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Could someone help me understand how these coils fire? I know they get a signal from the ECU, but what is the signal? 5v? How can I do a bench test and make them fire the plugs? I know they are wasted spark, and one pin fires 1 and 4 the other pin fires 2 and 3. Thank You

Hi, I finished Stewart Harts (Potty Engineering) design of the Simpson & Shipton steam engine. It was built from all bar stock, except the flywheel. I bought a flywheel casting from Martin Models. The piston, I wanted to try a carbon rod. Wasn't sure if that would work, but so far I've had it...

I have a question.... I want to cut a 50 tooth gear with a single tooth gear rack cutter. I drew it on CAD and it doesn't look like I thought it would. Do I have something wrong with my math? The DP is 8, so the circular pitch would be .3927 If I cut in the center of my 6.25 diameter part...

Does anyone know a place I could start..........ACAD is the main cad program I draw with. I would like to know if there is a conversion program out there that will convert the DXF file to a CAM file? The place I worked at for years, we used virtual gibbs, but I can't afford that! Just wondering...

Hi I was wondering if anyone would be interested in buying Gypsy castings? I had a set made for myself and the foundry has more made. I bought the prints from John Chenery about 4 years ago, and he said he will sell the prints but not the castings. I have tried to email John again, but he...

I am going to build an electric foundry like Budgie (www.budgiemetalworks.ca). Can you guys tell me the pros and cons on what crucible would work better? Clay graphite or silicon carbide?? thanks

Hi I'm new to the board. I'm having fun trying to read all the past posts. I have a question about a valve. The latest Model Engineer issue has a build involving the Gothic Novelty beam engine. There is a guy selling casting kits and plans to build this engine. He also has many more kits to...