Theatre Design & Technology - Summer 1991 - 41

A

Curved
Track

and

Knife
System
A.D.CARSON

very year, a design for our
srage (an exrended righr
rhrusr) will call for rhe use
of a curved rrack and cable
sysrem. For mulri-scene
producrions, we need ro
deliver scenery and furnirure pieces down
cenrer from righr sidesrage spaces up left
and righr of our searing (Figure 1). Afrer
a few rough crials, we have developed a
simple, srurdy sysrem.
The drive knife, rhe floor sheave and
rhe crack are rhe main componenrs of rhe
sysrem. The drive knife (Figure 2) is
machined ro our order ar a local garage.
Ir fearures inser bearings ro ease fricrion
on rhe crack sidewalls, keyways for
inserring rhe 3/16 " drive cables (secured
wim a nico-press srop sleeve), and a posr
rhar exrends above rhe deck (Figure 3) for
connecrion ro casrered palerres, furnirure,
erc. The posr is free ro pivor in irs
mounring block in rhe scenic unir as ir
moves over rhe curved crack. Alignmenr
of me knife and unir is nor consranr.
On curved rrack, a second knife is
required on rhe moving unir for
guidance. For a single crack sysrem, we
exrend anorher Va" bearing on a Y/' rod
from me scenic unir down inro rhe crack.
For rhe crossing rracks shown, we used a
second knife machined wirhour me cable
keyways. The lengrh of rhis "guide knife"
easily passed rhrough rhe inrersecrion of
rwo cracks.
The second parr of rhe sysrem is rhe
floor sheave. The rerurn and muling
sheaves for rhe sysrem are buried berween
layers of rhe plywood deck. I have nor
found a manufacrurer offering a block as
narrow as rhe one we made for rhis
sheave (Figure 3). The narrow design will
keep a slack cable confined ro rhe sheave.
The rrack is made our of rhree layers of
plywood placed over a ser of srock
plarforms (see Figure 3).
5raggering rhe plywood seams allows
for screngrh and an even layoue. Firsr, a
Y2" ply base layer is used ro cover rhe
srock plarforms. This provides a primary

layour silhouerre and a labelled work
surface. Then rhe 3A" plywood cable layer
is arrached and rhe rerurn channels and
spaces are cur for rhe floor sheaves. The
guide layer along wirh any floor dressing
(ie., planking) is laid our lase. We rour rhe
1W' rrack in four passes wirh a 3A" bie.
We had worried inirially rhar rhe cable
mighr jump our of rhe rrack on rhe
radius. However, graviry combined wirh
very lighr cable rension keeps rhe cable in
place. In facr, roo much rension will press
rhe cable inro rhe curve of rhe crack
crearing excessive drag. We adjusr sysrem
rension by hand ar rhe winch. The very
narrow floor block design has nor yer
slipped a cable-even when sorely
rempred by a slack sysrem.
Rolling scenery on rhis sysrem has
ranged from desks and chairs ro 4x8
wagons and even larger, low profile
pallers. \'



Table of Contents for the Digital Edition of Theatre Design & Technology - Summer 1991

Contents
Theatre Design & Technology - Summer 1991 - 1
Theatre Design & Technology - Summer 1991 - 2
Theatre Design & Technology - Summer 1991 - 3
Theatre Design & Technology - Summer 1991 - Contents
Theatre Design & Technology - Summer 1991 - 5
Theatre Design & Technology - Summer 1991 - 6
Theatre Design & Technology - Summer 1991 - 7
Theatre Design & Technology - Summer 1991 - 8
Theatre Design & Technology - Summer 1991 - 9
Theatre Design & Technology - Summer 1991 - 10
Theatre Design & Technology - Summer 1991 - 11
Theatre Design & Technology - Summer 1991 - 12
Theatre Design & Technology - Summer 1991 - 13
Theatre Design & Technology - Summer 1991 - 14
Theatre Design & Technology - Summer 1991 - 15
Theatre Design & Technology - Summer 1991 - 16
Theatre Design & Technology - Summer 1991 - 17
Theatre Design & Technology - Summer 1991 - 18
Theatre Design & Technology - Summer 1991 - 19
Theatre Design & Technology - Summer 1991 - 20
Theatre Design & Technology - Summer 1991 - 21
Theatre Design & Technology - Summer 1991 - 22
Theatre Design & Technology - Summer 1991 - 23
Theatre Design & Technology - Summer 1991 - 24
Theatre Design & Technology - Summer 1991 - 25
Theatre Design & Technology - Summer 1991 - 26
Theatre Design & Technology - Summer 1991 - 27
Theatre Design & Technology - Summer 1991 - 28
Theatre Design & Technology - Summer 1991 - 29
Theatre Design & Technology - Summer 1991 - 30
Theatre Design & Technology - Summer 1991 - 31
Theatre Design & Technology - Summer 1991 - 32
Theatre Design & Technology - Summer 1991 - 33
Theatre Design & Technology - Summer 1991 - 34
Theatre Design & Technology - Summer 1991 - 35
Theatre Design & Technology - Summer 1991 - 36
Theatre Design & Technology - Summer 1991 - 37
Theatre Design & Technology - Summer 1991 - 38
Theatre Design & Technology - Summer 1991 - 39
Theatre Design & Technology - Summer 1991 - 40
Theatre Design & Technology - Summer 1991 - 41
Theatre Design & Technology - Summer 1991 - 42
Theatre Design & Technology - Summer 1991 - 43
Theatre Design & Technology - Summer 1991 - 44
Theatre Design & Technology - Summer 1991 - 45
Theatre Design & Technology - Summer 1991 - 46
Theatre Design & Technology - Summer 1991 - 47
Theatre Design & Technology - Summer 1991 - 48
Theatre Design & Technology - Summer 1991 - 49
Theatre Design & Technology - Summer 1991 - 50
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Theatre Design & Technology - Summer 1991 - 54
Theatre Design & Technology - Summer 1991 - 55
Theatre Design & Technology - Summer 1991 - 56
Theatre Design & Technology - Summer 1991 - 57
Theatre Design & Technology - Summer 1991 - 58
Theatre Design & Technology - Summer 1991 - 59
Theatre Design & Technology - Summer 1991 - 60
Theatre Design & Technology - Summer 1991 - 61
Theatre Design & Technology - Summer 1991 - 62
Theatre Design & Technology - Summer 1991 - 63
Theatre Design & Technology - Summer 1991 - 64
Theatre Design & Technology - Summer 1991 - 65
Theatre Design & Technology - Summer 1991 - 66
Theatre Design & Technology - Summer 1991 - 67
Theatre Design & Technology - Summer 1991 - 68
Theatre Design & Technology - Summer 1991 - 69
Theatre Design & Technology - Summer 1991 - 70
Theatre Design & Technology - Summer 1991 - 71
Theatre Design & Technology - Summer 1991 - 72
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