Pendulum calculation

[........]

Am curious, did Bessler have access to UHMW ?
It would seem he did his work without modern invention.
Is it possible you or one of your colleagues could give a demonstration ?

[jim_mich]

Am curious, did Bessler have access to UHMW ?

Uh, are you serious? Bessler died almost 300 years ago. Polyethylene is a modern plastic first discovered im 1898 and then re-discovered by accident in 1933. Ultra high molecular weight (UHMW) polyethylene was not commercially available until the 1950's.

Is it possible you or one of your colleagues could give a demonstration ?

Demonstration of what ??


Welcome to the forum. I think your choice of a forum name sucks big time. It is going to get very confusing calling you ........ !

[justsomeone]

Quote from Fletcher:

P.S. no bushes work well on the threaded portion - I assumed you meant the threaded part for a nut - use the zinc bolts & not galvanized or hard steel.

Yes, I was refereing to the threaded portion ( not by choice ). Thanks for the reply.

[path_finder]

An interesting Web site for those concerned with the theory of the pendulum:
http://www.elmer.unibas.ch/pendulum/rpend.htm
See in particular the links in the paragraph 5 : bifurcation, chaos, bistability, etc.

[Gravitronic]

Sims showing Pendulum Tests.

When a mechanical linkage is added to the pendulum shaft to convert Cf's into a pendulum thrust force the Cf's generated are insufficient into terms of Work Done capability [F x D] to accelerate the pendulum sufficiently to violate CoE - it simply makes up the shortfall in Pe loss from a mass moving to a greater radius & affecting Angular Momentum & speed etc.

It cannot be leveraged to greater effect.

Ratchet & Pawls, One-Way Clutches etc are reasonably complicated to build in real world - an alternate is a stator at the pivot & a meshed rotor on the pendulum shaft [with a one-way bearing] that is pulled on release of the latching devices - the analogue I have built shows the generic method to accomplish this.

Boca Bearings has some reasonably priced clutch bearings. They're listed as one way bearings. I bought four for my device... $18.00 US each. 1 inch id, 1.3 od x 5/8... Just thought I'd pass this along

Another way that I saw on a video by Raymond Head was to use a couple of ratchet wrenches. They do have a little play though so it might be difficult to deal with that loss.

The Boca bearings I used I could not significantly measure any loss. On an arm I used that was 15 inches long, I was able to measure around .002 inch at 12 inches out from the shaft center line so it is relatively insignificant