G
GW
WS
S™
™
S
Se
er
rv
vo
o
3
36
60
0°
°
M
Mo
od
di
if
fi
ic
ca
at
ti
io
on
n
Revision: December 22, 2010
1300 NE Henley Court, Suite 3
Pullman, WA 99163
(509) 334 6306 Voice | (509) 334 6300 Fax
Doc: 514-004 page 1 of 2
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
Overview
This document describes the steps necessary
to modify a GWS Servo for continuous rotation.
Please note: performing this modification
will void both GWS and Digilent warranties.
Features of the GWS Servo include:
• 0.23 second/60 degree rotation with 47
oz-in of torque at 4.8V
• 0.18 second/60 degree rotation with 56
oz-in of torque at 6V
• 3-pin Futaba-style connector
• a variety of servo horns, grommets, and
mounting screws
The GWS Servo can be used for many
applications. The most common use of servos
is as actuators. Their ability to move with
relatively high torque through a path at
constant velocity makes them very useful.
However, a servo’s limited rotation (~215
degrees in this case) is a barrier to some
designs. There is a tradeoff to modifying a
servo for continuous rotation. To allow the
servo to continuously rotate, the feedback
sensor must be disabled, which effectively
turns the servo into a high torque, low rpm
motor. The speed of the servo’s rotation is
controlled with Pulse Width Modulation.
Required hardware:
• GWS Servo
• Phillips screwdriver
• utility knife
GWS Servo
Instructions
Step 1: Remove the screw that attaches the
wheel to the servo.
G
GW
WS
S
S
Se
er
rv
vo
o
3
36
60
0°
°
M
Mo
od
di
if
fi
ic
ca
at
ti
io
on
n
www.digilentinc.com page 2 of 2
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
Step 2: Remove the four screws at the top
corners of the servo.
Step 3: Remove top of case to expose gears.
Step 4: Remove gears to expose sensor
bracket.
Step 5: Remove key from drive gear with a
utility knife.
Step 6: Remove sensor bracket, taking care to
leave the sensor at the angle pictured.
The servo modification is now complete.
