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Hi, Can anyone tell me if Colphos 90 is suitable for silver brazing at home please. I only ever braze brass for model engineering and was considering Colphos 90 for the build of the cylinder of Rudy Kouhoupt's not so simple Oscillating engine. Regards, A.G

HI, A broken, old hacksaw blade makes a good flat spring, I made one for my webster engine from a worn out blade but first I had to polish it to a shine and then soften it by heat, once the shape was formed the metal was heated and cooled to retain the spring. If you are doing small stuff ...

Hi, Congratulations and well done, it seems to run well. I would just give you a word of caution, I would not operate the engine without a propeller for long period of time, you may need the cooling effect of the air circulating around the cylinder if you are going to let it run. Regards...

Hi, Your best bet is to use a finger type test indicator with a pivoting mount. I have a selection of the more modern ones such as Tesa and a couple of chinese ones with the dovetail mounting, these could be used if the mounting could be done on the top dovetail and then the mounting spigot is...

Hi, I built this engine last year, I think that it was my second engine. As I recall I indicated the part while upright and then drill 2/3 of way down by using the lever on my X1 mill, I used a lot of lubricant, WD40, and frequently withdrew the drill to remove the swarf that will inevitably...

Hi, Has anyone here built the Rudy Kouhoupt's not so simple oscillating engine? If so is there a build log for this? Many thanks and regards, A.G

Hi Zimma, Just to add to my previuos post, the glow plug does not cease functioning after the ignition starts, depending on the design, the miniature filament would still assist ignition , hence glow plug. This is apparently mostly achieved by a ctalytic process between the plug and the fuel...

Hi IronHorse, Thanks for the info, the only stuff that I can get at moment are some graphite rods that are used for stirring liquid metal in jewllery making or some graphite impregnared PTFE, 15% I believe. I dont know if these are at all suitable. Regards, A.G

Hi, As explained by the other gentleman, the ignition is achieved by compression, once a gas is compressed the temp goes up untill it reahces a critical point where combustion takes place, but this is not all, for this class of compression engines the fuel required has to have an accelerator...

Hi, I have a Myford Ml7, a Sieg C1, Taig and a Sherline. The Myford as described by the other gentleman is a one piece structure where the ways are integral with the footing. All the others are based a dovetail system for the ways with varying dovetail angles, 55.5 for Sherline, 45 for the...

Hi, I would say that Jan Ridder's plans are very well drawn and thought out and quite easy to follow. The screws are metric but you shold have no problem using the equivalent or close unc stuff, the rest are easily converted to imperial. Regards, A.G

Hi, If it is a Viton O ring then you are safe to about 250 C , some use ptfe and others, cast iron. Regards, A.G

Have you looked at Elmer's no52 engine? It is a vertical twin wobbler and I think it is double acting so there should a bit of power there too. The plans are available from the usual source for free, I think. Regards, A.G

Hi, That is exactly what I trying to find out. At that temp and pressure the steam is fairly dry, I think that you'd be safe with CI for cylinder. Regards, A.G

Hi, It should be obvious, how else you find a load of metal, put it together and it comes alive. that's why I make engines. Regards, A.G

Hi, I beleive that if you were to stay with cast iron, a grey cast iron would be suitable as these are the easiest to machine and are the mostly available of the lot from model engineering suppliers, at least here in the UK. The mostly available grade is GR17 British Standard or grade 250 to...

Hi, I build mine out of CI as sugggested by Jan in his original plans. He may have revised his plans and suggested new materials. The choice of cast iron was beacause of : A: CI retains heat almost better than any other material, this is necessary for the smooth operation of the vaccum...

Hi, Hope you get sorted out. Let us know how you get along please. Regards, A.G

Hi, The head stock spindle has to be removed first before the gears could be replaced. If you visit Arc Euro Trade site and find the article for changing the head stock bearings on their Sieg C3, same as the Conquest, you'd then know what to do. The reason for the juddering though is another...