Re: [Phys-l] techshop opportunity

[Bernard Cleyet <bernardcleyet@redshift.com>]

The arxiv article is very interesting; thanks.

If you want mechanical, only the instructions (drwngs, etc.) for the slave of the Short are in the second V. of Amateur Telescope Making (1980; more recent skip thhis, as replaced by quartz clocks).  I think Bryan evne sells the casting.  I suggested electromechanical, as making the remontoire, wheels, etc.  requires CNC stuff and would be a year long job, at least for bc.  But making just a pendulum would require the machine shop, and not be very time consuming.   For chaotic pendulua, etc. I suggest "The Pendulum" Baker and Blackburn.  wherein they describe a forced damped and compare data collected w/ a numerical simulation for its eq. of motion.  Curiously not in the bibliography, but there is an AJP article by them on the inverted pendulum, plus a number of articles in the International J. of Bifurcation and Chaos.  Check out also Chaotic dynamics (same Baker and Gollub).  

When I was at UCSC the chaos group played w/ a Strut pendulum  (invertted and driven by a speaker.  Not much machining there tho.)

bc  has only one old clock. (Blanc purchased by grandpa Pierre Cleyet)

p.s. you have seen my compound pendulum constructed to obtain viscous damping?


http://www.cleyet.org/images/img_6299+Pendulum%20dissipation/Pendulum%20Dissipation.mov

On 2011, Jan 03, , at 13:36, Stefan Jeglinski wrote:

> > A long period pendulum clock, w/electromagnetic escapement.
> > Here's a short period one:
> > http://www.bmumford.com/clocks/em2/index.html
>
> Interesting. I used to collect clocks, and still have 7 French 
> mantles, 2 American mantles, and 2 German grandfathers. All 80-180y 
> old. Think I'm more fascinated with well-built mechanical clocks than 
> accurate electronic-driven clocks, Mumford's notwithstanding.
>
> I think of more interest to me would be the manufacture of an 
> interesting/unusual/non-tiny pendulum *structure* that exhibits 
> unusual (to the lay person anyway) properties, eg, very long period, 
> or a mix of chaotic/nonchaotic behavior (inspired by the 
> magnet-driven executive desktop toy, or in a different vein, [1]). I 
> do have a large high spacious entryway that does nothing but convect 
> heated air up to warm the 2nd-floor ceiling :-)
>
> [1] http://arxiv.org/abs/0902.1829
>
>
> Stefan Jeglinski
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