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I often put simply a kleenex in the inner hole of the chuck, but it is far from sufficient to prevent chips in the scroll while boring a piece.

lovely model you are making ! here is a link to the LBSC paper...

Very informative and useful thread, thanks to share your hints and experiments ! I certainly will have a go, I feel it just like an obligation to try...

I do have a drill chuck with a cylindrical tang that I hold in the ER collet chuck, for the drill that are far from a nominal dia of the collets...and certainly much faster when different dia have to be drilled.

If I understand, you are looking at a preheating plug for diesel engine to ease the cold start, rather than a glow plug for ignition in a RC engines ?

nice to see personal design in this area, and with such good results, congratulations, 0.021 that's pretty small.

You may use silver too, I did several sparkies engines, 2 strokes models from a vintage (1937 !) magazine, and as suggested in the paper, I did ignition points with silver disks, (3mm dia and 1mm thick), soft soldered on copper rivets, and it worked a threat, and are still working. I was very...

look at this one, Arduino based with Hall sensor, simple and cheap to make. https://makersportal.com/blog/2018/10/3/arduino-tachometer-using-a-hall-effect-sensor-to-measure-rotations-from-a-fan

I guess that your condenser is far too small, if it full of water... you need several pumps, one for circulating cooling water, one for air and water and one feed pump for the boiler.

many organics are no more allowed to be used for thermal exchange ex: difluoroethane, freon, I would say it is related to the "mass heat capacity " ie the amount of energy to be provided by heat exchange to raise the temperature of one unit of the mass of a substance by one kelvin in...

I don't know this model, of an aero vintage 2 stroke sparky.. what is its size, it looks rather large according to the propeller 254x102. il you feel a good compression and the engine runs freely, yes he will start again. you can test the cam and point with a little battery an a light bulb, an...

Thanks for the answer Kadora, and congratulations for this engine. I'm actually gathering ideas for an electric generator to be driven by one of my steam engine, hence my question, as 3 phase engine looks promising for such use...

Thanks Minh-Thanh for the answer, I 've got it. It also has to do with the low rpm that diesel engines have. hi gégé, I don't want to break your priority, buddy ! go head actually I think I'm chickening out...

Looking at the plan of your diesel engine, I wonder why the ratio stroke/bore reaches 2, is it for simple geometric reason to get high compression ratio or a thermal explanation underlies this choice? I know that many very old diesel had also a similar ratio, and other early engine too ! I'm...

nice result, do this engine run efficiently as generator ? how do you transform the battery into a 3 phases source ?

Thanks for the answer, Chaffe, the loss in heat in a tiny engine makes sens for me, although I read somewhere in this very informative thead that the compression is adiabatic !

Hi Minh Thanh great achievement with your engine, thanks for the plan... as a good compression ignition engine may have volumetric ratio near 1:19 and above, how come we need to add ether to get combustion ? any clue ? I'm a novice in the theory of the diesel cycle may I add...

the corrosion looks very deep, not just a rusted haze on the surface, as we sometimes see after a wet winter. the rehabilitation will be difficult, and not necessarily "cost effective"... unless it is to prove that one can fight against the adversity and desolation caused by the hurricane, which...

very elegant boiler, brazing looks great. 3D PLA printed parts are great to make stamping or flaring dies for annealed copper.

"Tungsten point discs can be made quite readily by slicing TIG electrodes with a Dremel abrasive disc. " good to know that, thanks for the tip... i have failed to cut disks in 3 mm tungsten carbide tool bits ! silver contacts work well with small engine but don't last long.