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Fashionable or not, you get what you pay for!

If it's Macor, I'm pretty sure it is, it can be machined with HSS, it does wear the tool but not so bad as to be unworkable. Here is machining information for Macor. Macor Machining Guide | Precision Ceramics USA

What's a phone book? ;)

Just to be pedantic, if you are halfway into the woods you are still entering, if you're halfway through, with your next step, you'll be exiting.

Here's a video of ring making, a bit different size but no heat treating!

Will this work for aluminum? Obviously a different etchant would be required, maybe sodium hydroxide?

With the 4130 you can flame harden the cam surfaces only, use an oxy-acetylene torch and the drill press, heat the surface quickly to red heat and quench in oil, that hardens the surface only as deep as the red heat goes, that way the shaft part will stay soft and can be straightened if required.

FWIW, I think you can patent pretty much anything, even something that has been patented before, the patent office is a commercial entity that has taken over keeping the record of the patents and, if it does a search, it's very cursory, the issue comes in defending the patent. Not to denigrate...

I considered a patent but after investigating it found that unless you have at least $1.5M to defend the patent, you're better off finding someone you can work with that has the money to produce your product and defend it or just produce the product with enough manufacturing capability that it...

In 7075 and 2½ diameters engagement you can likely get away with a 65% thread, yield and tensile strength are almost as high as 1018 steel.

Along those lines, there's an online calculator from Guhring at Tap Drill Calculator - GUHRING The formulae are; inch sizes tap drill size= nominal OD - (.0068 x %/ TPI) Metric tap drill size= nominal OD - (% x mm pitch/147.06) Even with the formula, it depends on the material being tapped so...

I was going to say that's interesting but who deals with pressures like that, but you can buy a 10,00 psi hydraulic pump for about $100 so there definitely is relevance to what we do.

It does depend on what the fastener is threading into and how many threads engagement. I worked for a company that made roll forming dies from D2 at Rc62 and the segments were bolted together with 3/8-16 socket head cap screws. They were having issues with breaking taps as they were drilling...

I have a nice set of Nicholson needle files, they've been used a few times but the ones I use regularly are a Chinese set. Both sets are about 20 years old but the Chinese set is sharper and just generally cuts better and more smoothly. I wasn't terribly impressed but then a Kennedy toolbox had...

As a general rule, the nominal diameter minus the pitch will work as the tap drill size for any 60 degree thread. It's not exact but very close to what the 'proper' calculations come up with. The nominal diameter of the #10 screw is (10 * .013) +.06 =0.19 -1/32=.159 tap drill, a 76% thread is...

When I first started machining in the 70s the foreman trained me to pour Babbitt bearings, that was the release agent there, too. The difference was that it was just put on with a very carburizing, little to no oxygen, oxy-acetylene flame.

You have to be careful mixing sets, some have different tooth pitch of the serrations/teeth.

A while ago I printed a version of Elmer Verburg's Baldy engine, it's not double acting and it's not all printed but the Idea is there. The parts printed were the frame, crank counterweight and piston.

Wow, you've got a junk yard where you can go 'shopping', that sort of thing ended around here a while ago.

See, that's the way it works, buy a new one and you'll find the old one! I think, if it isn't, it should be one of Murphy's Laws.