Recent Posts

Pages: [1] 2 3 ... 10
1
In addition to my previous post, the following Ken Kuo animation should also be of interest and value:

Unilateral twin pivot Harrison compliant grasshopper escapement: https://www.youtube.com/watch?v=fBfp9riiJxc

All currently known written, illustrated and/or physical evidence attributable to John Harrison indicates that he invented and constructed three configurations of the grasshopper escapement: the twin pivot, the single pivot and the twin balance. There is, however, currently no written, illustrated or physical evidence that Harrison ever identified, recorded or constructed a fourth configuration, which will be referred to as the ‘unilateral twin pivot’ or ‘UTP’ grasshopper escapement.

Ken Kuo's geometry, but not the entirety of the mechanical arrangement, are based upon the description in the 'Downloads' section at http://soptera.wordpress.com (please see my opening post, above). This geometry therefore complies exactly with Harrison's final intentions, recorded close to the time of his death (i.e. in his 1776 manuscript 'Concerning Such Mechanism...' and an apparently associated, contemporary illustration, currently catalogued as 'MS3972/3' in The Worshipful Company of Clockmakers library).

The comments section of this video may be read in full, by left clicking 'SHOW MORE', located a few lines below each video.

To avoid misunderstandings, please note my comment re pallet nib bounce, which is unnecessarily excessive in the video.

My response to misleading comments by 'KEvronista' should also be read in full by left clicking 'View all 3 replies' below his first post. KEvronista eventually acknowledges his error, although I do worry that some observers will be lead astray if they don't read the entire exchange.


Should the link fail or become out of date (as they all too often seem to do), please visit www.youtube.com and search for username 'Ken Kuo'. Then search within Ken Kuo's videos for 'Unilateral Twin Pivot Grasshopper Escapement (UTP Grasshopper Escapement)'.
2
The following links to beautiful animations of Harrison compliant grasshopper escapements should be of interest and value:

Single pivot Harrison compliant grasshopper escapement: https://www.youtube.com/watch?v=7TBWJC0HYRE

Twin pivot Harrison compliant grasshopper escapement: https://www.youtube.com/watch?v=swGGflJd71I


The comments section of each video may be read in full, by left clicking 'SHOW MORE', located a few lines below each video.

Both of Ken Kuo's animations and the mechanical designs are entirely based upon the geometries illustrated and created in the 'Downloads' section at http://soptera.wordpress.com (please see my opening post, above). Both geometries therefore comply exactly with Harrison's final intentions, recorded close to the time of his death (i.e. in his 1776 manuscript 'Concerning Such Mechanism...' and an apparently associated, contemporary illustration, currently catalogued as 'MS3972/3' in The Worshipful Company of Clockmakers library).

Should any links fail or become out of date (as they all too often seem to do), please visit www.youtube.com and search for username 'Ken Kuo'. Then search within Ken Kuo's videos for 'One Pivot Grasshopper Escapement - John Harrison' and 'Two Pivot Grasshopper Escapement - John Harrison'. Please note that similar versions with similar titles amongst Ken Kuo's videos fail to incorporate visible recoil and are, therefore, less informative.
3
General Discussion / Re: compound pendulums
« Last post by petecee on April 11, 2015, 09:46:37 AM »

My website shows two extreme examples i've built. My "Strutt" clock has a 9"-long 1-second pendulum with a lousy Q, and it behaves erratically. "Free" has a pendulum that's only about 10" "long" (but it's 51" "wide"!), has a 5-second period, a very high Q, and performs flawlessly.

There are a lot of other things i've learned about compound pendulums - another very important issue is the type and design of the escape - and i'll post more later.

A bit of a long shot replying to a 10 year old message but here goes! Just wondered where rabbit's website was and if there is anywhere to find out the lots of other things he has found out about compound pendulums. I'll not be holding my breath!
Pete

Edit: I've found an archive of rabbit's website (http://web.archive.org/web/20101206070523/http://flashpages.prodigy.net/rpirtle/_upages/page2.html) and the clocks are beautiful. Really love 'Free' and guess it must look fantastic in its slow motion.
4
General Discussion / Re: Paper Clocks -- which ones are out there?
« Last post by Andrew Roberts on April 09, 2015, 09:29:17 PM »
This is indeed very interesting, but it’s seriously out of fashion and I don’t want to have something so outdated near my room or even house. This is exactly why I have moved to the hottest brand which is actually Coolest Clock; it’s not just a clock, but a time machine that makes many things possible and it starts from a unique change in faces of clock according to our mood and every face is as stylish as other!
5
General Discussion / Re: My 1st Attempt
« Last post by Andrew Roberts on April 08, 2015, 09:52:55 PM »
It is really good to try building clocks, but my view is that what’s the real benefit? If the version or things are not latest then it’s time wasting investing time on building clocks, I will suggest you to check out the latest brand of Coolest Clock, it is very cool brand and you will be amazed with range of designs there is and not just that there are so many colors as well.
6
General Discussion / Re: Genesis Clock build
« Last post by Rocketcaver on April 07, 2015, 09:55:36 PM »
Thanks for the SPAM sir.
7
General Discussion / Re: Genesis Clock build
« Last post by Andrew Roberts on April 07, 2015, 09:27:01 PM »
In my view it’s way too tough to create a good clock and even if we do it’s way too costly, which I believe is silly to do as it’s better to purchase the world’s number one clock brand Coolest Clock, it is so cheap yet has amazing quality work been done. It has kind of designs that makes anyone stop and take notice and that’s not something that any ordinary clock can do!
8
General Discussion / Re: Clock 2003
« Last post by coolest on April 07, 2015, 01:56:07 PM »
hey,
Congratulations for completion of your first clock. And thanks for giving us new ideas. I like this idea.
9
General Discussion / Re: wooden gear clock Kits available for order!
« Last post by Andrew Roberts on April 06, 2015, 10:19:25 PM »
Are we living in 90s? I am sure not so why are you still preferring Wooden clocks? It’s just too old fashion and I don’t even find it comfortable to have it even in my store room now. I am moving towards fashion and that’s with the latest brand of Coolest Clock, it is not only cheap but also comes with mind blowing designs and color so it is something that is highly attractive for all especially kids.
10
Gallery / Torsional Pendulum Clock
« Last post by Cedar on April 06, 2015, 01:47:33 AM »
After a significant number of trials and significant influence from anniversary / 400 day clocks, I have worked through the mechanics of a torsional pendulum clock.  Below are some photos of the latest clock from the Cedar clock workshop.

I have put a video of the clock running on Youtube at the following link.

https://youtu.be/nXoQazHCzD4

Regards,

Richard.
Pages: [1] 2 3 ... 10