Tech Thursday

Looking for a simple yet sturdy way to mount a motor and an ATR shaft without buying a welded chassis? Try our motor mount tubes, which we machine it to mount our motor mount plates. The other side fits a flanged ball bearing. Slide a wheel shaft through the bearing onto the motor shaft and fix a couple of shaft collars and you’re in business. We make two versions, one for our IG32 and IG42 motors and one for our IG52 motors. See the lists at the bottom of the post to make sure get everything you need to mount a motor, shaft, and a wheel. There are lists for each motor size.

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We use three different methods when it comes to mounting wheels on our robots and we use abbreviations in the robot names to indicate which method we use in that particular robot. The three abbreviations we use are DM (direct mount), SB (single bearing), and DB (dual bearing). Direct mount is the cheapest and easiest but should only be used for light duty payloads. The motor shaft takes all of the weight of the robot and any load applied to the robot. Single bearing is a much more robust design, where a ball bearing takes most of the load off of the motor shaft and puts it on the chassis/motor mount. The motor is still direct driving the wheel, however, so it will still take some of the load. The most robust system is the dual bearing system. In this, the wheel axle is mounted on two bearings and chain driven. This takes all of the load off of the motor and puts it on the chassis/motor mount. See below for an idea of load capacity for each size of motor and for each method. The motor mount tubes that we describe in this post use the SB method.

SDR Wheeled Robot Categories
Wheel/Axle
Mount Method
IG32
(32mm Motors)
IG42
(42mm Motors)
IG52
(52mm Motors)
DM (Direct Mount)10 lbs.
SB (Single Bearing)75 lbs.100 lbs.125 lbs.
DB (Dual Bearing)200 lbs.250 lbs.
*This is the maximum weight that the robot can handle. Please note that this weight varies widely upon the robot’s configuration and the surface on which it is driven. See our Support Pages for more information.

 

Instructions

First, mount the motor to the motor plate. Next mount the motor plate to the motor tube using either the motor plate hardware kit (IG32 and IG42) or the hardware that comes with the motor tube (IG52). Next, mount your wheel to the shaft using the hardware in the wheel. Slide a shaft collar, a bearing, and then another shaft collar (with the long set screw) onto the shaft, and then slide the wheel shaft onto the motor shaft. Push the bearing into the hole on the motor tube and press the shaft collar against it and tighten the set screw. Finally tighten the long set screw through the hole in the wheel shaft onto the motor shaft, making sure the set screw is tightened onto the center of the flat spot on the motor shaft. Make sure to use locktite on all screws so they don’t back out.

You can make a simple 2WD robot by using two of these motor tube assemblies, a caster, and a base plate (like we’ve done with our 2WD Robot kit). For the base plate, you can use aluminum, plywood, plastic, or whatever else you’d like. We’ve used aluminum for ours.

To complete your RC robot, you’ll need batteries, a motor controller, and an RC Controller. You might also want a battery charger. And don’t forget to check out our How to Build a Robot support page for more help.

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What to Buy

IG32:

Qty. 1 IG32 and IG42 Motor Tube
Qty. 1 IG32 Motor Mount Plate
Qty. 1 ½” Ball Bearing
Qty. 1 Pack of 16 M3x8mm Screws (enough to mount 4 motors)
Qty. 1 IG32 and IG42 Motor Plate Hardware Kit (enough to mount 4 motors)
Qty. 1 ½” Shaft collar
Qty. 1 ATR Wheel Shaft 6mm Bore – 6 inch Tire (with ½” lock collar and long set screw option)

One of the following wheels:
Qty. 1 6 inch pneumatic tire
Qty. 1 6 inch solid core tire

IG42:

Qty. 1 IG32 and IG42 Motor Tube
Qty. 1 IG42 Motor Mount Plate
Qty. 1 ½” Ball Bearing
Qty. 1 Pack of 16 M3x8mm Screws (enough to mount 4 motors)
Qty. 1 IG32 and IG42 Motor Plate Hardware Kit (enough to mount 4 motors)
Qty. 1 ½” Shaft collar

One of the following shafts:
Qty. 1 ATR Wheel Shaft 8mm Bore – 6 inch Tire (with ½” lock collar and long set screw option)
Qty. 1 ATR Wheel Shaft 8mm Bore – 10 inch Tire (with ½” lock collar and long set screw option)

One of the following wheels:
Qty. 1 6 inch pneumatic tire
Qty. 1 6 inch solid core tire
Qty. 1 10 inch pneumatic tire
Qty. 1 10 inch tiller tire

IG52:

Qty. 1 IG52 Motor Tube
Qty. 1 IG52 Motor Mount Plate
Qty. 1 5/8” Ball Bearing
Qty. 1 Pack of 16 M5x12mm Screws (enough to mount 4 motors)

Qty. 1 5/8” Shaft collar
Qty. 1 ATR Wheel Shaft 12mm Bore – 10 inch Tire (with 5/8” lock collar and long set screw)

One of the following wheels:
Qty. 1 10 inch pneumatic tire
Qty. 1 10 inch tiller tire

 

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