I'll take lots of photos with rulers in them for this one to make it easier than scimitar, though its easier by design anyway. Other than the spring, most people probably have enough wood laying around, and there are no real complex cuts.. other than futzing with magnets..
Now that phones have slow motion camera ability it would be great to have a collection of videos on different trigger mechanisms explaining them in slow motion 🙂
Thanks for the tutorial, well done. I hope you'll find the time to show the mechanism used in other dual rotation sculptures, that require no magnets. (I've been accused of "cheating" when using them}
I always felt it was cheating as well, but it so simplifies the process and magnets are so cheap and readily available that it seemed easier to use them. I may try to do one without some day when I feel like being aggravated. :)
I plan on fighting gravity and coercing centrifugal force with a creation some time this spring (sans magnets), I'll try to document my aggravation and post to the forum. Thanks again for this video, very helpful.
I think youll find you dont need it. Its pretty intuitive as you start building it as to how it works. This is a pretty simple thing to build really. Just pay attention to how the trigger works in the simulation, once you get the concept its pretty easy to build.
The Vulcan Spring you have given the part number for is a "Constant Torque" spring. The website also lists "Constant Force" springs. Most kinetic website, including David C Roy talk of Constant Force Springs. What is the difference, is one better than the other? i.e Constant Torque vs Constant Force?
Ive used both, to be honest I havent seen much difference. They do try to explain the difference, but I suspect its not something easily noticable. They once told me the failure rate would be higher on a constant torque.. but I doubt Ill ever hit that number of cycles either way.
@@ArtofCNC I have a huge volume requirement if you can make it work in any position. The trigger needs to work as an escapement mechanism, Could you possibly redesign the device to work this way?
You could make the two inner wheels elliptical with a spring backed roller pressing on the wheels. That would in essence fake gravity. I have no interest in building such a thing, but it is possible to fake gravity . Pretty low efficiency escapement though..
Art. I noticed the DXF has the center of the brass pins offset and the center of the arched shaped wood piece different from the driven middle disk. Is that by design? What is the purpose of the offset?
I dont find that on my overview dxf? The brass pins are on a circle centered to the center of the disk. The arch is similarly centered from the disk / rotation center. Is this the overview dxf?
I'm using Vexx and Auggie. Auggie has a physics simulation mode built into it. Auggie and Vexx are both free software included with Gearotic's distribution.
Ahh, I see, yes your quite right, looks like it got shifted a bit as I copied it around. Sorry about that, the pins should be all centered as well as the arc. That drawing was meant really just to show the trigger itself and its relationship to the center post.
Calling this design Genius is an understatement. I'm familiar with David C. Roy's work. He doesn't use magnets as far as I know right? Also how long did you get it to go on one full round?
As I recall it runs between 1-2 hours on a full wind. It all depends on the weighting and balance of your vanes. Roy doesnt use magnets, that makes his the truly genius ones. :) , but thanks for the compliment.
I've been looking at Roy's videos, and came to the conclusion that he uses magnets between the two pawls. The freewheeling pawl always clicks closed as it goes backwards past the anchored pawl, then it is attracted closed as it comes up to the anchored pawl. I'd love to know if that's wrong/how he does it though.
@@MrDogfish83 Hi MrDogfish83. Did you find out any more about David Roy using magnets? I'm building my version of his "Solo"-Sculpture and I am at the stage of getting things into tune. If you look at this video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-U-9CbRX9mHc.html at 2:23: The left (anchored) pawl moves up and down. I doubt it's all done by gravity. What are your thoughts? Kind Regards, Stefan
Hello Art, great video, fun mechanism. I would like to build this ticker, but I have a problem: How is this sculpture fixed to a wall? Do you need a seperate part? I am so confused... :-) Greetings from germany, Paul
Hi: The brass shaft on mine is just pressed into a hole in the wall into a stud. As its only touched by bearings, it doesnt hurt it to be simply pressed in a hole. Art
you all prolly dont care but does someone know of a trick to get back into an Instagram account..? I stupidly forgot my account password. I would appreciate any tips you can give me.
@Oscar Carson I really appreciate your reply. I found the site thru google and im trying it out now. Looks like it's gonna take quite some time so I will reply here later when my account password hopefully is recovered.
This type of spring requires a disk of appropriate size to roll backwards on to derive the force, it is unlike a conventional clock spring. The sizes of the cylinders are specified by the maker of the springs. You can, of course use some other type of spring likk a clock spring, in which case the pin would work fine I suspect, but the constant torque springs have specific requirements..
