Search results

Terry, Thanks for your comments and details on the Trimble ring making procedure. I have carefully built the same ring cleaver that you use and I consider the ring breaks created as very straight radial breaks, but only at the surfaces contacted by the knife points. Between the knife contact...

My apology for any copyright infringement of the spreadsheet screen capture posted here. I was not aware of the origin of the spreadsheet when I downloaded it. That is definitely is an SIC issue I need. Thank you for the mention. Jeff

I have an Excel Trimble ring design spreadsheet that I found somewhere in the forums that agrees with what Petertha has shown. However, in it all three curves intersect forming a closed triangle. In this spreadsheet altering either the thickness or the wall pressure changes the dowel and mandrel...

John, The intake valve could very likely be the problem, or not. It could be the exhaust valve, the piston ring side clearance, or the roundness and fit of the rings in the cylinder. The fit quality on the valve guide you mentioned could extend to any, or all of the above possibilities. The...

Rod, I have a plan book if you need one. Jeff

Mark, It has been a long while since you have posted any updates on your Snow build. I sure hope you haven't forgotten about it. Jeff

I have always thought aluminum alloys and zinc to be very reactive to strong acids and would think any concentrations of nitric, hydrocloric, and sulfuric acids would attack not only the ferrous tap but also the inside surface of the hole. I have personally used alum with good success but I...

The S/S 3mm carb is a small carb good for most any .75" to 1.125" bore slow to medium speed <5000 RPM model engine. They will work with Coleman fuel, gasoline, or even propane (with a demand regulator). It is a self compensating type carb good for variable or fixed speed. It is about the...

Charlie, I often use an old electric hotplate to add heat to a larger silver brazing job. It works well enough to braze with propane. Jeff

rweber, No plans. Just a few sketches for some particular items. A lot of experimenting went on during the build. You might want to look at another current thread regarding generator building. Jeff http://www.homemodelenginemachinist.com/showthread.php?p=303485#post303485

Rudy, Regarding the generator housings, you first start with a stator and winding. That is the most important part. Once I had selected the stator and winding, the housing was then fabricated around it. In the case of the dynamo I used slices of heavy wall aluminum tubing screwed together...

Rudy, The alternators you show above are somewhat later era AC alternators than I thought you were looking to model. I have built this type of model alternator using a ceiling fan motor stator and a PM rotor. I know you don't want to use magnets, but there is no other way to feasibly excite a...

Rudy, For small dynamo's the PM Research dynamo kit is ideally sized for the Stuart 10 engines. It is permanent magnet design which causes some cogging, but the rotor magnetic attracting and repulsing action known as cogging cancels out. It does not add any drag to the engine without electrical...

John, In my mind, a fresh water cooling jacket should be more on the generous side rather than the thin side. Thin jackets will foul more quickly if the water clarity is poor. An intake water strainer might also be advisable. Set up your engine running at the design load and RPM with a...

TonyM Thanks. The video link should work now. Jeff

The Nash Gas Engine Electric Plant I recently completed a 1/8th scale model of a 25 hp 2 cylinder Nash gas engine electric plant. Nash engines were produced by the National Meter Co. of NYC and were designed by their head engineer Lewis H. Nash. The engine design era was the late 1890’s...

gman My PM1127VF-LB lathe has a 90vdc brush type motor. The brake feature on my KB Electronics speed control works very well. I purchased it from www.galco.com. However, you would need a much different speed control since the newer lathes use brushless type motors. Jeff

Mike, I used the distributor sold by Roy Sholl at S/S. The cap is 1" OD. The length of the current cap and base available from Roy is slightly longer so I cannot give you an OAL dimension. The real B-M engines did not use a distributor ignition system. They used two small magnetos, one on each...

Mike, I sent you a PM. Jeff

Mike, The print is correct. Note that on the upper left portion of page 38 the cylinder head assembly drawing item #19 shows four views. The center right hand view is labeled the bottom view of the head. The center left hand view is actually the top view of the head. Keep in mind you have to...