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And for the truly performance addicted there is Desmodromic valves. :-) ..Lew...

The two coils firing both cyls of a 2 cyl 4cycle engine has been used in regular autos, at least it was in my NSU Sport Prinz. It used regular points to break the primaries of the two coils (I believe they were in series) each coil wired to a plug. So one cyl was at the end of exhaust as the...

I've tried the "taper the front" of the cut-off tool many times and it still leaves a bit of the ring. I think it's about impossible to get it clean. The cutoff part starts to swing before it gets clear off and tears a bit with it. This has all been with aluminum, may be a bit better with steel...

The problem you'll run into very quick is, the magnet must be moving past the coil at a high speed. On Model engines the size reduction makes that, if not impossible almost so. Both size and, usually, slower RPM. IF youre model runs as fast as a chain saw will probably work just fine. :-)...

You can nearly always build small things on a big machine, the reverse is almost NEVER true. :-) ...lew...

OK :-) Here goes: CNC is just the beginning of the "slippery slope" to end of a lot of this hobby machining.. When the main effort toward producing a mechanical part is the "programming" of a computer to do the work, how long will it be till it's all done by the computer with voice input...

:-) Some things don't scale well and some (like material properties) don't scale at all. :-) ...lew...

And ZERO rake cutter. ...lew...

I think it's called "make work". The (?webmasters) or whatever they are called have to keep making changes to justify their positions. The same thing is happening to ALL the programs on your computer. :-( My browser, anti-virus, firewall etc programs take longer and longer to load every...

:-) TSAR (that sounds about right). Just like the soaring instructor taught me landing patterns TLAR (that looks about right). :-) ...lew...

I've been "playing" with this stuff for about 25 years and never saw one of those. ...lew...

Also note that all the fins in the world won't do "much" good without a good stream of air flowing over them. (as in an aircraft installation) :-) ...lew...

I can never remember these letter versions, but the step pulley heads are what I would prefer (over the "varydrive" ones) . We have 4 of them at school and I love them. I would have preferred a 3 phase with a VFD but the selection of pulley ratios and the high- low range works fairly fast once...

I agree whole heartedly; Lew, 80 year old nut!

So make your own. I made one for a 6" Southbend for the teacher ad it was fairly easy. I just sort of scaled down the one on the Clausing Metosas at school to about 2/3. ...lew...

Yep, I watched it. Some good detective work involved there. Simplest solution as to how it occurred: "A time traveler" :-) Just like old Leonardo. :-) ...lew...

Was just through several museums last week that several of those irons on display in suitable "environments" as well as the kind heated on a stove. That is what my mother used as I was growing up, the stove top type. We were not into the "latest" gimmicks. :-) ...lew...

How about a "sharp" edge on the bottom of the tube? That should provide less surface for the drop to adhere to.??? Just guessing. not a fluid dynamics engineer. :-) ...lew...

Looks like a milling attachment for a lathe. No the V way is on the wrong part for that. ...lew...

If it works for all Metric threads why not for ALL threads??? Diameter of the basic thread minus the pitch. ie in this case 9/32 - 1/40 inches. Works for all the Imperial threads I've checked. ...lew...