Please note: The 33:1 ratio was manufactured with the bushing extending 2.4mm out of the face. For most uses, this is beneficial as it adds more support. But it will not work with our flush-mount bearing blocks. This applies to motors purchased after July 26.
The Silver Spark line of motors has the same diameter gearhead as the Gold Sparks
, but the gears are a larger pitch. This means less worrying about stripping teeth in your bigger or heavier applications!
(Comparing Gold Spark output gear to Silver Spark)
• Extra-long 3mm shaft for mounting wheels directly with the option to use a bearing block
for support on the wheel's far side.
• Same 11mm face mount pattern as Gold Spark motors.
• All-metal spur gearhead mated to a Mabuchi FK-050 motor.
• 9 different gear ratios: 11.1, 22.2, 33.3, 50, 83.3, 100, 200, 300, and 600 :1. One twice as fast, and one twice as slow as the Gold Sparks!
• Weight between 28 - 32grams (0.99 - 1.13oz).
These motors make it super simple to get a robot moving! Just pick up a pair of Snap Wheels
and Snap Hubs
to mount them, solder on a pair of tinyESCs
and your motors are ready to be driven by radio control
! For mounting the motors, use 2-56 screws
and our custom motor mounts
. We now also carry 3mm bearing blocks
for supporting the shaft in heavy robots or weapon systems, and Flat Motor Mounts
for when you want to face-mount in a panel.
Note - For strenuous conditions (such as robot combat), we recommend removing the gearbox and ensuring that the motor vent hole does not line up with a gearbox pin. If it does, simply rotate the gearbox 180 degrees and reattach. Use Loctite on the screws that hold the gearbox to the motor. This will ensure they cannot separate during competition!
|Motor (Mabuchi FK-050SH-13125) Specifications
Operating Voltage: 3V - 18.5V (>10V decreases motor life)
|Nominal Voltage: 6Vdc
No Load RPM: 11530rpm
No Load Current: 0.09A
Stall Current: 1.3A
Stall Torque: 0.0461kg-cm (0.64oz-in)
Kt: 0.0352kg-cm/A (0.49oz-in/A)
Peak Efficiency: 52%
RPM @ Peak Eff: 9100
Current @ Peak Eff: 0.34A
Click here for the motor torque, current, rpm and efficiency curve.
ratios 11: 11.5mm (0.45in)
ratios 22, 33, 50: 12.7mm (0.50in)
ratios 83, 100: 14.3mm (0.56in)
ratios 200, 300: 16.4mm (0.65in)
ratios 600: 17.9mm (0.70in)
Motor Length: 28.7mm (1.13in)
Gearbox Diameter: 16mm (0.63in)
Shaft Diameter: 3mm (0.12in) with flat along length
Shaft Length: 38mm (1.5in)
Mounting Holes (2): #2-56 spaced 11mm (0.433in) apart
-do not use screws that protrude more than 2mm (0.078in) into gearbox
ratios 11: 28g (0.99oz)
ratios 22, 33, 50, 83, 100: 29g (1.02oz)
ratios 200, 300: 31g (1.09oz)
ratios 600: 32g (1.13oz)
All ratio gearboxes can be interchanged because they use the same 14T pinion gears on the motor.
So (for example) you can remove the 50:1 ratio gearbox from its motor and replace it with a 33:1 ratio gearbox for more speed - without needing to desolder the motor! (Might want to swap the stickers so you know what's in the robot!)
|No Load Speed @ Gear Ratio/Voltage
(Click to Enlarge)
Motors have been tested to work up to 22.2V (6 lipoly cells), but don't expect the motor to run that high forever!
|Maximum Torque @ Ratio/Voltage (kg-cm) (oz-in)
(Click to Enlarge)
Exceeding 9.72kg-cm (135oz-in) will damage the output gear stage. Do not stall the motors highlighted in red at the indicated voltage.