Overview
The SM-S4303R is a standard-sized servo that has been built by SpringRC specifically for continuous rotation. At 6V, it has a maximum rotation speed of 54RPM (no-load) and can produce up to 71oz-in (5.1kg-cm) of torque. It features two ball bearings on the output shaft for reduced friction, and it offers easy access to the rest-point adjustment potentiometer. The servo can be controlled using a direct connection to a single microcontroller I/O line without any additional electronics, which makes it a great actuator for beginner robotics projects.
The SM-S4303R continuous rotation servo converts standard RC servo position pulses into continuous rotation speed. The default rest point is 1.5ms, but this can be adjusted by using a small slotted screwdriver to turn the middle-point positioner. Pulse widths above the rest point result in counterclockwise rotation, with speed increasing as the pulse width increases; pulse widths below the rest point result in clockwise rotation, with speed increasing as the pulse width decreases.
The servo has an 11³ (270mm) lead that is terminated with a JR-style connector and includes additional servo horns and mounting hardware. The following picture shows an example of the hardware that might be included (actual hardware could vary):
This robotics servo is compatible with our servo controllers and has a Futaba-compatible output shaft, which means it works with our servo wheels and sprockets. If you are looking for a similar servo that is capable of limited-range position control as opposed to continuous rotation speed control, consider the Power HD standard servo 6001HB, which has comparable size, weight, speed, and torque.
Note: Our Futaba servo wheels are a very tight fit with this servo#8217;s output shaft (tighter than our other continuous rotation servos). They do work together, but typically you must push hard to get them on.
Continuous rotation servo comparison
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Continuous rotation servo size comparison. From left to right: SpringRC SM-S4303R, Power HD AR-3606HB, Parallax, and FEETECH FS90R. |
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SpringRC SM-S4303R |
PowerHD AR-3606HB |
Parallax (Futaba S148) |
FEETECH FS90R |
Max Speed @ 6V: |
54RPM |
71RPM |
50RPM |
130RPM |
Stall torque @ 6V: |
71oz-in |
93oz-in |
42oz-in |
21oz-in |
Max Speed @ 4.8V: |
43RPM |
62RPM |
39RPM |
100RPM |
Stall torque@ 4.8V: |
46oz-in |
83oz-in |
33oz-in |
18oz-in |
Weight: |
41g |
40g |
43g |
9g |
Size (mm): |
41.3—20.7—40.2 |
40.5—20.0—38.0 |
40.5—20.0—38.0 |
23.2—12.5—22 |
Price: |
$12.95 |
$14.95 |
$13.95 |
$4.95 |