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stick with proven metals (grey cast iron, 1144 steel, etc, I've even had good luck with 4130 when a thin wall was required), otherwise you're the guinea pig ! I once used brass pipe to make split crankshaft bearings because it was cheap and available at the local hardware store, had to throw...

BINGO!!!, me too, I also use a sharpie to write on the part to be machined what some of the dimensions are and double check before cutting, otherwise I tend to end up in the "measure once cut twice" club :) !!!

Teflon (your frying pan) also contains fluorine and if you leave it on the stove empty on HIGH will start fuming it in a short time, and many many other products contain it like Gortex (your jacket), and even non-stick pizza box lining paper. toxic is everywhere, the irony of "better living...

Very Cool :) !!! I've always wanted to model a snow cat ! but haven't liked any form of continuously-variable-differential that I've seen so far and I'm guessing yours isn't CV, if not what is it ?

Terry, (first putting on my asbestos flame suit :) ) am puzzled by the choice of CDI, neither D.K.Grimm nor anyone else has been able to come up with any compelling reason or evidence that it works better than LDI, either way you charge up a device (either capacitor or inductor) with a certain...

in 1992 the book "Strahlturbine fur flugmodelle I'm Selbstbau" by Kurt Schrekling came out, I absolutely HAD to build that engine, I didn't know a word of German, I didn't have any machine tools, but I simply HAD to. after a year or two of researching bench-top machine tools, reading text books...

https://www.homemodelenginemachinist.com/threads/lawrence-merlin-v12.34432/

Green, most of the folks that are really good have been at it so long they've simply forgotten that phase of their life, next to my Rolls Royce Merlin V-12 I have two shoe boxes overflowing with "wall parts" just from that one engine :) !!! yes, "first pop" is magical :-) !!! best, Pete.

don't know if Ken I is still reading his thread, I do have a couple questions, about the bearings, up front there's just the thrust bearing, are that thrust bearing's grooves deep enough that they keep the tool bit holder centered, IE there's no need for a radial bearing at both ends of the...

I like this thread, very informative, since my mini-lathe only has an MT-2 tailstock and all the commercially made rotary broaches seem to be MT-3 or 3/4" shank, am considering a re-scaling of this design for MT-2, probably a fools errand, but I'm also only hoping to make pretty small broaches...

From Machinery's Handbook, table of dimensions for National Unified Threads 10-TPI, pitch 0.100", depth of external thread Sharp Vee 0.0866, depth of external thread National Unified 0.06134 so the pitch is 0.1000", if your cross slide is at 30-deg and you feed in 0.075" on the cross slide...

cosine (30-deg) == 0.866, sine(30-deg) == 0.500, neither is 0.750, it is the sine or cosine that determines the depth of cut based on moving a compound slide at an angle. Also a 60-deg triangle has all equal sides, so the pitch of the thread and the depth along the direction of the...

I think the metric/scientific unit for that is the "OhNoSecond" (the time it takes between doing something and realizing "Oh No" I should not have done that) :) !!!

IMHO and experience, the only way to get smooth finish threads when single-point cutting on a lathe is to start with leaded-steel or leaded-brass, in my experience everything else leads to unacceptable crap (and either way 30-deg, 29.5-deg, and 29-deg doesn't seem to matter, I stick with 90-deg...

is it possible you have mis-understood the geometry of traditional threads ? changing the depth of cut alters the pitch-circle-diameter of the threads, if you don't go deep enough the work will not fit into a tapped hole, if you go too deep the work will be too loose in a tapped hole, and IIUC...

OMG, you're a genius, keep posting :-) !!! PS, over in UK there's hpcgears-dot-com that has steel internal ring gears for about 1/4 the price

not only are gyroscopes engines, but so are mechanical clocks, so are cam grinders, so are drill and mill sharpeners, so are gear cutters and gear hobbers, so are EDMs, so are home built CNCs, etc, etc, etc, enjoy :-) !!!

in my mind the beryllium question comes down to this, are aviation gyro rotors made from C172 Beryllium Copper or from a more common brass alloy. my back of the envelope calculations say that for the dimensions of my rotor if it is C280 (60/40 brass) then its yield strength max RPM is around...

you can send it to me any time :-) !!!

please take a look at the pictures of my gyroscope, please take a look at the pictures of the "gyroscope sphere" please note that these have nothing in common physically, and that the sphere didn't arrive until the cold war long after my gyroscope, and that they were used for ICBM inertial...