to the 1500 user manual

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1500
Follow Spot Yoke
Rev 1.1
© 2004 City Theatrical, Inc.
City Theatrical Follow Spot Yoke
Getting Started with the City Theatrical Follow Spot Yoke
Congratulations on the purchase of your City Theatrical Follow Spot Yoke. The City
Theatrical Follow Spot Yoke is a professional quality device that can provide smooth pan and
tilt operation to your lighting fixture. A heavy steel yoke gives mass and prevents vibration,
and ball bearings on the pan and tilt create extremely smooth movement, even on very long
throws.
The City Theatrical Follow Spot Yoke can be configured for use with the Source Four™ 19º50º, 10º, and 5º. A track allows the lighting fixture and any accessories to be balanced for
ease of operation.
Mounting Angles, one left and
one right
Tee Slot Extrusion, one set
of two pieces 10” long.
Shoulder Screw,
3/8” x ½”, 5/16”-18 thread,
3/16” Allen key.
Tilt Handwheel
Yoke
Pan Lock Knob
Pan Bearing
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City Theatrical Follow Spot Yoke
Mounting your Follow Spot Yoke
The City Theatrical Follow Spot can be mounted in a variety of ways. The bottom of the pan
bearing has female 1 ½” NPT pipe threads, and any length of 1 ½” pipe can be threaded into
it. Using a 36” piece of 1 ½” pipe threaded into a 50 lb. boom base is a typical method.
The Follow Spot Yoke can be mounted in a variety of positions, such as:
• On a stand of 1 ½” pipe with a boom base
• Underhung from a pipe
• Overhung on a hand rail
These diagrams illustrate three possible hanging methods:
Overhung on
handrail
Pipe and base mount
Underhung on pipe
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City Theatrical Follow Spot Yoke
Preparing Your Lighting Fixture
If you are planning to use a 19º-50º or a 10º Source Four, you will need to remove the
shutters from the lighting fixture. This is not necessary, but may be desirable for a 5º Source
Four to prevent the shutter blades from accidentally being moved during operation. Remove
the shutters by removing the four machine screws which hold the two halves of the Source
Four barrel together and exposing the shutter, pressure plate, and shutter spring parts.
Remove the shutter blades, but reinstall the pressure plates and springs. Do not reinstall the
existing four machine screws into the barrel. Go on the next step:
Two Angle Brackets allow your Source Four to be installed in the Follow Spot Yoke. Replace
the four ETC machine screws with the enclosed #8-32 x 1 ½” pan head Philips machine
screws into the Source Four’s existing #8-32 hex nuts.
Next, install the two Tee Slot Extrusions using the enclosed #8-32 x 3/8” flat head Philips
machine screws (three screws per extrusion). For 19º-50º or 10º Source Four, install the Tee
Slot Extrusions with the excess track overhanging toward the rear of the lighting fixture. For
the 5º Source Four, the Tee Slot Extrusions overhang the Angle Brackets toward the front of
the lighting fixture. See diagrams below.
Angle Bracket
Tee Slot
Extrusion
#8-32 x 3/8 Flat Head
Machine Screws (three)
For 5º Source Four
Tee Slot Extrusions overhang toward front of
lighting fixture. Shutters may or may not be
removed.
For 19º-50º or 10º Source Four
Tee Slot Extrusions overhang toward rear of
lighting fixture. Shutters must be removed.
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City Theatrical Follow Spot Yoke
Installing the Source Four into the Follow Spot Yoke
Note the two Tee Blocks that slide into the Tee Slot Extrusion. Using a 3/16” Allen key,
slightly loosen the two 3/8” x ½” socket head shoulder screws to free the Tee Blocks.
Carefully insert the Tee Slot Extrusions onto the Tee Blocks. Tighten the tilt handwheel.
Temporarily tighten the shoulder screws. Install four 4-40 x ¼” pan head machine screws,
one in each end of each Tee Slot Extrusion. These screws serve as safety devices to prevent
the Tee Blocks from accidentally slipping out of the Tee Slot Extrusion track.
Tee Slot
Extrusion
Shoulder screw
Tee Block
Tilt handwheel
Install the Lens Tube into the Source Four
Install the Lens Tube into the Source Four and install the two #10-32 screws (one plastic
thumbscrew and one Philips machine screw) that hold the Lens Tube to the lighting fixture.
Plug in the lighting fixture into a switch or dimmer and dress the cable to insure that it does not
restrict the yoke’s movement or its balance. Turn on the lighting fixture and adjust the
sharpness of the beam to the degree that you think is appropriate.
Balance the Lighting Fixture in the Yoke
The lighting fixture can be adjusted forward or backward in the Tee Slot Extrusion to establish
a perfect balance point. To test the balance, carefully loosen the tilt locking knob and feel if
the fixture is front heavy or back heavy. To adjust the balance, loosen the two shoulder
screws and evenly push the fixture forward or backward in the Tee Slot Extrusion until it
balances exactly. Lock the shoulder screws again. Test and repeat if necessary.
Adjust balance as needed
Install two #4-40 x 3/16” machine screws in
each track as safety devices to prevent
Tee Blocks from sliding through Tee Slot
Extrusion.
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City Theatrical Follow Spot Yoke
Using Other City Theatrical Accessories with Your Follow Spot Yoke
City Theatrical has created a range of accessories to make your Follow Spot more versatile
and easier to operate.
Part
Name
Number
2180
Drop-In Iris
1520
Follow Spot Yoke Handle
1360
Follow Spot Handle
1530
Manual Color Changer for
10º Source Four
Manual Color Changer for 5º
Source Four
Drop-In Boomerang for 19º50º Source Four
1535
1410
Use
Change size of beam
Provides handgrips at front and/or rear of Follow
Spot.
Clamps onto rear of Source Four to provide a
handgrip.
Manually scrolls six frames of color
Manually scrolls six frames of color
Manually changes six frames of color
2180
1520
1360
1530
1535
1410
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