Kinetic sculpture designed by Clayton Boyer

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marklazarz
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Kinetic sculpture designed by Clayton Boyer

Post by marklazarz »

I recently built a kinetic sculpture called "Zinnia" from Clayton Boyer.  For anyone interested in learning about another kinetic drive mechanism, I highly recommend looking into Clayton's commercially available plan.  Without giving away secrets, a summary of my build can be seen here http://markswoodchips.com/zinnia-kineti ... ture/.html.
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ArtF
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Re: Kinetic sculpture designed by Clayton Boyer

Post by ArtF »

Mark:

Awesome job. Unlike my Bat sculpture, you built the proper mechanism,
I ended up using some magnets in my release, where you have the original
mechanism. Congrats on a great job.. It seems to work very very well..

  Grrr... I may have to redo mine now to properly work that mechanism..

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marklazarz
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Re: Kinetic sculpture designed by Clayton Boyer

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The mechanism is simple, once you see it, but I did learn that friction plays a big role in whether or not it will run.  There are 6 ball bearings in the sculpture and I had to soak them in mineral spirits for a few days to dissolve the grease.  That helped but then I had to soak them in Silicone lubricant to reduce the friction further.  After the friction is dealt with, it's a matter of weights and timing, much like your Scimitar.
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Re: Kinetic sculpture designed by Clayton Boyer

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Mark:

  I hadnt thought about treating bearings that way for such a sculpture.. Thanks for that!!!

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kobi
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Re: Kinetic sculpture designed by Clayton Boyer

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thanks Mark for the tip about treating your bearings...really has helped!!

best,

Kobi
danmauch
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Re: Kinetic sculpture designed by Clayton Boyer

Post by danmauch »

marklazarz wrote: I recently built a kinetic sculpture called "Zinnia" from Clayton Boyer.  For anyone interested in learning about another kinetic drive mechanism, I highly recommend looking into Clayton's commercially available plan.  Without giving away secrets, a summary of my build can be seen here http://markswoodchips.com/zinnia-kineti ... ture/.html.
How long does your Zinna run from one winding?
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Re: Kinetic sculpture designed by Clayton Boyer

Post by ArtF »

10 minutes from my calculations.. :)

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marklazarz
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Re: Kinetic sculpture designed by Clayton Boyer

Post by marklazarz »

Clayton touts 40 - 45 minutes.  My actual run time is about 20 minutes.  The less friction, the more revolutions of the flywheels before gravity reverses the spin and triggers another impulse.  Based on my experience, friction, offset weight amount and timing, in that order, determine how long it will run.
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Re: Kinetic sculpture designed by Clayton Boyer

Post by ArtF »

20 minutes is pretty good. Not long enough to annoy, but long enough to amaze. :)

Great job..

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Kineticrazy
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Re: Kinetic sculpture designed by Clayton Boyer

Post by Kineticrazy »

Mark,
  Wondering what size spring (pounds of force) you used for "Zinnia"? Could you get longer run times with a longer or heavier spring?
Looks fantastic, very nice work. I'm thinking of an attempt at my own design...but I'll be using a scroll saw to cut my parts...sigh.

Eric
marklazarz
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Re: Kinetic sculpture designed by Clayton Boyer

Post by marklazarz »

Eric:

Clayton specifies this spring for his Zinnia http://shop.sdp-si.com/catalog/product/ ... 3x51-20006

I wind the flywheel about 18 times for a full run with this spring so it's pretty long.  Run time is inversely proportional to friction, the number 1 factor for getting the most run time out of the sculpture.  There are not many parts to Zinnia so scroll sawing should be no problem although you will need a saw capable of reaching over 12" radius.

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Re: Kinetic sculpture designed by Clayton Boyer

Post by Kineticrazy »

Thank you for the info. I'm surprised it's only a pound of force. I've got my first kinetic engine running on a drop weight of one pound, 30 inch drop. I tried upping the weight, for longer run time(presently 15-20 min), but my pawl would not disengage on the return rotation with more weight added. I assumed my ratchet design was at fault or I needed to add weight to one side of my wheel to disengage the pawl.
  Have you experimented with heavier springs? I accidentally bought a 4.5 lb. 40 inch constant force spring (not constant torque) and was going to attempt trying it by drawing it out linearly (one spool) and attaching a string to the free end and winding the string to my drive spool and ratchet.
Any thoughts on whether It will work? Will enough counter weight added be possible to disengage the pawl?

Keep in mind I have been using a pawl and ratchet of my own design (imagine a saw tooth ratchet with magnets embedded in the pawl) and not using David Roy's design yet. Do you think David's pawl design can handle more weight?


I've got 30 inches of throat on my Dewalt scroll saw (my favorite tool in my shop), and I can bend the blade ends 90 degrees if I have a long work piece. That gives me unlimited throat! (picture using the saw from the side, not the front)

Thanks again for the information, I hope you don't mind the questions...

Genuinely kineticrazy,

Eric
marklazarz
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Re: Kinetic sculpture designed by Clayton Boyer

Post by marklazarz »

Eric:

No, I have not experimented with different springs.  Disengaging the pawls falls under the category of timing, and a lot goes into it.  The only advice I can offer is to build something and then tinker with it until it runs.  You develop a feel for timing variables when you see the mechanism in motion.  Proven commercially available plans still require some fiddling.  If you design your own, don't expect the first iteration to be your masterpiece.

I have not attempted to build any David Roy drive engines, maybe later next year.  Although I'm retired, I don't have enough time in the day to accomplish all the things I want to.  Busy with Christmas gifts, modifying the control on my CNC, learning Aspire, playing with Gearotic, and now shoveling snow.

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Re: Kinetic sculpture designed by Clayton Boyer

Post by ArtF »

Mark:

All so true. I have a kinetic engine prototype half finished, lasers that need work, galvo cude to test with, and
the kinetic engine to complete, there just isnt enough time in the day. :)

  When building any kinetic object I really advise playing with every dimension in it.. you often improve it..

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Dan Mauch
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Re: Kinetic sculpture designed by Clayton Boyer

Post by Dan Mauch »

Last year I posted my version of Zinna. One of the improvements I made that really helped increase the duration of the machine was to make the drive mechanism out of 5mm acrylic.
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