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SpringRC SM-S4303R Continuous Rotation Servo

SKU: POLOLU-1248

$17.89 AUD, inc GST
$16.26 AUD, exc GST

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SpringRC SM-S4303R Continuous Rotation Servo
17.89 AUD

SKU: POLOLU-1248

$17.89 AUD, inc GST
$16.26 AUD, exc GST

View our maker favourites for this product which are likely to be a great alternative.

In stock, with a short lead time. 1255 units dispatch in 4 to 9 days (in addition to the shipping method you choose). Our timing and stock is accurate. Delivery to you by Thu, 28th of Dec with Express Post within Australia.

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Overview

The SM-S4303R is a standard-sized servo that has been built by SpringRC specifically for continuous rotation. At 6 V, it has a maximum rotation speed of 54 RPM (no-load) and can produce up to 71 oz-in (5.1 kg-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 1.5 ms, 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 11″ (270 mm) 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 Pololu's servo controllers and has a Futaba-compatible output shaft, which means it works with Pololu's 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: Pololu's Futaba servo wheels are a very tight fit with this servo’s output shaft (tighter than Pololu's other continuous rotation servos). They do work together, but typically you must push hard to get them on.

Continuous rotation servo comparison

Continuous rotation servo size comparison. From left to right: SpringRC SM-S4303R, Power HD AR-3606HB, Parallax, and FEETECH FS90R.
SpringRC SM-S4303R PowerHD AR-3606HB Parallax (Futaba S148) FEETECH FS90R
Max Speed @ 6 V: 54 RPM 71 RPM 50 RPM 130 RPM
Stall torque @ 6 V: 71 oz-in 93 oz-in 42 oz-in 21 oz-in
Max Speed @ 4.8 V: 43 RPM 62 RPM 39 RPM 100 RPM
Stall [email protected] 4.8 V: 46 oz-in 83 oz-in 33 oz-in 18 oz-in
Weight: 41 g 40 g 43 g 9 g
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
Documentation and Resources:

Product Comments

We deliver Australia-wide with these options:

  • $3 for Small Items (4-6 days, not tracked, only available on selected small items)
  • $6.95 for Standard Post (2-4 days, tracked)
  • $8.95 for Express Post (1-2 days, tracked)
  • Pickup - Free! Only available to customers who live in the Newcastle region (only after we email you to notify your order is ready)

International Orders - the following rates are for New Zealand and will vary for other countries:

  • $11.49 for Pack and Track (3+ days, tracked)
  • $16.50 for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount might increment based on the weight of your order.

Our physical address:

Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia

Please checkout our customer service page if you have other frequently asked questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.