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Well, I got my "extra" hex block back in July, and finally got around to putting it in the mill: Now we'll see if I can keep track of what I'm doing when using it, or if I end up with a 10-sided hex!

The big advantage of spotting drills (in the “normal” sizes) is that they are available with 120 degree points - very close to 118 degrees - whereas center drills are 60 degrees.

My British plumber uses this terminology: compression fitting & ferrule:

And stick a note on the underside of the baseplate to remind yourself that there are double screws when you are working on it ten years from now.

Saw some great freebies on my morning walk, but couldn’t interest either wife or daughter:

@kwoodhands Found it: How to Machine a Square Hole in a Round Bushing

Joe Pie made a small square “collet” for one of his miniature machine builds. IIRC, he milled a rod to half-round, milled a 90 degree groove in the flat face, parted off two lengths then sandwiched the square stock between them in a 5C collet. I’ll try to find the video in the morning.

I haven’t had issues with my Bondhus allen wrenches (ball end keys & screwdriver style, all “Protanium”), not even the 0.050” one. The good news is they have a lifetime warranty, and I don’t think you need to return the bad one(s).

Not much choice; this is what came up for socket cap screws:

Got my copy from TEE last October; same price, but the postage was a little lower than now. Excellent experience (and a great book!).

Land of OZ - that explains why I couldn't find by searching on eBay. Thanks, but at $100AU I'll get a spare hex collet block and mill the corners off.

Item number no longer on eBay: could you post a link? Thank

Using distilled water in cooling systems always starts a debate. One side says it prevents hard water calcification. The other is that distilled water is “hungry” and can promote corrosion in systems with dissimilar metals [hungry water was discussed at length by The Tappet Brothers, Click &...

380/3/50 is common outside the US (460 x 50 / 60 = 383.3333etc). 460/3/60 motors will run, but 17% slower (which can be an issue with fan cooled motors).

The advantage of case hardening is that you get a long-wearing part with a tough interior. Hardened & tempered steel would be tough, but may wear faster. That said, in a model engine hardened & tempered would probably outlast the intended use.

As it is sterile (from a disease-free individual and as it leaves the body), legend says you can use it to clean wounds.

That's a deal: if it wasn't that 4" is just a little too big for my Mini-Mill, I'd get them!

Unfortunately out of stock, and $300+, but Clough42 was impressed by the quality of the matched pair of Shars 6” vises he bought and I would expect that the 4” would be similar: Little Machine Shop has some very good vises as well:

Welcome! If you could give us a little more background and your general location I’m sure there are members who can help.

Drop me a PM as it gets closer and we can set something up.