New motors were selected to replace the underpowered 12V motors. The small motor may have been enough to drive the project but the homemade PVC gears were the cause of too much friction. The new motors were four times more expensive, not unreasonable, but significantly larger and more powerful.
The shaft on the new motor had threading, which looked like 1/4-20 but wasn’t a standard thread count. It was not metric either. When a suitable nut couldn’t be found a less orthodox solution was found. A 1/4” (6mm) ID nylon spacer was placed over the threads and a set-screw collar was used to crimp the spacer onto the threads without causing any damage. A fender washer was placed below the spacer and collar to keep them perpendicular to the shaft. This washer had to be drilled to 15/64” with a standard drill bit.
Mounting the motor will be a challenge. The small motor could be placed with minimal effort due to their size and low-torque. Additionally, they had mounting holes on the face while the new motors do not have that. Holes, threaded or smooth, can be added to the face of the new motors.
Downloads:
The rest of the posts for this project have been arranged by date.
First time here?
Completed projects from year 1.
Completed projects from year 2.
Completed projects from year 3.
Disclaimer for http://24hourengineer.blogspot.com/
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information in this blog, or linked by this blog, are not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on their post.
This blog, including pictures and text, is copyright to Brian McEvoy.
2016-11-11 (Th)
Comparison of the two motors
The shaft on the new motor had threading, which looked like 1/4-20 but wasn’t a standard thread count. It was not metric either. When a suitable nut couldn’t be found a less orthodox solution was found. A 1/4” (6mm) ID nylon spacer was placed over the threads and a set-screw collar was used to crimp the spacer onto the threads without causing any damage. A fender washer was placed below the spacer and collar to keep them perpendicular to the shaft. This washer had to be drilled to 15/64” with a standard drill bit.
Hardware store parts next to motor shaft
Spacer crimped onto shaft threads
Mounting the motor will be a challenge. The small motor could be placed with minimal effort due to their size and low-torque. Additionally, they had mounting holes on the face while the new motors do not have that. Holes, threaded or smooth, can be added to the face of the new motors.
Possible arrangement for motor mounting
Downloads:
- Gears
- Panel layout PDF or DWG
- S Symbol Plate OpenSCAD source or STL model
- Ultrasonic flush-mount source or STL
- Internal ring gear
- Spring hub includes source and STL for metric and imperial
- 1 Small Arduino Micro
- 2 Stereo potentiometers (10K)
- 4 Multi-turn potentiometers (10K)
- 2 Twelve volt DC motors
- 1 Dual H-bridge
- 2 Ultrasonic distance sensors
- 1 Sine wave generator or the Amazon version
- 1 Voltage Regulator
- 1 Twelve volt three amp power supply
The rest of the posts for this project have been arranged by date.
First time here?
Completed projects from year 1.
Completed projects from year 2.
Completed projects from year 3.
Disclaimer for http://24hourengineer.blogspot.com/
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information in this blog, or linked by this blog, are not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on their post.
This blog, including pictures and text, is copyright to Brian McEvoy.
2016-11-11 (Th)
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