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Beautiful work mate, muuuuuch prettier than my first pinion! Look forward to watching this build :)

Some tips to make your next experience better: 1) it's called a tail stock on the lathe, it's called a footstock on the mill. This isn't about gatekeeping, knowing the proper terms makes finding spare parts easier 2) let the stock cool between your last roughing cut and the finish cut. Measure and adjust the DRO accordingly. Makes hitting the number easier. 3) use a four jaw independent chuck on your dividing head to dial in the part to tenths on the mill. 4) you don't have to go full depth in one pass on the gear cutter. Take two or three passes to reduce chatter, improve finish, and prolong cutter life. 5) look up the surface speed for the material you are cutting and the chip load per tooth for the cutter. Use those to calculate RPM and then feed rate. This also improves dimensional accurate, surface finish, and cutter life. And no hammering of death noises when cutting.

'I dog-eared the page. I've been here before.' Is an almost cinematicly beautiful point of discovery. There were people here before.... and it was us. They've left us a message. This'll make me smile for hours.

A long-term design point: using brass or bronze against iron/steel is a good choice because it prevents surface galling. The cost is that most of the wear happens on the gear made of the softer material. Typical practice is to spread that wear out across as many teeth as possible, so we usually make pinions of steel and use brass/bronze/plastic for the larger wheels. For the project you're doing now, it hardly matters. You might see the effects of wear on the brass gears if you use the toy every day for the next ten years. The idea becomes more important if you make gear trains that run continuously, or carry a lot of force, and is one of those bits of knowledge you pick up as you spend time working with gears.

I could watch Adam build anything and be entertained

The one day builds where Adam does something for the first time are the best one day builds imho

Hey Adam, I'm a phd student whose primary research area is on gear geometry and applications. I just wanted to say it was cool watching you learn a bit about the subject and make a couple of spur gears in this video!

I love the little bit of text at 25:38 saying “not blood”

Don’t leave us waiting too long! We want to see the whole build!

I always thought it would be neat to have "human-powered drag races" where people would make vehicles with flywheels or springs or super-capacitors/generators. Maybe 30 seconds to add energy from zero, and classes based on mechanical or electrical.

Expert gear engineer here, love your explanation of pressure angle etc. It is as complex as you explain actually. You should look into gear hobbing, which actually mills different teeth shapes (tooth counts) on gears, using the same tool. Nice video 👌

Y'know this description of gears at the start.. like you're right I don't need to know it, I'm immediately forgetting it, but the depth of human understanding and capability about any given subject always blows my mind. How far and how perfectly a person can understand something to keep making it better. Beautiful.

Welcome to my world! 40 years experience as a clockmaker. While clocks typically use a different type of gearing, the concept is essentially the same. I've cut hundreds of gears on a Bridgeport milling machine. Glad to see you enjoy a new experience.

Any chance you could do an interview or podcast with Clickspring? I'd love to hear the two of you talk about machining and precision.

Adam, this is fantastic and always wonderful to watch someone machine something complex like this. If you're curious about a full size "flywheel" car you might be interested in what Porsche (and to some extent Williams F1) did with a mounted flywheel. It was mag-lev and used magnetic induction to spin so as to reduce friction loss. Very cool tech on what it a very old idea.

Adam, thank you for showing people the skill needed to be an engineering machinist; in today's modern world of CinC tools, seeing someone having to work the way my grandfather, father and brother learnt to do their profession is satisfyingly interesting.

At 7:28 Adam mentions cutting gears and watching the ClickSpring KZfaq channel. Great and beautiful stuff there. Another very good machinist's channel is Keith Rucker's Vintage Machinery channel. He is a very good teacher.

This Old Tony has some excellent videos explaining gear cutting and gears in general as well.

Everything about this video was top notch. Perfect amount of intro story time, flair of goofy transitions, time lapse commentary. Everything!

I love the introduction of education here. I know nothing of this type of machining or even mathematics, but I love to learn. Keep those things coming Adam, even if your only have marginalized knowledge of them, because any experience helps people with none.

11:48 that was a pretty fantastic non-copyright-infringing flying mammalian superhero TV show transition!

Had this up on my big TV watching and my grandfather started watching with me as he worked at a machine shop for a long time, and he wanted me to mention something to you even though i know youll probably never see this.. XD He said "Please tell him that gloves or not, touching your part while spinning to check for smoothness is very dangerous. I know is common, hell i was even taught to do so in training! But its still not safe, you can still be pulled in. And that in case you are pulled in dont pull away from the part, push into it." He worked in the shop for 50 some odd years!

Nothing new yet from This Old Tony or Inheritance Machining... Adam puts out a machining video. 👌😙 chef's kiss

Old Volvos are amazing. My 940 had 440 000km in it when I changed it and some had even double to mine before it stopped working. One of the best cards I've ever had.

Gear cutting is a beautiful engineer. David Brown Gears and Citroën greatest gear manufacturers in the world at one point. Thank you your work and way you simplify engineering to get people interested. For small straight cut gears, making the cutyers from silver steel stock and dividing head . Well done

I feel like Adam would love This Old Tony's video on gear teeth as much as I did... goes into the whole involute and everything. ohh imagine a collab between Adam & This Old Tony!? that would be amazing... mainly because they are both amazing on their own surely thats a recipe for even more awesome sauce... right?

My working life was spent as an engineer. Working on large industrial gearboxes and gears manufactured for high end engine manufacturers in the UK, Europe and North and South America. I traveled all around solving problems with customers. Power train engineers do have their own "speak", which to most is a foreign language. I loved my job.

Whoever does the editing, I appreciate the Batman transition after 'to the lathe boy wonder' : )

There is something so beautiful about learning the language of a discipline. There are things that I have no idea how to even begin doing, but I can name them, so I can learn the things I need to know to learn the other things I need to know

Back when I was working as an engineer, part of my job was programming an Agie wire EDM and gears were often some of the parts we made on it. Wire EDM's are extraordinary machines and ideal for making gears. It could even make bevel gears. It was my favorite machine.

Made my first and only gear 30 yrs ago. I got to relive that experience today. Thank you!

I love the color of bronze and I love the strings it makes while cutting!

Hey Adam and the Tested crew... I don't know what is going on with youtube lately but none of your new vids have been recommended to me for months now. I am an avid watcher and see Adam and his "doings" as something of a mythical being that I inspire to be one day haha.... But it is upsetting knowing that youtube is not showing your videos to someone who would literally listen to your "theories on washing the dishes" (if that ever comes out haha.) Anyway, at least I have a 3 or 4 month backlog to binge on.... I just thought you should all know that your hard work and content is not being spread to the people who love you all and you should maybe as KZfaq why this travesty is happening. Thanks again for all of your great work. You are a huge inspiration.

I love Clickspring videos too and he makes it all look so easy!

Really looking forward to seeing the rest of this build!

i love when he pulls out some of the odd pieces of mythbuster stuff.

Gears are fascinating to me. The "Machinery's Handbook" is the bible for any machinist. For me gears were the next step after learning threads. My step-grandfather (Wilbur Harbold) created "Harbold Gearworks" in Belmont (in the Bay Area). As a kid, going to the shop was a special treat to get to see the machines. As a late teenager I remember going to the shop needing to replace the nylon gears that had stripped in my R/C car (Tamiya Rough Rider). I asked if he had time to make a set of replacement for me and he said "yes", I was so excited. While I was at the shop looking around (being amazed at the "Gleason" helical gear cutter machine and the process of making worm drive gears - some of which were used on old Pierce Arrow vehicles) I was presented with not just replacement gears for my R/C car but stress-proof stainless gear set with press fitted sealed ball bearings (the stock drivetrain in the R/C car used bronze bushings). They worked perfectly. Thanks so much for triggering the gear related memories...lol. Great video Adam :)...I guess the next step would be to learn how to machine a cam shaft...hehe Cheers, Jeff (Garage Maker Guy)

the editors need a raise! 25:37 "not blood" 25:41 "i think" you guys crack me up!

Adam goes full on "6 years old" at 8:48 "...I wan't it to go for like a BLOCK!" just cracked me up 🤣 ...man what a world this would be if everyone would hold on to that level of energy in their life.

This Old Tony has a great video explaining how to make gears from scratch

Love your work Adam, putting the fun back into machining. I have a machine shop full of CNC machines but you seem to be able to put the fun back into discovering new machining processes. 10/10

Always a pleasure to watch Adam work 🥹

Thanks Adam. I miss building stuff now that I've been stuck in a care center for the last four years plus. You Rock!

Random comment, but I really want to compliment the sound editing/design on these. Particularly when you're going in and out of fast motion, making sure you've got smooth audio that makes sense throughout suddenly strikes me as a problem that's not as easy to solve as you make it look.

Gotta say, I love watching as little of the videos cut out as possible because its so much fun just to see you acting like yourself while you do the projects that interest you!! I'll always watch as long as you're making the videos!!

The Machinery handbook brings back memories when I was at Ford tractors. We used get the SAE book set of specs. every couple of years. I was in inspection, I think gears were measured with rollers. Now retired. Nice shop setup.

Back when my "guys night out" was a machine-shop "class" at a local high-school, I just *LOVED* machining brass and bronze. Always pretty results, and as you observe, the swarf is just so very attractive as well. In fact, my very-first project on the lathe there was a pair of replacement bronze bushings for the power-head of our vacuum cleaner.

Machinery's handbook might just be my favorite book.

Its super satisfying watching Adam play with his adult Legos.

Adam, I try not to ask much of the channels I watch, but please don't let this be the last we see of this project. I wanna see the build and see this car go 200+ yards.

LOVE how you take the time to break things down and explain them-including your thinking aloud-which we all know is often so helpful. And the car-repair analogy was brilliant and spot on!

It would be amazing if you and Clickspring did a project together.

The time lapse when cutting the teeth was way more satisfying when watching the drill bits spinning from vibration in the background

I went through this exercise digitally, had a 3d printer project that had gears, and I'm the type of person who likes to understand the why and how, so i googled the machinists handbook, walked through the process of manually drawing the gears by hand, using all the complex geometry with all the overlapping and intercecting circles and tangents in CAD. It took me a couple days to truly understand what i was doing and be able to re create the process from memory instead of reading step by step. Now i just use the gear creator tool and it does it for me, but i understand what is going on!

25:37 "not blood" "I think..." love it!

An absolute JOY to watch! I don't know anything about machining and very little about gears. Thanks you so very much for showing every step along the way.

I love watching Adam, I really do, his makers enthusiasm is highly infectious. I watch nearly every episode, but, I live to get those brief glimpses we occasionally get of the Samaritan. There is something about that object that is both mesmerising and magical and I find it difficult to explain and understand why.

It's funny. I was just talking to a coworker yesterday about my love of gears and bearings, and how beautiful, crisp, and precise they are when they are new. Marveling at how they do it, then Adam put out this video today. I love it!

The section when you start cutting the teeth and it's sped up.. reminds me of the Bicentennial Man intro, love it.

A tip for you. when putting the tailstock center into the part, make it a point to have your handwheel handle over the back of the center. That way gravity will keep it snug, and it won't loosen up.

Adam running that stone over the mill triggered all my ASMR…. Lit up like a Christmas tree…

Truly a man of many talents! I grew up with Mythbusters and now nearly 20 years on, you still amaze me Adam.

Two thumbs up for diving in and doing this!

I'm proud of you Adam. Great work.

Fascinating. Thank you, Adam!

Your homily about the learning process on your Volvo resonated with me. My auto mechanic 'tutor' was an ancient Bedford van that had a three speed, column change gearbox and sliding doors. I swapped out engine block, cylinder head, crankshaft, clutch, gearbox and brake system complete, mostly from parts salvaged from the scrap yard. Happy days well before all the black box technology of modern vehicles. Thanks for an interesting video.

I was watching this and I realized just how far the internet and monitors have come. I am watching it on my big screen through my Nintendo Switch. He goes to shave a tiny amount off that brass, and I could see the bar being thinner. That would not be possible 10 years ago. I just thought it was amazing, considering what the internet was like when I was in highschool in the late 90's.

Manufacturing gears is something I've always wanted to be good at, and am still learning/experimenting. Using an actual gear cutter/hob is still on my bucket list, so it's nice to see my favorite engineer actually post a video about it. Awesome!!

To find the outside diameter of any standard non modified pitch diameter spur gear all you do is add 2 to the number of teeth in the gear and divide by the diametral pitch. This works for metric and circular pitch gears as well when you convert those pitches to diametral pitch. The result with be in inches.

Love the "not blood" Easter egg! It could very well be fake blood, though, from the knife episode.

"its almost like you could name it." i love this man.

I like this man. He is good people.

Paused the video and pulled out my own copy of Machinery's Handbook that I have never had reason to use before to figure out the measurements before Adam gave the answer. Took a while, but I got the correct diameter and learned a lot about gears along the way. D=(N+2)/P where N = number of teeth and P = Diametrical pitch. D=(10+2)/12=1

congratulations 🎉

Fascinating subject Adam... thank you for sharing this process!

All I want for Christmas is to see every single last detail, mistake, correction, paint, and test drive of this project!

9:35 Gandalf: I have no memory of this place.

There's something supremely satisfying about precision machined parts like that - they're like little works of art :)

Adam, I hope you see this. I wanted to say that I grew up on a steady diet of Mythbusters and I always anticipated new episodes and enjoyed reruns of it as you, Jamie, Tori, Kari, Grant (R.I.P), et al were doing such a great job of entertaining, educating, and fact checking. It warms my heart to see you're still creating content that enriches those who take the time to consume it and I look forward to seeing many more projects. (That Samaritan is SICK!) I hope you, the Missus, as well as Thing One and Thing Two have a wonderful holiday season and I wish you all the best. Thank you so much for so many years of smiles and insight and I look forward to many more! May you and yours be blessed in all you do!

Props to the editor for the "To the lathe, Boy Wonder" transition!

I would LOVE to see the rest of this project!

Adam being a lathe with chatter for 5 seconds: 26:30 Never change, Adam xD

Amazing video, Adam! Thanks!

"RPR Discount Volvo Parts, across from Hotsy Totsy on San Pablo" I didn't know I needed this sentence in my life until it was said. Even stripped from any context, it's just a wonderful sentence to be verbalized.

11:47 This transition gag had me dying, beautifully done.

I just want to thank Josh Self for the Batman lathe transition. It was 🤌

Mills and lathes are magical. I'd love to have a shop big enough to have both

Nice, I cut my first gear not too long ago. I recently acquired a 9" south bend lathe, but it didn't come with a thread dial. So, I thought I'd make one. I was actually easier than I thought. I thought cutting gears was way above my experience. A good friend of mine who is actually a real machinist told me "Don't be scared" it's easier than you think. Gave me a few pointers and off I went. I have a small bench top mill and a dividing attachment for a rotary table, very similar to your set up. It came out great and works perfectly. I was really proud of that little gear. Have a nice day!

I found it amusing when he started talking about pitch and pressure angles and had that split second facial expression where he realized he just went down a rabbit hole he now has to explain in more detail.

thank you for letting us in on the through process just great :)

Great video! As an Industrial Designer, I have been through this exact same experience creating plastic gears-don’t know the exact math, but I can guesstimate well enough. I always enjoy your style of creation. 👍

I find videos about gear cutting to be very engaging, but that's just my 'pinion.

Love watching your process how you do things, its just awesome to watch!! Keep up this awesome work you do!! Thank you very much for what you do!

Now I want to build one I really can't wait to see it finished

Wow! That gear looks so beautiful! Awesome work for a first time!

Hi Adam, I used to build a gearbox for a jigsaw myself as well. With a dividing head on the milling machine. I did the calculation for that too. In Germany we have a table book with all the formulas for calculation. A little tip. Harden the surface of the teeth, then they live longer.

Good luck with the project! @24:53 The "chatter" you are hearing is caused by a combination of factors, including the lack of lubrication, the high cutting speed (measured in in SFM, surface feet per minute), and the lack of rigidity caused by the excessive tool "stick out". You positioned the cutter right at the far end of the arbour, thereby maximising is distance from the spindle. As each tooth cuts, the rection force tries to flex the arbour and that sets up an oscillation which you can hear. You can then also see the wavy "chatter" marks on the finished gear. Hope that helps, and you can get smooth chatter-free cutting in future.

The real world of gear tooth geometry is unbelievably complicated. However complicated you might imagine it could possibly be, it's more complicated than that.

Thank You !!