance in the milled or turned areas, add an increase that takes into account the aluminum shrinkage . Finished right crankcase drawing for casting mold...