Set up is a killer. I remember telling a customer that the final bill would be the same for any number of items between 1 and 10,000 because of set up and minimum material batch sizes to meet specs.

And to think they were also using slide rules to work out the math! I still have a nice Frederick Post one that was my Dad's but I haven't used a "slipstick" in so long I'd probably have to start over to learn how to use it! 🤔

If you peruse old magazines, 1905 and alike, you'll find they did pretty much everything we're doing today, thinking the same too, just with more hat and suit.

@@aserta And safety tie.

Look up differential hobbers if this intrigues you. Automatically generates the gear due to a differential gear train inserted between the index table gears and the feed gears. Prior to differential hobbers, you'd have to calculate the helix angle lead into the index gears. While this worked, you'd have to run the hobber in reverse in order to return to starting position alignment for a second pass.

Back then they had to use their minds instead of fingers tapping keys. A lot of that mental brain power has now been lost.

Quite often you can make the thing you need if you have a way of finding out the proper dimensions of it.

keith has a big enough audience that he can ask for parts in a video and someone will email him and say they have one.

That’s what I was thinking also!

@@paulstanley31 I have a Brown & Sharpe No 2 universal mill from around 1912 and it has a tapered bolt to index the table at O deg. Not a new invention.

Helical gears run extremely quietly. They may or may not last longer because of the way they mesh

Yep. They are a bit of a PITA to setup, even on a hobber designed for it.

Hello Paul. Me too, also in the uk.

Hello there from Oxford England 🏴󠁧󠁢󠁥󠁮󠁧󠁿

It’s the uk Keith Rucker Appreciation Society!!

No matter the machine, generating helical gears is a pain... At least for gear driven machines. I cut gears for a living and thankfully there are good apps for figuring out closest gears for differentials on hobbers. It takes a while to do the figuring longhand.

Was going to suggest the same thing!

45° is rather rare for a helical (at least in my made to order shop) . Usually we make anything from ~8° to 23°30', but we use hobbers.

Three million billzion ziillion people have comment on that . I'm sure he knows.

@@flat-earther Thank you. I went and looked at a couple of other YT videos of this setup in action. You are absolutely correct.

@@patrickcolahan7499 Hi Patrick, Perinne here, Keith deleted my comments and blocked me from commenting, doing to others what he wouldn't want done to him. On another note, sure & thank you, I'm glad we figured out how the gear cutting works.

In my early teenage years {early 1960s} I brought home many 1930s-vintage AM radios from the local town garbage dump {long before the safety nannies surrounded our "sanitary landfill" with high fences}. By swapping vacuum tubes between radios I eventually restored a few receivers to full function. Listening in the summer of 1965 to the Stones "Satisfaction" played by a local AM radio station at loud volume on a top-quality 12" electro-dynamic** loudspeaker was a game-changer for me, & the beginning of my career in audio electronics & physics. How do kids today get their hands on equivalent antiquated tech to learn the basics by experimenting? KZfaq videos are a great resource, but hands on is often superior - you smell hot components, see wax dripping from failing paper capacitors, watch a thick rectifier tube filament start to glow dark red, experience the shock of touching a finger to ~350 volts DC {the back of my skull punched a dimple into the wallboard of my bedroom, a lesson I never forgot}, etc, etc. ** uses an electromagnet field coil that does double duty as the L of an LC filter for the high-voltage B+ rail

@@flat-earther Please take your nonsense elsewhere. What does this have to do with machine work?

Was wondering the same thing.

He would have seen the hole when he had the flashlight on it. You’ll have to go scold Messrs. Kearney and Trecker for not machining more tapered index holes into that big casting.

I'm not so sure about that. Back before CNC was in wide use, lots of machine shops would have routinely cut gears this way. The machinists would have known their machines from top to bottom, and would have been able to do these setups in their sleep. Just like blacksmiths knew how to work metal using skills largely lost today, the old-time machinists would have had no trouble knocking out the jobs in a timely manner on the machines they had grown up with. Todays technicians do the same but with modern machinery they can do it quicker and to finer tolerances, but it is still amazing to think what was achieved back in the day. For a real eye opener google the Antikythera Mechanism.

You either have 100 wrenches across all of your machines, or an adjustable at each alongside 1-2 common wrenches per machine. You don't want to not have redundant wrench sizes if using dedicated wrenches because it takes a lot of time to search for which machine had the ¾ inch wrench last.

Being close is enough for a functional gear. Being a degree off will slightly change the tooth flank geometry, but I doubt the original was a precision ground gear with tight tolerance.

Three million billion zillion people have made this comment since first he started on this project. I'm SURE he knows it.