CMU School of Drama


Monday, September 12, 2016

Dangers Of Unpredictable Load Distribution | Safe Load Monitoring Systems

LDI content from Live Design: Eilon Engineering, which is celebrating its 40th anniversary, created this video that explains the dangers of unpredictable load distribution on suspended loads. As productions become more complex and weight loads increase to meet such creative and technical lengths, a reliable continuous load monitoring system is of vital importance. The video also discusses the flexibility of the Ron StageMaster load monitoring system, which features wired and wireless models. Visit Eilon Engineering at LDI 2016.

1 comment:

Drew H said...

I first saw this video on facebook and it immediately scared me. It makes complete sense that loads on chainmotors are not evenly distributed. If there are 2 motors on a beam, then they are probably equal or close to it (so long as there is an even or symmetrically balanced load). But when you have a load that would require 3 or more picks, it is vital that all three picks be carrying an even amount of load and that is pretty much near impossible to know without a gauge on the hoist. The other scary aspect of this has nothing to do with chain motors. Any time something is rigged from more than 2 points we usually test to see if all the points are holding even weight by seeing if the rigged piece is level and if the lines feel like they have the same tension. If you are rigging something that requires 5 1/16” pick points but really only 2 points are holding most of the weight, it is possible that the entire rig will fail. Does this mean it is safest to only rig items with 2 points and maybe a third or more (that are not included in the weight holding capacity) to keep items from sagging. That way no matter what happens, there are always points that can support the structure. But even then, it seems like failure is very possible. Lastly, back to the chain motors. The video claims that even with a slightest bump on one motor, there could be loads changing hundreds of pounds. This sounds like it would classify as a shock load which seems bad for a chain motor. If nothing else this video scared me, and I guess that’s the goal so I can buy a product.