Ok guy, im a tinker and a woodenboat builder, I have always loved clocks and clock movement locomotion and this clock is incredible, I am taken by this, its pure genius simple.
Having looked at Brians video again i realised i have been down a similar path but i settled on the ball chain as a drive for my remontoire, i made a fly cutter to make a drive sprocket and adjusted the diameter to give a sweet running gear, its not easy and down to patience, maths only takes you so far, Dave
It's a very interesting mechanism, this remontoire. I had a go at drawing up a Wagner type one myself last month. It's up and running now. This continuous loop one looks interesting too.
+robbie77300 the problem with the loop system is that the drive mass increases as the weight drops (the chain gets longer as the weight drops, and its mass must be factored into the total drive weight). this isn't a problem if you're using a remontoire escapement, as brian does in the video, but any inertia-dependent escapement (anchor, galileo, etc) will see its long-term accuracy negatively affected. KEvron
Well it's a Wagner one I drew up and built. They also have a varying force generated by the dropping wheel, as it rotates around the 3rd wheel, applying less force above and below level with the 3rd wheel arbour. Obviously being direct to escape wheel, it's an even variation over time. But anyway, I don't think people building wood clocks are looking to use them for atomic level timing, but more the mechanical interest.
robbie77300 *"They also have a varying force generated by the dropping wheel"* this is true if you use a fixed weight, as brian does in this video, but you can instead suspend the weight over a radius. with a suspended weight, and a properly balanced rack, the power delivery won't vary. you can find video of the type i mean at mark frank's _my time machines_ website. i've also posted video of my own lego version: ( watch?v=6zRTAAsGiR4 ) KEvron
+KEvronista On the Wagner type I built last month, the change in drive is due to rotation of remontoire weight, part way around the 3rd wheel. The variation will be so similar each cycle, that other factors will vary the timing over the long term far more. If the weight variation is identical for each cycle, then the variation itself will have no real impact on accuracy. For example, the velocity of a pendulum varies from stopped, to full speed for every swing, so there is another variation in every pendulum period But once that variation is identical every time, accuracy is maintained.
traditionalists pooh-pooh the notion of combining a drive remontoire with a remontoire escapement. while it is redundant with regard to mitigating irregularities inherent to a drive train, it serves other purposes. for me, it makes the timing of complications easier to achieve; with a one-minute remontoire, my strike trigger setting could be off by 58 seconds, but the remontoire guarantees it'll still trigger at the top of the hour. KEvron
Not the focus of the video, but I LOVE your escapement. Only thing is I can't see how it impulses the pendulum, which is likely why you get perpetual motion comments. Could you describe?
Ah... OK, your other blog tipped me off. It's a novel gravity escapement. The key is the arm contacts the pendulum longer on the return swing than the initial position, hence impulsing it.
Is there any reason to having a remontoire on a clock with a gravity escapement like this, when the escapement already isolates the pendulum from the geartrain forces?
It places the source of power closer to the escapement, thereby increasing the accuracy by evening out variations in drive force caused by unevenness of the friction in the gear train.
Hello Brian, I see that you only have two weights in the first design, then after that there is only one weight. So, being petty and pedantic, these are not strictly Remontoires, right?
I like the idea of a remontoire. I have wondered for some time how the stop-start process of the escapement could be designed out of the gear train - momentarily moving from the effect of static to kinetic friction.
best I have acheived is 1minute in 12 hours, but I stop trying after a while as I move on to the next build. It gets increasingly more difficult to fine tune as otther factors come into play, temperature variations in the workshop in winter are all ovrr the place, plus some days I forget to wind or the pendulum gets bumped and stops.
Ok guy, im a tinker and a woodenboat builder, I have always loved clocks and clock movement locomotion and this clock is incredible, I am taken by this, its pure genius simple.
Many thanks Brian for making such a detailed video, thats a lot of work changing all the drive sprockets etc, cheers David
Having looked at Brians video again i realised i have been down a similar path but i settled on the ball chain as a drive for my remontoire, i made a fly cutter to make a drive sprocket and adjusted the diameter to give a sweet running gear, its not easy and down to patience, maths only takes you so far, Dave
It's a very interesting mechanism, this remontoire. I had a go at drawing up a Wagner type one myself last month. It's up and running now. This continuous loop one looks interesting too.
+robbie77300
the problem with the loop system is that the drive mass increases as the weight drops (the chain gets longer as the weight drops, and its mass must be factored into the total drive weight). this isn't a problem if you're using a remontoire escapement, as brian does in the video, but any inertia-dependent escapement (anchor, galileo, etc) will see its long-term accuracy negatively affected.
KEvron
Well it's a Wagner one I drew up and built. They also have a varying force generated by the dropping wheel, as it rotates around the 3rd wheel, applying less force above and below level with the 3rd wheel arbour. Obviously being direct to escape wheel, it's an even variation over time. But anyway, I don't think people building wood clocks are looking to use them for atomic level timing, but more the mechanical interest.
robbie77300
*"They also have a varying force generated by the dropping wheel"*
this is true if you use a fixed weight, as brian does in this video, but you can instead suspend the weight over a radius. with a suspended weight, and a properly balanced rack, the power delivery won't vary. you can find video of the type i mean at mark frank's _my time machines_ website. i've also posted video of my own lego version:
( watch?v=6zRTAAsGiR4 )
KEvron
+KEvronista On the Wagner type I built last month, the change in drive is due to rotation of remontoire weight, part way around the 3rd wheel. The variation will be so similar each cycle, that other factors will vary the timing over the long term far more. If the weight variation is identical for each cycle, then the variation itself will have no real impact on accuracy. For example, the velocity of a pendulum varies from stopped, to full speed for every swing, so there is another variation in every pendulum period But once that variation is identical every time, accuracy is maintained.
Are your wooden clocks for sale? Really interesting.
This would be a charming mechanism for a digital clock.
The gravity escapement looks very good, So is the The compound pendulum
What about using roller chain for the remontoire?
traditionalists pooh-pooh the notion of combining a drive remontoire with a remontoire escapement. while it is redundant with regard to mitigating irregularities inherent to a drive train, it serves other purposes. for me, it makes the timing of complications easier to achieve; with a one-minute remontoire, my strike trigger setting could be off by 58 seconds, but the remontoire guarantees it'll still trigger at the top of the hour.
KEvron
amazing! how long it last until it needs to be wound again?
Not the focus of the video, but I LOVE your escapement. Only thing is I can't see how it impulses the pendulum, which is likely why you get perpetual motion comments. Could you describe?
Ah... OK, your other blog tipped me off. It's a novel gravity escapement. The key is the arm contacts the pendulum longer on the return swing than the initial position, hence impulsing it.
Is there any reason to having a remontoire on a clock with a gravity escapement like this, when the escapement already isolates the pendulum from the geartrain forces?
It places the source of power closer to the escapement, thereby increasing the accuracy by evening out variations in drive force caused by unevenness of the friction in the gear train.
Muito bom, parabéns. Este relógio é perpétuo? ele funciona quanto tempo? precisa da corda?
hi brian.. thanks for video i need clock plan i tied to get fro your blog but i coudnt get how i can get can you help me?thanks
Hello Brian, I see that you only have two weights in the first design, then after that there is only one weight. So, being petty and pedantic, these are not strictly Remontoires, right?
Great! I think I'll try making it in Meccano! Hope you don't mind!
Is this mechanism perpetual? does it ever stop or need to be wound?
The clock needs to be wound.
I like the idea of a remontoire. I have wondered for some time how the stop-start process of the escapement could be designed out of the gear train - momentarily moving from the effect of static to kinetic friction.
The cheaper cogged belting is more flexible than the steel backed belt you used and would have sufficient strength.
Accuracy?
best I have acheived is 1minute in 12 hours, but I stop trying after a while as I move on to the next build. It gets increasingly more difficult to fine tune as otther factors come into play, temperature variations in the workshop in winter are all ovrr the place, plus some days I forget to wind or the pendulum gets bumped and stops.
@@woodenclocks Great stuff nonetheless. I saw a video of a homemade marble pendulum clock that claims to drift less than 1 second per day.
I'm about 3 layers too deep to understand what's going on right now
It could be very useful with a grasshopper escapement.
good video
amazing
creio que não. ele funciona ate acabar o a linha que segura o peso. observe.
Nice work!
this is Fking brilliant
Клас 😊❤
Neat.
Too loud.
Look at John Harrison 1730.