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Does anyone have any data on the the breakdown voltage of any of the common DLP resins, or links to any data? I have spent several hours searching the internet for information, but all I have found is one special ceramic filled resin with a specification. And at a price of over $300+/500ml I am...

I use the inductive pickup tachometers for outboard motors and other small engines. There are a variety of then available on both E-Bay and Amazon starting at about US$12. Here is the one I have been using for several years. It is programable for 2 & 4 stroke engines so can be used for wasted...

Harry, Looks like yu are well underway, The 44w HRS will be just fine for the crank. Just a little bit more work in machining it. No problem with using some other alum for the connecting rod. II used 6061 on my first engines. The bi g end did get a bit sloppy, but not until I had 100 or more...

Harry, I think you will have a lot of fun building Tiny and am sure that it will be a runner. Being in Canada, are you going to build it to imperial dimensions as in Arv's plans or change over to metric dimensions to suit more available stock sizes? Don't be afraid of making changes to suit...

Harry, Welcome to the world of IC engines. With the smaller machine tools that you have I would go with the Tiny because there are many members on HMEM that have built them and can offer advice and mentoring if necessary. I think that most of the builds are variations of the original design by...

Congratulations, Brian. Glad you got it all sorted out.

Brian, Is there any possibility that your fuel has become accidentally contaminated. I fiddled and fussed for a couple of hours trying to get a known runner started before discovering that I had been using some of last seasons fuel. You might try running one of your known good runners with your...

A common cause of this is the mill head being out of tram. If you have a knee mill with a quill spindle you can make a quick and dirty check of this by indicating a feature with the quill retracted and moving the knee up make the measurement. Then lower the knee a couple of inches and extend...

I used it as a boring bar. I did not set it at an angle as the spiral of the side cutting edge generates the clearance needed behind the point. I did relieve the second side cutting edge so it would not rub the cut when the cut was deeper than half the pitch of the spiral. For the 1.5mm diameter...

I have done the same thing using 2 flute end mills down to 3/64 diameter to bore 1.5 mm diameter holes to a a depth of 2.5 mm. I am sure that the single flute end mill would give more chip clearance but it was not a problem for me. I did relieve the side cutting edge of the end mill before the...

This thread is now closed... Let us all get back to building toys. Gail in NM Admin

One possible problem with microswitchs is the number of operations before failure rating. Typical rating for high quality name brrand switches is 1 million operations. The best high rel switches are about 10 million operations and consumer grade import switches is often only a few hundred...

Brian, I made up some small plugs, 10-40 thread, a while back using pulltruded fiber glass - epoxy rod. According to the specs I was able to find it has slightly better insulating qualities than Corian. and as good heat tolerance as Acetal which is the base material of Corian. Very stiff and not...

Great ideas and methods Jason, Steamchick, Simon and others. Very nice constructions plans Simon. By sharing our ideas and methods novices builders can see that spark plugs are not really "spooky" and that as long as a few basic techniques such as spark gap, adequate electrical insulation and...

While my prefered material is leaded steel, I have seen brass used without problems by others, and as Minh Thanh said he has done it. Be sure to use a soft copper washer on the plug to make a good seal with the head. Your next material problem may be the insulator material. Most US A...

SIRJOHN, You mentioned cutting bevel gears in a previous post. Miter, bevel and skew bevel gears can be cut with the same standard involute cutters used for spur gears. They have a different tooth form than the commercial bevel gears that can only be cut by a generating process, but are just as...

John (comstock-friend), I like 1144 also and have used quite a bit of it as it machines well and has very little distortion from machining. Unfortunately I don't know of any common source of it under 1/4 inch diameter and the OP needs 3/16 diameter. If anyone knows of a source under 1/4 inch I...

Dave, I agree that stainless steel would be a better choice from an engineering standpoint. The thread started is having trouble machining the steels that he has tried so I suggest 12L14 to overcome his machining problems. I have used 12L14 for model steam locomotives and engines for many years...

I would suggest that you try 12L14 steel. It available from most any of the online metal vendors such as Online Metals or Speedy metals. 12L14 is very easy to machine. It's only disadvantage is that is is a little more prone to rust than some other alloys, but if you wipe or spray a little...

All of the 1940'S ETW engine designs that I am familiar with had fasteners that were far stronger than necessary. As ETW assisted David Braid with the 1950 design of the Seal Major I would suspect that the same is true with the Seal Major. I would not hesitate to use any flavor of steel that...