Rob, I am so thrilled! I'd had a Yankee Bicycle and was thrilled by not only its transmission and brake (singular, since it was so efficient), but by its frame geometry and thoughtful tyre tread design which eliminated the need for mudguards. (I hope the bike's in a happy home now). Your thinkings and tinkering are so inspiring and motivating to me to explore things on my own. Thank you, and (inasmuch as possible) Happy New Year. 😃
love these videos! Takes me back to the days of "The Secret life of machines" and "Connections" only better, cause now we have 3d printers and the internet to share the files... 10 outta 10 :)
Thank you Robert for your many video contributions. I benefit greatly from the explanations. I am working on a transmission for a bike and you are super helpful with many concepts and ideas. Thank you and have a great new year 2025
Brilliant you've covered Di Pietro's air engine and now Cambiogear. Please get in touch Bob. The Cambiogear was brilliant, it was the material that caused a few failures. I tried contacting Royce but no luck , pity because Gates Carbon Drive were interested!!!! So if you want to make one for me I'll fund that
Great idea. Im guessing this could be also used on a wind generator instead of gears using centrifuge force like a mini bike clutch for slow and high speed
@TheSpeedGodz beat me to it.... not just low/high speed, but truly continuous over a large range of wind speeds. Perhaps even kicking in additional generators with sufficient torque being produced. Just spitballing ideas off the top of my head here....
I love your videos! Happy New Year! I think there's one major issue with this design, even though it's simple: irregular stretching on the belt could lead to premature failure. This is likely why you don't see any manufacturers designing it this way. To reduce stretching, you might want to consider using roller pegs instead. So the rollers make the belt stretch less. It still stretches, just a lot less.❤❤❤
I remember my little sister having a bike with a gearing system that was encased in a tube or something. My dad was a mechanic/engineer and had no problems but it looked complicated, perhaps it wasn't? "Stirmy-archer" "Stermy-archer" something like that
🎉 Happy New Year! 🎊⚡, Another thing , that could be added to this Device! ADD some overlapping leaves over the pins. To keep the copper on a smooth constant path around the wheel. Possibly a few strips of .010" {+/-},thick plastic shim stock. Cut in 1/2" strips (or what ever the height of the legs are) with short pieces on every other peg. With longer on the other set of other pegs. Say possibly 3/4" or 1" long , for the short strips then long strips. Possibly 2" to possibly 3" with each having a slight arch to them around 1/4" to 1/2", possibly 5/8" dip in the center over 1.5" With the long strips glued on at about 1/3 to 1/4 from the length from one end, with the short bits glued in center. With the long bits over lapping to one side if they are long enough, the short strips may not be required. , when expanded to the large diameter the short side still fitting to the best peg. And the long end fitting just past. Covering the short strip and the peg. It being springy from being rolled up to get the arch (banana shape) so it will make a round flat , smooth surface to wrap wire around possibly having a hole to stick the wire in to hold it as it is starting the roll! Maybe use 2-4 layers on that peg or two pegs having a groove to make a hole to hold the end of the wire being rolled up on it making the strip .060"-.080" just over 1/16" or between 1.5 and 2mm(1.5mm being 1/16") 3mm being 1/8,1/4": 6mm in cast some do not have an idea what a metric equivalent of 1/4 banana is 😂 or 🌝 🚀 🏁🇺🇲, measuring units! 😂 🎉HAPPY 🎉 VERY 🎊NEW YEAR 🎊
Forgive me for saying, but as brilliant as your design is, I believe it has too many points of weakness and counter-leverage to handle much load even if made from steel. A solution may be to double the outer discs, putting one on each side. It may get you a little further. Thanks for the great video as always.
@@ThinkingandTinkering Although I knew of your initial use case, I was referring to the future should you implement a similar design for a heavier load. However, after thinking about your use case reminder a bit, I had an idea that I thought I'd share: Perhaps if you double up the discs (like a spool), you could use a fishing reel to feed the winding wheel and take advantage of the line guide on the reel to get a very fast and even winding. I don't wind enough coils to try it out, but if this strikes you as useful, please feel free to use it.
I really like the idea of this mechanism for a coil winder, though it would also be nice for let's say a CVT for a turbine(water, air, ect.) to keep the spin speed of the generator at a relative constant speed to stay within tolerances of both turbine and generator. Though would it beat the differential that you added the gear to and created a CVT out of is another question? It would be hard to beat for that usage. Thanks for this explanation and video Robert. I had seen the tables before and they are baffling to watch when in use, a beautiful thing.
@@ThinkingandTinkering For a belt driven bike more so than a chain I'd think, but with a robust enough built parts yeah it would be brilliant. A freewheeling ratchet(like many bikes currently are would be a must though) is needed otherwise you would get a heck of a workout. Then again I guess that all depends on which end the variable size gear is on. But now that I think about it, a 3 gear system where the variable gear is the middle gear between 2 static gears would prove to be interesting and could be very feasible.
Wondering, if the pegs went out much further (increased diameter), would there be too much space between pegs? In that case, can we make a 2nd or 3rd or 4th peg that similarly slides outwards but into secondary, tertiary, quaternary tracks, to double, triple, quadruple the circumference yet retain reasonably small gaps between pegs?
Fantastic! I wonder if a drive to a centrifugal mechanism similarto the valve lift on a small engine could regulte the gearing size to a suitable torque/wind speed ratio?
Potentially interesting way to shed load on a wind turbine. I'm guessing that's already in the brilliant mind that thinks ahead of its owner Robert...😉 The new year of 2025 will bring you joy, peace of mind, and prosperity, that is my wish for you from Ireland. 💚
really neat idea. How would you actuate the "gear change" while riding such a bike? I think for a bicycle you'd probably have to have a mirrored setup with the moveable gears sandwiched by control gears on either side. Maybe a drag could be employed outside the rotation that expanded them (under pressure) to its widest diameter, then "let go" or something similar that shrinks it back down (or the other way round).
Very interesting design, the little round ones could be toothed, and only need to be half round and can maybe be made to swivel a little but so that it doesn't jump. If you make it out of metal you can use an actual bicycle chain. and have small cogs or half-cogs move outward to change the speed, a normal jockey could take up the slack.
The problem is that the string needs to slide on the pegs when changing the diameter. And if the capstan is loaded it will not be able to slide so you can not shift gear under load. In fact i think the load would have to be so low to be able to shift that there will be to little preload for the capstan to not slip when transmitting torque. On the bike systems with chains or belts this is solved be only changing the diameter of the segments when the segment is not in contact with the chain or the belt. So in a position where the drive belt/chain is not wrapped. That can not be done with a capstan because the string is wrapped all the way around the drum or in this case the drive pins.
I know it might sound a bit mad, but I'd be very tempted to make a bicycle drive from the 3D printed plastic. I used to use 3D printed gears in my machine prototypes, and they worked well.
2 วันที่ผ่านมา
You definitely can but do not expect any... mileage out of it. 😊 The modern drivetrains are, usually, very high grade steel or very fancy aluminium alloys (these don't get much mileage either). Even so, I go thru one chain and one cassette every year. The chainrings fairing better as one set every three or four years. All this and I barely ride near the 6000mi/year mark.
@ThinkingandTinkering I like trying to use an "inappropriate" material to test out potential solutions to problems and figuring ways to design and strengthen the materials I'm working with, like your previous use of superglue to help bond print layers for example.. 👍. It's all good engineering exercise and a lot of fun in itself. An attempt at a 3D printed bicycle vari-drive would be a lot of work, but a great laugh...! 😁
There was a bike sold in USA that had an automatic gearbox it was pedal power and 2000ish for year and had a centrifugal gear changer that also expanded in a similar way. I've no idea the name of brand
really clever, thanks for wonderful inspiration (at exactly the same time as you said "make it in metal" I was thinking it) Could it be made strong enough for a car or tractor? Happy new year!!
Wow a CVT bicycle drive whould be awesome Rob! I whould go for a belt instead of a chain, because it's a lot cleaner and also maintanence free offcourse. Cheers!
After all these years, there's no excuse for Robert Murray-Smith to continue putting out videos with such poor sound quality. His content is interesting, but the terrible sound quality is very distracting. And with the solution (a wireless mic) being easy and relatively inexpensive, he's really doing a disservice to his audience by not fixing this problem.
Very nice thank you mechanical parts it is printed very nicely
Glad you like it
Yeah, for sure, the metal printed version for a bike would be interesting. Thanks for sharing. ❤
OMG, coming along nicely is an understatement. Awesome …
Really cool, thanks for sharing.
Paul, USA!!!
Glad you enjoyed it
thankyou for the positive energy you bring to my life.......great vid....
cheers mate
I'm sorry Robert, but I'm afraid this is absolutely brilliant.
lol - nice one mate
Happy new year Robert.
Thanks for all your inspiration
may you have a merry christmas and a happy new year lots of love and enjoyment goes with you and keep up the good work . terry
Happy new year form Australia🇭🇲 😊. Sorry for your loss earlier this year, and thank you for talking about it. It was very helpful.
Love the coil winder love it better in three sizes one smaller one the larger size you had I'll buy one of each as soon as they are read !
cheers mate
Another great presentation. Thank you and happy holidays🎉😊
cheers mate and a happy new year to you too
✌️ Great work Rob! Thanks for sharing 🙏
cheers mate and glad you liked it
Rob, I am so thrilled! I'd had a Yankee Bicycle and was thrilled by not only its transmission and brake (singular, since it was so efficient), but by its frame geometry and thoughtful tyre tread design which eliminated the need for mudguards. (I hope the bike's in a happy home now). Your thinkings and tinkering are so inspiring and motivating to me to explore things on my own. Thank you, and (inasmuch as possible) Happy New Year. 😃
Would love to know the tread pattern, since I nearly crashed my scooter in a storm last night cause of all the water spraying in my eyes😢
cheers mate and a happy new year to you too
love these videos! Takes me back to the days of "The Secret life of machines" and "Connections" only better, cause now we have 3d printers and the internet to share the files... 10 outta 10 :)
wow - cheers mate
Thank you Robert for your many video contributions. I benefit greatly from the explanations. I am working on a transmission for a bike and you are super helpful with many concepts and ideas. Thank you and have a great new year 2025
Thanks Rob, very interesting mechanism
cheers mate
Brilliant you've covered Di Pietro's air engine and now Cambiogear. Please get in touch Bob. The Cambiogear was brilliant, it was the material that caused a few failures. I tried contacting Royce but no luck , pity because Gates Carbon Drive were interested!!!! So if you want to make one for me I'll fund that
cheers mate - i might make a drive but it will just be on here i won't take funding to do it
Thanks for sharing. Very interesting.
cheers mate
Great idea. Im guessing this could be also used on a wind generator instead of gears using centrifuge force like a mini bike clutch for slow and high speed
@TheSpeedGodz beat me to it.... not just low/high speed, but truly continuous over a large range of wind speeds. Perhaps even kicking in additional generators with sufficient torque being produced. Just spitballing ideas off the top of my head here....
nice! cheers mate
Very interesting video. Nice work mister
I like that mechanism, now to think where I could use it.
I am sure you will come up with something mate
The variabile bicycle drive Is indeed interesting, i'd like to see that
cheers mate
Nice exploration of a CVT even though it is a little bit too complex for a serpentine coil maker.
I love your videos! Happy New Year! I think there's one major issue with this design, even though it's simple: irregular stretching on the belt could lead to premature failure. This is likely why you don't see any manufacturers designing it this way. To reduce stretching, you might want to consider using roller pegs instead. So the rollers make the belt stretch less. It still stretches, just a lot less.❤❤❤
cheers mate
I like this. it makes me wonder what the best drive belt/chain would look like.
I wonder
I remember my little sister having a bike with a gearing system that was encased in a tube or something. My dad was a mechanic/engineer and had no problems but it looked complicated, perhaps it wasn't? "Stirmy-archer" "Stermy-archer" something like that
it was the go to 3 speed hub gear
🎉 Happy New Year! 🎊⚡, Another thing , that could be added to this Device! ADD some overlapping leaves over the pins. To keep the copper on a smooth constant path around the wheel. Possibly a few strips of
.010" {+/-},thick plastic shim stock. Cut in 1/2" strips (or what ever the height of the legs are) with short pieces on every other peg. With longer on the other set of other pegs. Say possibly 3/4" or 1" long , for the short strips then long strips. Possibly 2" to possibly 3" with each having a slight arch to them around 1/4" to 1/2", possibly 5/8" dip in the center over 1.5"
With the long strips glued on at about 1/3 to 1/4 from the length from one end, with the short bits glued in center. With the long bits over lapping to one side if they are long enough, the short strips may not be required. , when expanded to the large diameter the short side still fitting to the best peg. And the long end fitting just past. Covering the short strip and the peg. It being springy from being rolled up to get the arch (banana shape) so it will make a round flat , smooth surface to wrap wire around possibly having a hole to stick the wire in to hold it as it is starting the roll! Maybe use
2-4 layers on that peg or two pegs having a groove to make a hole to hold the end of the wire being rolled up on it making the strip
.060"-.080" just over 1/16" or between 1.5 and 2mm(1.5mm being 1/16") 3mm being 1/8,1/4": 6mm in cast some do not have an idea what a metric equivalent of 1/4 banana is 😂 or 🌝 🚀 🏁🇺🇲, measuring units! 😂 🎉HAPPY 🎉 VERY 🎊NEW YEAR 🎊
That's smart work.
cheers mate
Nice one, thanks!
Glad you liked it!
Fantastic 👍🏽
Thank you! Cheers!
Forgive me for saying, but as brilliant as your design is, I believe it has too many points of weakness and counter-leverage to handle much load even if made from steel.
A solution may be to double the outer discs, putting one on each side. It may get you a little further.
Thanks for the great video as always.
I think you are right mate - disk either side for a drive - this is for winding coils rememeber
@@ThinkingandTinkering Although I knew of your initial use case, I was referring to the future should you implement a similar design for a heavier load.
However, after thinking about your use case reminder a bit, I had an idea that I thought I'd share:
Perhaps if you double up the discs (like a spool), you could use a fishing reel to feed the winding wheel and take advantage of the line guide on the reel to get a very fast and even winding.
I don't wind enough coils to try it out, but if this strikes you as useful, please feel free to use it.
Very nice and a great idea, 👍
glad you liked it mate
I really like the idea of this mechanism for a coil winder, though it would also be nice for let's say a CVT for a turbine(water, air, ect.) to keep the spin speed of the generator at a relative constant speed to stay within tolerances of both turbine and generator. Though would it beat the differential that you added the gear to and created a CVT out of is another question? It would be hard to beat for that usage. Thanks for this explanation and video Robert. I had seen the tables before and they are baffling to watch when in use, a beautiful thing.
i do like the idea of turning it into a drive for a bicycle
@@ThinkingandTinkering For a belt driven bike more so than a chain I'd think, but with a robust enough built parts yeah it would be brilliant. A freewheeling ratchet(like many bikes currently are would be a must though) is needed otherwise you would get a heck of a workout. Then again I guess that all depends on which end the variable size gear is on. But now that I think about it, a 3 gear system where the variable gear is the middle gear between 2 static gears would prove to be interesting and could be very feasible.
Wondering, if the pegs went out much further (increased diameter), would there be too much space between pegs? In that case, can we make a 2nd or 3rd or 4th peg that similarly slides outwards but into secondary, tertiary, quaternary tracks, to double, triple, quadruple the circumference yet retain reasonably small gaps between pegs?
good idea mate
Could you expand the pega like you expand the pulley? Or would that be too fragile?
Fantastic! I wonder if a drive to a centrifugal mechanism similarto the valve lift on a small engine could regulte the gearing size to a suitable torque/wind speed ratio?
Great point!
Potentially interesting way to shed load on a wind turbine. I'm guessing that's already in the brilliant mind that thinks ahead of its owner Robert...😉
The new year of 2025 will bring you joy, peace of mind, and prosperity, that is my wish for you from Ireland.
💚
nice thinking mate - and a happy new year to you too
That gizmo would be ideal for a belt drive… and that swirly bit makes me think of something strangely perpetual
I agree mate
really neat idea. How would you actuate the "gear change" while riding such a bike?
I think for a bicycle you'd probably have to have a mirrored setup with the moveable gears sandwiched by control gears on either side. Maybe a drag could be employed outside the rotation that expanded them (under pressure) to its widest diameter, then "let go" or something similar that shrinks it back down (or the other way round).
Very interesting design, the little round ones could be toothed, and only need to be half round and can maybe be made to swivel a little but so that it doesn't jump. If you make it out of metal you can use an actual bicycle chain. and have small cogs or half-cogs move outward to change the speed, a normal jockey could take up the slack.
good thinking mate
nice for a boat Winch
good point mate
Inspiring
RE that expensive table: how embarrassing for me when I put down my beer and find suddenly i have a wet foot and nothing to drink.
lol
The problem is that the string needs to slide on the pegs when changing the diameter. And if the capstan is loaded it will not be able to slide so you can not shift gear under load. In fact i think the load would have to be so low to be able to shift that there will be to little preload for the capstan to not slip when transmitting torque.
On the bike systems with chains or belts this is solved be only changing the diameter of the segments when the segment is not in contact with the chain or the belt. So in a position where the drive belt/chain is not wrapped. That can not be done with a capstan because the string is wrapped all the way around the drum or in this case the drive pins.
sorry mate - that's not right
I know it might sound a bit mad, but I'd be very tempted to make a bicycle drive from the 3D printed plastic. I used to use 3D printed gears in my machine prototypes, and they worked well.
You definitely can but do not expect any... mileage out of it. 😊
The modern drivetrains are, usually, very high grade steel or very fancy aluminium alloys (these don't get much mileage either). Even so, I go thru one chain and one cassette every year. The chainrings fairing better as one set every three or four years.
All this and I barely ride near the 6000mi/year mark.
I meant for prototyping, proof of concept, before spending money on expensive machining services... 😋
@saiello2061 3d printing for rapid prototyping is just common sense, not a bit mad or at all ;)
I don't think that is mad at all mate - i think that is exactly the way to go
@ThinkingandTinkering I like trying to use an "inappropriate" material to test out potential solutions to problems and figuring ways to design and strengthen the materials I'm working with, like your previous use of superglue to help bond print layers for example.. 👍. It's all good engineering exercise and a lot of fun in itself. An attempt at a 3D printed bicycle vari-drive would be a lot of work, but a great laugh...! 😁
There was a bike sold in USA that had an automatic gearbox it was pedal power and 2000ish for year and had a centrifugal gear changer that also expanded in a similar way. I've no idea the name of brand
this was the one
you could create a very similar action using racks and pinions similar to the lock pins on a bank vault door
for sure mate
Another great school day. Smaller capacity motorbike are either geared for off-road or road. Not anymore.
cheers mate
A bicycle transmission like that came out in the 70s.
there have been a few mate
really clever, thanks for wonderful inspiration (at exactly the same time as you said "make it in metal" I was thinking it) Could it be made strong enough for a car or tractor? Happy new year!!
I would think so
Wow a CVT bicycle drive whould be awesome Rob!
I whould go for a belt instead of a chain, because it's a lot cleaner and also maintanence free offcourse.
Cheers!
i agree mate a belt is a good option
Ummm... A variable diameter horizontal wind turbine perhaps.
What book is that?
Hiscox mechanical movements
❤❤❤❤❤❤❤❤❤❤❤
cheers mate
snazzy!
cheers mate
👍💪✌
cheers mate
😊
cheers mate
After all these years, there's no excuse for Robert Murray-Smith to continue putting out videos with such poor sound quality. His content is interesting, but the terrible sound quality is very distracting. And with the solution (a wireless mic) being easy and relatively inexpensive, he's really doing a disservice to his audience by not fixing this problem.
2nd!!🎉
awesome