Making an Automatic Two-speed Go kart Transmission 

I don't think people realize the sheer amount of technical knowledge that goes into designing and machining these parts you make. Plus you do it on DIY machines in your shed! Great work man, keep it up!

JohnnyQ90! On youtube is who you're referring to with the RC car transmission!

i love how the ending was done in a "This old tony" style. by talking with his hands over a workbench.

I like that he didn't explain it as he was working on it it gave the chance to try and figure out how it worked then he explained it fore anyone that didn't understand it

I think you will need something to absorb the shock when 2nd Gear engages. Maybe a v-belt between engine and transmission or the shock absorber from a small car clutch ( the inner section of the clutch disk with 4 radial coil springs) or a combination of both, just to give the engine at least a fraction of a second to slow down. otherwise something will break...

Watching the milling an fab is so calming with the music. If it was on tv it would be backed with death metal.

Kudos to your artistic director. You had a "Make it Extreme" vibe going on in this one; minus the heavy metal music. Very nice.

As a machinist and small engine enthusiast, this is one of my favorite channels

This is fantastic! Essentially made a centrifugal clutch for gears! It’s going to be fun figuring out the correct spring ratio and finding out how much torque the one way bearings can handle. Should be quite a bit if I remember how they work.

Its impressive that homemade lathe can be so accurate over a long distance like that shaft.

Love the music selection. The combination of fabrication with the music is calming.

You could also use a centrifugal clutch for second gear, which would be easier to build and tune 😉

WOW!!! That's awesome!! I'm thrilled that there is now a second two-speed transmission video out!!!

The music choice was something else and interesting, I like it a lot.

I was looking at using similar one way bearings on a kart but the torque limit on them is basically nothing. I'm very interested to see how these hold up! Also on most centrifugal sprag two speed gear setups have the sprag/dog mechanism on the driven shaft(in this case the axle) and not the driver shaft. If you have problems with it shifting into second and right back, or not staying in second properly then you might want to consider this. RC two speeds have that setup where the sprag/dog is on the spur gear (driven side) and not the pinion gear (driver side)

its about time some one builds something thats been in the rc world for years cant wait to see it used on one of your builds

Basically how a Tmaxx transmission works. Well RC car transmissions in general. Pretty sweet man!

The feeler gauge springs is genius!

Bloody Brilliant Rather B! I can see your next step right now! At the moment you have to pull the whole shebang apart to "toon" it. If you were to make your spring heavier, and include a very short coil spring under the head of it's holding down screw, you could "toon" it through a hole in it's sprocket boss. you may need two screws and holes, or some other method of keeping the spring captive, so it doesn't rotate.

A similar transmission design was used in the king midget cars. You may want to add a second locking pawl to your high gear as that first one may be too weak on its own (under load at peak torque it may fail). Another way to make this transmission is with 2 centrifugal clutches (2 separate engagement rpms ex. 1600 rpm for low speed 2500rpm for high speed) a 1 one way clutch sprocket (low speed the one way clutch prevents burning the low speed centrifugal clutch shoes when in high gear) and a fixed high speed sprocket

finally, someone who understands the movement in music. Calming, yet inspiring!

I’m a machinist. This is certifiable nice work. You did a lot of thinking ahead building that pawl. I like your solution to match drilling the hinge pin too. Grinding a clearance notch so you can drill the hole using the pawl as a drill fixture. So what else, you say? I say I like it.

that was a super satisfying video to watch and the way you explained every thing was easy to under stand. well done.

I remember when you built the manual and I was blown away, thought it was ingenious. Now homeboy's like that was so old, watch this.

This was a brilliant video, thank you so much. I thoroughly enjoyed the fact that I didn't have a clue what you were doing until the end!

I really dug the music. It gave your video almost an epic film quality. Quite an interesting design. Can't wait to see what you put it on!

This is called Intellectual Horsepower.

Somebody get this man a brass hammer lol. Using a claw hammer in the shop is never the right option, unless you're fixing the roof or something

Don't know to be more impressed with the fab skills or the video filming/editing process. Very well done.

Just glanced at the thumbnail and thought it was a This Old Tony vid, clicked on it thinking "This sounds like something rather b welding is going to be interested in". Pleasantly surprised, nice work man.

your videos are getting towards this old tony spec with that amount of machining bud. love your work.

Very nice video. I really like the different style and especially the chill music. Thanks !

Just adding in my own compliments on the 2 speed, and definitely for the editing and music on this one. I came for the new 2 speed, and stayed for every second of the beautiful video. Very well done sir!

Great stuff man. You’ve always been a little ahead of the guys doing similar stuff with your lathe work. Your machining skills shine in stuff like this 👍🏼

WOW, a lot of engineering went into that! Way back in the 60's, Rupp had a 2 speed automatic "transmission" on their TT500 mini bike. Theirs had a standard centrifugal clutch on the engine that had dual #35 chain sprockets on it. A pair of chains went to a jackshaft, one to a one way with a large sprocket (low gear) and the 2nd went to another centrifugal clutch with a smaller sprocket on it which was 2nd gear. There was only one main chain to the rear wheel. When the high gear clutch engaged the jackshaft sped up and the one way released. Whomever hires you will be lucky!!!

Absolutely genius design! Can't wait to see it on a machine

Brilliant!!! Can't wait to see it work!!!

Beautiful machine work...always great to watch the things you can do (that I never thought of) on your lathe and mill. Great design. Seems much better than using a second centrifugal clutch that's just going to slip until it finally locks on that we mortals without machinery to build such devices have to stick with. It was your two speed transmission that brought me to your channel in the first place...nice to see it come around again, new and improved!

I love the concept I just worry about the strength of it. For an rc car yes but a go cart with some real weight and torque behind it i can see some stuff sheering. Can't wait to see it in action. Awesome video.

Well done! That set up is Dope! You have upped your machinist skills. Your ready for another lathe.

The stuff you make amazes me man! So talented!

this is all well and good thank you for taking the time to figure it out. my thought is with this new setup you can't have reverse but with the old setup you have a 2 speed reverse

Awesome video! Thanks for showing us your hard work!

Just in the future, try and turn the ID and OD in the same setup so they will be parallel to each other. Anytime you remove part from the work holding you add misalignment, can never get totally true again with indicating in, might only be a few tenths but everything helps! Love the channel, keep up the good work!

Nice job Chris! Great video and build - I too agree, love the music!!! Got to say young man, I've been following for quite a few years now and everything you do just gets better!! Keep up the great work, solid props you are due! Big fan from Tropical Cleveland OH LOL 🤣

Damn dude, this is impressive craftsmanship! There are other gokart youtubers out there but you're a level up (or two) !

This is very cool. The design and machining are very impressive.

awesome! the easygoing music was nice with morning coffee as well.

Wow, Amazing and aspiring!! Thanks for the awesome content you provide!

This is awesome! Simular concept to centrifugal clutch.. Curious to see if it’s going to be a rough engagement. Keep em comin man!

Absolutely BRILLIANT!!!

Dude ! You stepped it up with this video. Your lathe skills are improving ! It made me start searching for a lathe of my own . Keep up the awesome work, and the videos ! Thanks

That thing is going to be sick

Great editing and machining!

I could watch content like this for hours, awesome job creating that. I just hope it doesn't fail right away, it seems that little hinge has a hell of a lot of forces acting on it, but what do I know lol

nice little system , especially if you want to combine both systems for both auto and manual gear selections . i can see applications for going to a awd or 4x4 as well. thanks for the videos

Dude I am loving this old Tony vibe going on. And I love the music

That's a really interesting idea for a go-kart transmission, I hope it works out. Excellent choice of music by the way, it really added something to the video.

Awesome engineering skills, and a super chilly video!!!

Love to see it work! Good concept..the only thing I think I would’ve done differently is have the 1st and 2nd gear sprockets bolt on to a flange on each assembly so you could interchange them for tune ability and also when the sprockets inevitably wear out.

GENIUS ! I really enjoy these milling videos, as boring as they may seem, the time lapse makes it look easy, would like to see a real time clock !

Just in case anyone was wondering, the channel he talks about at the end of the video that gave him inspiration for this transmission is JohnnyQ90

That is pretty cool engineering. I would add some sort of friction device on the second gear, so that it is already moving when it engages. If it bangs into gear too hard it's going to shorten the life of the ratchet mechanism greatly. Lots and lots of detailed work. Well done.

Was gonna say, just like an RC car gearbox. Good work!

this project right here is an example of your work you dare to build things that most people would never even think about building so the never go any further you do and for that i see you going farther than most if you don't have it you build it i see people that have huge shops with all the tools but they lack one thing a mind that knows how to think of the next better way and the passion to drive you to get it done i wouldn't change a thing you are doing i think truly you keep doing things you're way and i know you are right you will be the best and i see you doing that great job buddy you are going places

Workshop sound together with backgroud music is very nice

This is quality work! Now just imagine what the 16 people who disliked this video could do.

Great video. Loved the background music to go with the awesome machining. Just subscribed to your channel!

Amazing idea. I see a big company stealing this after redesign... Keep it going Chris! Your builds are next lvl and machine skills are out of this world!!!

Awesome! I can’t wait to see it on a project. Very cool 😎

Fine job, whatever the out come. Color me impressed.

ALWAYS love your tracks; this score was just as appropriate!!! ....then about 15 minutes in, you started losing me 🤣🤣🤣

I never saw one way bearings. In al my years I somehow missed them. Probably had them in my hands one or two times and never knew it...maybe..lol Great video!

Amazing work once again, well done.

Love this, awesome job!

I'm really eager to see this put to use on a go kart!

One of your best videos, you must have had that one on the backburner for while. I dig the classical piano.

This was awesome! Can't wait to see it on something.

Like the design. Very interesting editing style this week. Quite like it 👍

Lots of Automotive transmissions use a similar design to Lock Transmissions or to (Mechanically / Hydraulically ) lock a trans in a gear etc by using a Weight on the input shaft from the converter , The Centrifugal force overcomes the spring force and lets the valve shift (Hydraulically ) locking the trans or converter to make it straight drive .Removes that %3 or so of trans slip .

Good choice of music. That transmition seems pretty straight forward. As long as banging that latch pawl doesn't break something it should be pretty solid. If i were you, I'd use a belt drive or some kind of rubber damper on the input shaft to reduce some of the agressive forces that might happen when it shifts Geared ebike hub motors use the same one way bearings and I've heared that daily riders have them wear out in a year or 2 and they just stop gripping but you should be able to get some solid fun out of it before that happens.

Super creative, great vid.

Excited to see how this will work on a project, good stuff

Well that just sounds like a torque converter with extra steps... Kidding, love this!

Nice work.!!!! Thanks for sharing.

Love it!! Nice work!!

That will be cool to see in the testing phase!

I love the backround music😂❤️

I really liked the music. Very peaceful video.

Great video, machining + tunes 👍👍😁

Nice work. Love the music choise

Great music felt like I was watching a romantic movie 😂

Legend has it that he is the only man in the world able to make a straight cut with a hacksaw 😂

Gonna be cool to see on a cart...I'm excited

Excellent, really enjoyed the music.

Love the music, very soothing

Really great idea I see what you mean when you use a thicker filler gauge 2 gear will kick in at a higher rpm. I can’t wait to see it in action.Great video

I like the real time while your working the lathe!!

really enjoyed the build Chris 👍

Excellent work,love the content.