How to Modify a Servo Motor for Continuous Rotation ( One Motor Walker Robot )

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Introduction: How to Modify a Servo Motor for Continuous Rotation ( One Motor Walker Robot )

This instructable is part of the one motor walker.
https://www.instructables.com/id/How-to-build-the-one-motor-walker/

There are trillions of tutorial like this, I know :-)

They where taking at school during lunch break with a Sony Mavica camera ( floppy disk )!
5 febuary 2001, 12:18:50

Step 1: How to Modify a Servo Motor for Continuous Rotation ( One Motor Walker Robot )

The recommended tools for this project:
1 x safety glasses!!
1 x soldering iron
1 x desoldering pump
1 x wire strippers
1 x side cutter
1 x scissors, knife, x-acto, etc

You will need a set of screw driver to remove the four screws on the back of the servo.

Step 2: How to Modify a Servo Motor for Continuous Rotation ( One Motor Walker Robot )

I put a peace of tape so the gear box does not come appart when I remove the back cover.

Step 3: How to Modify a Servo Motor for Continuous Rotation ( One Motor Walker Robot )

Remove the back cover by removing four screws.

Step 4: How to Modify a Servo Motor for Continuous Rotation ( One Motor Walker Robot )

If you use a solder pump, it will be easy to desolder.

Step 5: How to Modify a Servo Motor for Continuous Rotation ( One Motor Walker Robot )

Be sure you have remove every solder before starting lifting.

When you are sure, take a flat screw driver to lift it.

Step 6: How to Modify a Servo Motor for Continuous Rotation ( One Motor Walker Robot )

Solder long wire to the motor.

Use the original servo wire. Remove the white wire.

Step 7: How to Modify a Servo Motor for Continuous Rotation ( One Motor Walker Robot )

This is the inside of the gear box.

Step 8: How to Modify a Servo Motor for Continuous Rotation ( One Motor Walker Robot )

After some thinking, I realise that you don't need to cut the tap for the one motor walker.
If you want to build the one motor walker, I suggest you try the to build the robot without cutting the tap.If you want to make a rolling robot by using servo motors for the locomotion then cut the tap.

To cut the tap please read carefully.

Warning!

I have already broken the entire gear by using a side cutter. I was sort of piss off!
I recommend you be carefull and use a hacksaw.

Take your time!

Put every thing back together and you have finish!
You can put some new grease it the gearbox if you want.

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79 Comments

If you would have replaced the existing potentiometer with a micro 5k potentiometer and centered it (google it ;) ) in addition to removing the limiting pin, you would have a "positionable" 360 degree servo motor that can be used with any device that will drive a standard servo and also used where a "stepper motor" can not at times due to space constraints... Like a small miniature robot crawler where even a NEMA 8 stepper is a bit large? Had that headache more then once! :)

Keep up the good work. Looking forward to seeing more. :)

if you follow this instructable and remove all electronics, you simply apply 5V directly to the motor and it will spin continuously.

If you modify it for continuous motion can you still get the servo to return to its original position? I can get it to move with a flex sensor but once i stop it will not return to its original position before it was modified. Help

so there is no pulse pin instead you program it like a dc motor but no motor driver right

yes, no pulse pin.

It's a DC motor. You use it like any motor.
Depending of your application you will need a motordriver to control it.
It's call an H-bridge for example.

Can a servo make continuous rotation very acuurately (say 533 degrees 56 ' 00")

no, get yourself a stepper motor.

cna i also know the acuurate position of the motor after movt??

a servo motor returns back to it's orginal position, ya? this is the EXACT same thing, but without the tab, so you can keep turning whatever it is you are turning before returning back to it's normal position.

remember that the potentiometer inside the servo motor is not design to turn more then 1 turn. He wanted to turn 533deg. A winch servo motor could work since they turn more then 360deg.