Theatre Design & Technology - Fall 1997 - 36
A TURNTABLE DRIVE MECHANISM
Iiln Knapp and Mark Shanda
Ohio State University
n;", ;~
T
shows doting the Oluo State
1996-97 production season required a 30-foot diameter
turntable. As a result we needed to develop a quiet, efficient drive mechanism which would gradually start the revolve moving, stop instantly when on spike, and be
affordable. Given the size of the turntable and its placement
on stage, we sought a different drive mechanism from
those used on our smaller turntables. One was a perimeter
cable wrap with a hand-winch, and the other, a long pivot
axle extending beneath stage, turned by stagehands.
Research into published designs, including those found
in theatre technology texts, past USl11 Theatre Technology Exhibit catalogs, Yale Technical Briefs, and Theatre Crafts,
yielded variations on the systems with which we were already
familiar. The exception was an October, 1984 Theatre Crafts
article by Stancil Canlpbell, titled "Motorized 1\lrntable.ยทยท
Campbell's solution placed an electric motor driven wheel beneath a 20-foot turntable. The system relied on the weight of
the revolve to maintain friction between the underside of the
deck and the drive wheel. We considered this solution, but
were cautioned by Campbell's problems Witll uneven loading
causing yariable friction when in use. The mechanism we ultimately designed more closely resembled the drive system used
in many carnival rides. These consist of one or two rapidly
spinning pneumatic tires coupled with a separate system that
pushes the tires against the edge of the ride transferring force
through friction (Fig. 1).
The key to this design, illustrated in the follO\ying figures,
is a mechanism consisting of a sliding motor mount (Fig. 2)
shifted by a 2" x 2-i" pneumatic cylinder (McMaster-Carr
#6211 K 6). Tlus eliminates tlle need for a more expensive
variable speed motor drive. When compressed air is supplied
to the cylinder, it forces the spinning tire against the turntable
edge (Fig. 1). This gradual application of force results in vel)"
smooth starts and stops. Areversible, c-face, 2-hp motor/gear
reducer combination provides the power to a 10" pneumatic
wheel (I -3/8" bore, from Caster Connection), all of which we
secured to the sliding motol~mount. This mount consists of a
pair of one-inch diameter shafts (McMaster-Carr #6061K66)
each can)ing l\yo linear pillO\Y blocks (McMaster-Carr
#6255K36).
\lote that the nlrntable itself is a lanunated deck on in-
I Reverse Drum Motor Switch
2Air Input
3 Pneumatic Switch
4. Exhaust Hose
5 Needle Valve
6 Air Hose
7 Pneumatic Cylinder
8 Cylinder Rod
9 Clevis and Pin
ID Pneumatic Wheel
SIDE VIEW - ENGAGED
F
ALL
1
9
9
-
TD&T
11 Pillow Block
12 Turntable
13 Linear Pillow Block
14 Stage Floor
15 Flexible Shaft Coupling
16 Reducer
17 Rotating Shaft
18 Motor
19 Electric Cable
20 Linear Shaft
Table of Contents for the Digital Edition of Theatre Design & Technology - Fall 1997
Contents
Theatre Design & Technology - Fall 1997 - 1
Theatre Design & Technology - Fall 1997 - 2
Theatre Design & Technology - Fall 1997 - 3
Theatre Design & Technology - Fall 1997 - Contents
Theatre Design & Technology - Fall 1997 - 5
Theatre Design & Technology - Fall 1997 - 6
Theatre Design & Technology - Fall 1997 - 7
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