Building the Arden Super Atom from castings updated 28/05/2012
In May 2012 I purchased a set of castings for this engine from Ebay for just under £11. These castings are magnesium and very fine die castings. This wasn't an engine that I had planned to make but the more I researched it the more interested I got. I had some good advice from Ron Chernich and Ken Croft (two of the Motor Boys) Ron also put me in touch with Eric Offen (another Motor Boy)who kindly offered me a set of plans.
There is a page of information about this engine on the model engine news page here.
I have ordered the fuel tank for this engine from Woody Bartelt and I now have a set of drawings (thank Eric)
I will keep a blog of progress here.
The tank parts have arrived from Woody Bartelt and I now have a set of drawings (thank Eric)
My first task is to use the drawings to produce a 3D model of the complete engine. This will give me a really good insight into the complexities of the machining and also be a source of information for the jigs I will need to make.
26/05/12
I have now modeled the major parts of the engine and this has shown up a number of missing dimensions and a couple of incorrect dimensions. I still have to model the timer and the tank.
The exploded view of the engine
The engine CAD model is nearly complete
This is the timer assembly
28/05/12
Having completed the CAD model I have found a small number of missing and incorrect dimensions. I do plan to do a set of drawings for my own build but, here are the changes and updates that I have penciled on to the drawings that I have.
I have also made a couple of minor changes to a couple of components to simplify manufacture. I have replaced the 2 semi-shears used to locate the front spring with riveted on parts so that I don't have to make special tooling to punch the semi-shears. I have replaced the insulating parts that consisted of 2 washers and a bush with 2 tophat bushes.
Drawing updates:-
Drawing SA-011A CAM ARM: Dimension now 0.132 was 0.100 & Dimension now 0.250 was 0.275
Drawing SA-006 CRANKCASE: Missing dimension for end of throttle valve face should be 0.322 (from 3D model)
Drawing SA-004 CONROD: Angle now 115° was 114°. angle now 125° was 122°
Drawing SA-003 SUB-PISTON: Dimension now 0.226 was 0.290
Drawing SA-001 CYLINDER: Missing diameter at top of cylinder should be Ø0.70 (scaled from drawing)
