Recent content by peterl95124

here is the Don Bell "Master Cam Design" article, I find it hard to read because it tells you what to do but you then have to reverse-engineer what's going on, which is this, you start with the center points for the 3 arcs at exact scale, then ADD the same amount to each radius and you end up...

you've mis-identified the cam rotation point, see the "pointy" ended rods, those are "dead centers" for the cam blank which has to have been "center drilled". hopefully you remember "similar triangles" from elementary school geometry, if the master cam center is 4 times as far from the pivot as...

since I usually advance the grinding wheel by .001 to .002 per revolution of the cam it takes quite a few revolutions to grind a cam with .078 or .094 lift, which need to go slowly and evenly, so yes you'd much rather have a simple motor driving the revolutions, after all the time and effort for...

funny you should say that, I just ended my Duesenberg ring procrastination... am experimenting with yet another method of cold formed rings (my heat treat furnace element burned out and haven't found a replacement yet). my previous attempt at cold formed rings resulted in them needing to be...

there's no such thing as a "dumb question" !!! as you have by now noticed CBN is "cubic boron nitride", much longer lasting than alumina I use the method of Don Bell in "Master Cam Design" StrictlyIC Oct 1994. basically you start with a 3-arc cam design, keep the centers of the three arcs in...

first take a look at this video, then ask some questions, that way I'll know what parts need the most detailed drawings, FYI DoMore tool post grinder, 4" CBN wheel, variac for speed control, Sherline lathe bed, a micrometer head, ER-16 collet holder with long 1/2" straight shank, a couple XL...

I could probably be persuaded to clean up my plans enough that someone could use them my grinder was inspired by Bob Hettinger's (BAEM Club member), it is based on the tilting bed type (the cam shaft moves), not the type where the grinding wheel moves, and mine uses the additive master cam (see...

possibly my favorite of all the Stuarts !!! be very careful with the sole plate and don't make the mistake I made, be sure that the crankshaft bearing mounts are machined so that the cylinder will be centered in its mount at the other end, mine is off by a bit, not enough to be noticeable by...

looking good !!!, this is the point where I start grinding notches in the end of the cylinder liner and taking off some of the piston skirt, rather than weaken the con-rod, YMMV, ...

Green, NICE!, did you notice the axial cam for the ignition (I presume?) in between the radial cams for the valves, that's a neat trick !!! Pete.

the number one issue with low RPM in model engines is flywheel weight, the heavier the slower, as a certain minimum amount of flywheel inertia is required to get through the compression stroke. (also flywheel inertia doesn't scale linearly so smaller scale engines need larger than scale...

there was a fellow BAEM Club member that was going to turn my camshaft grinder drawings into something readable and/or usable by other people but that hasn't happened yet, and I can't say when I'd be able to get around to it, perhaps I can answer some questions ?

that's a good suggestion, but the ring gear should be between the crankshaft and the flywheel, and the flywheel bolts onto a large flange machined on the end of the crankshaft so no way to get the roller bearing in there (without designing a new crankshaft, argh!) that I can see

normally that would work but with the Duesey there's a ring gear that's cut directly into the flywheel. I guess I could make the ring gear separate, and if I wanted to be clever then use a one-way mechanism to engage it with the flywheel (like pawls and ratchet in a ten-speed hub, those tend to...

I didn't photo the machining of the flywheel/clutch housing, but here it is, mostly finished. basically it was a lot of rotary table work. now the engine has mounting lugs and I can start on a traditional oak wood box base to mount it on. It has a boss for a starter motor as per full size, but...