### Author Topic: Help on robot motor and wheel  (Read 826 times)

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#### MC

• Jr. Member
• Posts: 16
##### Help on robot motor and wheel
« on: July 25, 2011, 01:41:03 AM »
Hi

I am trying to build a robot using three wheels and only one main wheel in front and rest two free wheal in the rear
The robot is used to pick to move around with some load on it
I was going through a supplier datasheet and they asked we the robot weight when it is loaded and unloaded(that can be done by adding/subtracting the weight of the load to the robot weight )
Are the two things different or how do i specify the wheel loaded and unloaded weight?

Regards,
MC

#### waltr

• Supreme Robot
• Posts: 1,944
##### Re: Help on robot motor and wheel
« Reply #1 on: July 25, 2011, 08:57:26 AM »
Quote
Are the two things different or how do i specify the wheel loaded and unloaded weight?

Yes they are different. Unloaded is the total weight of just the Robot (frame, wheels, batteries, motors circuits). Loaded is the Robot total weight PLUS the weight of what ever it is carrying.

This is also known as the Unloaded and Gross weight.

#### Soeren

• Supreme Robot
• Posts: 4,672
##### Re: Help on robot motor and wheel
« Reply #2 on: July 25, 2011, 03:16:07 PM »
Hi,

[...] the robot weight when it is loaded and unloaded(that can be done by adding/subtracting the weight of the load to the robot weight )
Are the two things different [...]
Yes, the robot weight is the entire robot, while the wheel load depends on how many wheels and how the weight distributes over each.

Say you have a 4 wheeled robot with the load centrally placed - the wheel load will then simply be the total divided by 4.

If the load on your 3 wheels are equally distributed, you divide the total by 3 of course, but chances are, that the load on the rear wheels are different from the front wheel.

For selecting a wheel, only the wheel load is needed.
« Last Edit: July 25, 2011, 03:17:22 PM by Soeren »
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?