Theatre Design & Technology - Spring 2013 - 45

Construction Details
The first challenge with how to move items both horizontally
and vertically is to make the two axes independent. Figure 1
shows the method that we used to accomplish this. It begins
with a track with a traveling sheave assembly attached to the
carriers. We used Triple E's UNIBEAM track to accommodate
our load. As the carriers were only rated with a working load
of 500 pounds each, we chose to use four of them to support
the lifting sheaves. This gave an ultimate strength of at least
6,000 pounds, which maintained the 10:1 design factor for
the system. A counterweight arbor was added to allow the use
of a smaller capacity winch.
The lifting cable is rigged as shown in figure 1 by the
dashed line (one of the two lifting cables is omitted for
clarity). It comes up from the flown element, goes over the
traveling sheave, is muled to a sheave on the top of a counterweight arbor, and then comes back to another sheave at
the far end of the track which brings it back to an anchor
on the carrier.
To raise or lower the flown element, the counterweight
arbor is moved by half of the desired distance (e.g., the arbor
is pulled downward two feet to raise the element four feet).
The arbor and blocks were less than half of the height of the
track so there was plenty of available travel in the system. This
requires a force of twice the weight of the item being flown,
which led to the next step.

Because the elements being flown were expected to
vary in weight from nothing (at the start of the second act
the rig was used to deliver Sweeney's chair, and then it flies
out empty) to 600 pounds, we chose a closed loop system to
move the counterweight. This way the counterweight can be
enough to lift half of the anticipated maximum weight, and
the winch can either pull down on the arbor to lift heavier
objects or pull up on it to bring the cables in when empty or
flying lighter objects.
To lift half the weight of a 600-pound cage would require 600 pounds of counterweight (this was because of the
1:2 mechanical advantage lessening the counterweight effect). An additional pull of 600 pounds in either direction
would be required from the winch in order to work at the
extremes, so the winch was rigged with a 2:1 mechanical
advantage against the arbor. The winch rigging is shown
in figure 2 as an alternating long and short dashed line. It
starts from the winch (not shown, but it would be off to the
left of the diagram), is muled toward sheaves at the top and
bottom of the arbor, and is terminated at the head block or
the muling block, respectively.
The forces exerted on the head block and muling block
become very large in this arrangement. For a 600-pound flown
element the force could reach 2,500 pounds. The head block
was dead-hung from the fly grid as well as being anchored horizontally, and the muling block on the floor held a substantial

Figure 1. Illustration of independent
horizontal and vertical axis
Figure 2. Illustration of winch rigging

s p r i n g 2013

theatre design

& technology

43



Table of Contents for the Digital Edition of Theatre Design & Technology - Spring 2013

Contents
Theatre Design & Technology - Spring 2013 - 1
Theatre Design & Technology - Spring 2013 - 2
Theatre Design & Technology - Spring 2013 - 3
Theatre Design & Technology - Spring 2013 - Contents
Theatre Design & Technology - Spring 2013 - 5
Theatre Design & Technology - Spring 2013 - 6
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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Dec
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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965May
https://www.nxtbookmedia.com