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John W You just wind back the other way. Providing the turns are all in the same direction, it really doesn't matter how you go about it. You are only using low voltage so the voltage difference between turns is minimal. If you were winding a high tension coil that would be a different matter...

Brian I have just (almost anyway) finished a Fairbanks Morse R80 which is a three cylinder engine and it is fitted with three igniters. The principal as to how they work is simple however, making them so small is something else. Mine are oval in shape approx 12 x 8 mm. I have plenty of info...

Minh I have been following this discussion with some interest and there have been some useful comments so I will add my ten cents worth. When building a model diesel say 6th scale or less, there are some aspects of the combustion cycle that are difficult to replicate in terms of the real...

Peter I have been down this path many times in that I have converted a lathe and a couple of mill plus CNC routers. Depending on what your end game is will determine the path you take. For example, if you just need power feed on either the X or Y travel the solution is quite easy depending on...

Peter You can make almost anything work and I am happy to help you. I have helped many people sucessfully with this project over the last couple of years. The original Arduino sketch would only work for 90 to 1. All other ratios were inaccurate because the sketch used integers rather than...

Minh I refer to my original comments re injectors and the difficulty of getting a good seal with the injector nozzel. I would suggest that you spend a few dollars typically $10 Au and purchase an injector nozzel via ebay of the pintle type or see if you can scrounge one from an injector repair...

I have spent some time looking up info re hot bulb engines and there is not much about. There are a couple of links which you may find of interest: Hot Bulb and Glow Plug Difference | Model Engineer This article gives a good run down on the operation of the hot bulb engine. The next link...

Steamchick Re gears What I thought would be a simple task has proven to be quite difficult re suppliers of suitable gears. I haven't been able to track down the US supplier but will keep looking as I will have it some where. The price delivered to Australia was $96 Aust and that was two and a...

I will answer the questions as follows: The 2:1 gears used on my prototype were purchased out of the US and were of a very good quality. They had both types e.g. conventional square cut gears and the type I used. I will track down the supplier and advise. If you need square cut gears, there is...

Model stationary diesel engine plans - a rare item indeed. It is not that difficult to build a self ignighting engine and model aero engines are a good example. Fine Hanson (Denmark) has built many fine examples however, he is not interested in sharing his designs or information. His engines are...

Don Building a CNC router is not overly difficult however, you need to decide early on just what you intend to use it for and then design around that requirement. I built mine to machine everything from mild steel, aluminium, brass, plastic and I have also cut carbon fibre. I have included a...

Going back several posts, if you shorted out one pole of the motor, then it should survive as the driver is current limited. If you shorted adjacent poles the outcome could be problematic and to work it out would take a little time via vector anylises. I suppect that this is the case and you...

Dave Thanks for providing the link for Mike. I can now add the photos to my collection as every one adds some value to the project. Your knowledge of some of these sites and people is amazing and I value your input. Bruce Western Australia

Mike The Fairbanks Morse R80 is an interesting engine and I have found ten or so examples on U Tube. Most having been built ten or more years ago. The original plans and castings were produced by Pacific Model Design back in 2002 so quite a while ago. I had no luck tracking them down an...

Minh I have been following your post and noting the various comments which I think you will find useful. I will add to the discussion with my own experiences re building a true model diesel. Just over 2 years ago, I decided to attempt to build a true diesel e.g. one that runs on diesel and uses...

I have been working on this engine for about a year now making slow but steady progress. The engine is now complete with pistons and turns over quite freely without rings fitted. I am now onto all of the fiddley bits which take all of the time. Note, I CNC cut all of the side covers so any...

Dave Firstly, thanks for responding with the head information including the CAD drawings. I think I will machine the critical parts and then tackle the head cooling and I think you are correct that the head studs pass through the water jacket. That was one of the things that I couldn't...

Dave If you have a set of castings, you are very lucky as they are almost impossible to locate. However, if you wouldn't mind, a couple of photos of the head casting would be very helpfull. Seeing the casting I think would make the intent of the drawings clearer. My engine is all from bar...

Thanks Dave, I will give him a try. Bruce W-S