They only do those "legitimate" things for tax write-off purposes.

Today I learned

Its not that obscure really. Its technically called broaching, and its a common use of a press, esp. in things like marine work with metal props that need to key onto shafts. There are other ways to do it, of course, but this is fairly simple and straightforward.

I've had to spec it a few times on parts and I do recall checking common broach sizes so the shop did not include custom tooling in their quotes, assuming that would be the machining method they chose.

@@mysock351C ;) we know

at least it has enough power :D

@@Beyondthepress That's true, the press is a bit overqualified maybe :-) But actually, I meant the rod used to push the broach through after it is fully pressed in. Most people just use a piece of straight rod or a punch and then try to catch it as it falls or fetch it from the floor. I liked yours having the proper shape to stay on top.

@@kraklakvakve pråfessional toool

@@arvidsalle2979 Tüül

Hats off to you buddy, learning a language is tedious task, keep it up.

@@hunterhunt9702 Hah, that it is. Languages definitely aren't my strong point, and Estonian/Finnish are a bugger to learn as an English speaker. Certainly gives me a newfound respect for how well Lauri and co. speak English, because I imagine it's just as bad the other way round!

@@GoogleAreDumb Of course it's hard, frustrated, it's got a start but no end, but absolutely rewarding man, you may find anther you right a cross the glob. :D

For a Finn hearing Estonian is bit like not being sure if you are having a stroke or not. Everything sounds familiar,, but doesn't make sense.

@@GoogleAreDumb English is so easy language to learn. Lauri is talking "rally english" for purpose. I bet he can talk much better.

Does the tool just compress the metal in the region that it cuts out, or does it actually remove material by shaving away a millimeter each time?

@@brianevans4 Yes, a millimeter each time (more or less) each tooth on the broach is slightly further forward (0.01mm) than the one before this, thus a string of these cutting edges adds up over time. The shims are usually 0.010" (0.25 mm), and get added to push the whole thing forward after each pass. In general, you can't compress metal, you can only cause it to flow if you exceed it's elastic limit, which can be 100,000 psi or more for steel. If you managed to do that with the keyway, you would simply distort the gear and make it unusable. Material removal is the only way to go.

Same! I wanna see the guts.

You have a tremendous channel name.

@@westherm Thank you Andrew

Maybe they are used on big turbine or ship main shafts?

I was wondering that too at first, but I think they have a little T-shaped shoulder at the top that they sit on

@@GaryVirta Oh, yep. You can see it right at the beginning where they're laying on the table.