A custom spoked hub was printed to match the gear. Since the size of the hole saw couldn't be changed, it was necessary to change the size of the part. This was the opposite of conventional design where the cut would be made differently to accommodate the part. In a way, 3D printing has kind of turned that aspect of design on its head.
Very short screws were purchased from a local hardware store. The screws were #2 (1.5mm) and 1/4" (6mm) long. Twelve screws were purchased since two hubs would be installed and each hub used six screws. The number of screw holes was programmed to match the number of spokes. If desired, the hubs could have been printed with any number of screws or spokes but six seemed reasonable at the time. Matching the number of spokes to the number of screw holes also had the benefit of attaching a screw at the termination point of a spoke for maximized stability.
Working with the miniature screws was difficult. They were prone to slipping and bouncing into unwelcome places. The ring finger magnet was a huge convenience when picking up and handling the screws.
Utility finger magnet
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.
2016-10-21 (F)
Spoked hub with no wiggle room
Very short screws were purchased from a local hardware store. The screws were #2 (1.5mm) and 1/4" (6mm) long. Twelve screws were purchased since two hubs would be installed and each hub used six screws. The number of screw holes was programmed to match the number of spokes. If desired, the hubs could have been printed with any number of screws or spokes but six seemed reasonable at the time. Matching the number of spokes to the number of screw holes also had the benefit of attaching a screw at the termination point of a spoke for maximized stability.
Underside of installed hub
Working with the miniature screws was difficult. They were prone to slipping and bouncing into unwelcome places. The ring finger magnet was a huge convenience when picking up and handling the screws.
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.
2016-10-21 (F)
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