Experimenting with the miniature version of the theremin made it quite clear that driving a large gear directly from the motor was a poor choice. This was supposed to be a 200mm gear but that would likely prove unworkable.
An internal ring gear [convenient list of gear types] was the easiest choice since it could be hidden under the 200mm gear. This type of gear uses teeth on the inside of a cylinder and can be driven by a regular spur gear from the inside. Rather than research the intricacies of this gear, an existing model was found on Thingiverse by Jag. His planetary gear reducer was downloaded and the OpenSCAD files were modified to produce an isolated internal ring gear.
Before printing, the model was changed from the one shown above to one with mounting holes and a solid bottom. The purpose of the solid back was so that the small gear would not catch on the spokes. The mounting holes were placed beyond the rim of the gear so no screws would be inside because that could also cause the gears to snag.
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.
2016-09-13 (Tu)
An internal ring gear [convenient list of gear types] was the easiest choice since it could be hidden under the 200mm gear. This type of gear uses teeth on the inside of a cylinder and can be driven by a regular spur gear from the inside. Rather than research the intricacies of this gear, an existing model was found on Thingiverse by Jag. His planetary gear reducer was downloaded and the OpenSCAD files were modified to produce an isolated internal ring gear.
Model of internal ring gear
Before printing, the model was changed from the one shown above to one with mounting holes and a solid bottom. The purpose of the solid back was so that the small gear would not catch on the spokes. The mounting holes were placed beyond the rim of the gear so no screws would be inside because that could also cause the gears to snag.
Downloads:
- Gears
- Panel layout PDF or DWG
- S Symbol Plate OpenSCAD source or STL model
- Ultrasonic flush mount source or STL
- Internal ring gear
- 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.
2016-09-13 (Tu)
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