Ball bearings are often installed by placing one on each side of a hub so weight is distributed across both bearings and tension from the sides on the axle keeps them in place. If a bearing is secured in place it is possible to get away with only one bearing if the load is small enough. There are other situations of course.
While thinking about a convenient way to use 608ZZ bearings it occurred that it would be easy to print a hub with built-in shock absorbers that would allow some tension to be applied between the gears so imperfections would not cause the gears to slip as much.
A quick design was sketched which was basically a wheel with curved spokes. Not a novel idea but simple enough to create with OpenSCAD and very versatile.
OpenSCAD was used to create a parametric model. The parameters which a user can modify are illustrated below. Each of the changes can be made independently but some parameters can exceed the limits of other so when making changes it's important to make them one at a time unless the final dimensions have already been calculated.
For the Clockwork Theremin, a 5" (127mm) hub will be printed. This is the size of a data disc like a CD or Blu-Ray disc.
A print was made but three different sized spur gears were printed since the final gear ratio hasn't been decided. Having three choices, or more if they are printed, should give a good product with suitable speed and enough power to turn the heavy gears.
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.
2016-09-14 (W)
While thinking about a convenient way to use 608ZZ bearings it occurred that it would be easy to print a hub with built-in shock absorbers that would allow some tension to be applied between the gears so imperfections would not cause the gears to slip as much.
A quick design was sketched which was basically a wheel with curved spokes. Not a novel idea but simple enough to create with OpenSCAD and very versatile.
Sketch of spoked wheel hub
OpenSCAD was used to create a parametric model. The parameters which a user can modify are illustrated below. Each of the changes can be made independently but some parameters can exceed the limits of other so when making changes it's important to make them one at a time unless the final dimensions have already been calculated.
For the Clockwork Theremin, a 5" (127mm) hub will be printed. This is the size of a data disc like a CD or Blu-Ray disc.
Possible changes that can be made to the parametric model
A print was made but three different sized spur gears were printed since the final gear ratio hasn't been decided. Having three choices, or more if they are printed, should give a good product with suitable speed and enough power to turn the heavy gears.
Spur gears and internal threaded gear
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.
2016-09-14 (W)
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