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Is thing still on? Tap... Tap... To make a long story short, I'm going to not say much, but it has been a rough year for me. It started with my cat having some issues that have had him on medication every day since last March, and going to the vet every few weeks. Then it was my turn for...

I have a completely untrained eye, so I see what looks like pits and areas where the metal doesn't appear smooth, and wonder if all that is usable? The oil cover looks better but also looks like rough metal in places (left end of its first picture, still in the petrobond).

If I may add to what @ddmckee54 is asking, you said you did several coats waiting for each to dry. Could you estimate the time to dry? That is more like one hour to two or more like 12 hours or more?

Don't forget that jewelers don't typically buy a pound of solder; they buy ounces or fractions of ounces. Especially small shops and hobbyists. These guys are one of the big name suppliers in the US. https://www.riogrande.com/product/silver-sheet-solder-assortment/101199GP/?code=101199...

This. If the poorly firing and properly firing cylinders reverse when the coils are swapped, you've found the issue.

It's a cool machine, with the three different sub turn tables to lap the rings. Clever design. For what it's worth, I've ground mirrors for telescopes and it's a similar machine but we tend to do one at a time. Depending on what you're doing, lenses or large mirrors the tools change shape.

Works fine for me - for whatever that's worth.

I bought Desk Proto 5 years ago and downloaded the free edition of version 7 a couple of months ago. I didn't see much worthwhile about it, but I freely admit that doesn't mean much. I don't have any 5-axis designs to play with.

Sorry to hear about the broken hip and other health problems. Hopefully, you'll feel well enough to get back to the machining. My wife has had both of her hips replaced and is getting close to the "worn out" point on one. OTOH, she was 49 when she had the first one done, so she has almost...

The previous experiences from @GreenTwin and @stevehuckss396 reminded me of this great quote from Arthur C. Clarke. Substitute "engineer" where it says scientist and then it goes along with what you guys say. “When a distinguished but elderly scientist states that something is possible...

FWIW, to me, these are better than a swinging needle. I'm assuming those squares or marks around the dial face aren't static but move as RPM and timing change.

That's what I used. Well, I just bought a couple of the parts of the set since I've had the lathe eight years and haven't needed one yet.

One of my problems was that McMaster offers several of Viton's formulas but they don't specify them by the letter/number designation that Viton uses. I wasn't sure I'd be getting the right ones.

Brian, A little searching shows these at Grainger. Hercules OEM only listed Viton ETP in their options that I found. Does this look right? The only advantage to Grainger is that they're less than six miles from me. OTOH, it's a BIG difference from 60 cents each to two for $14. Bob

Thanks. I have one piston with no rings (compressed air wobbler), one with two rings (Webster) and now this. Brian, I haven't actually done this part of it, yet. I wasn't going to cut the groove until I had the ring in my hands. Every other feature is machined already, the oval and...

This is hard to explain easily, but I've spent the last two weeks getting piston rings for this. Now I have a question for anyone bothering to keep up with this. Brian suggests somewhere that this is a Vyton piston ring. I searched for these at McMaster-Carr and a couple of sources I can't...

In addition to congratulating you for presenting a work of art, I want to thank you for the journey. I don't remember exactly when I first came across this build but have been following it for most of the time and have learned lots. To me, that's what it's all about. Bob

I may be in quite over my head here but I would expect the spark to be missed by a movie at seemingly random intervals, unless the camera shutter is somehow synchronized to the engine. Digital cameras make it more confusing to explain, but they still have an amount of time the shutter is open...

The number 1 and the C get pronounced as "once".

I rarely worked at frequencies that low as the input. I designed two receivers that would cover 16 MHz, both for commercial aircraft. Most of the time, I had handed the signals off to someone else by the time they were that slow. I find working in "engineering notation" helped me the most...