A different jigsaw was used which didn't cause debilitating hand cramping. The last time gears were cut by hand 72 teeth were cut and hand fatigue persisted for hours. This time 167 teeth were cut, with the same blade, and there was minimal hand fatigue. The difference was a saw which required a momentary switch to be held compared to a sliding switch which maintained contact.
Considerable scrap was generated during the process. Large pieces of plastic were saved if they could be made into small gears but a lot was thrown away if it was damaged or small. The repeated tooth cutting left a lot of plastic tabs strewn on the floor below the cutting area.
A special tool was made to aid in the tooth sanding. This device was modeled like a handsaw, with a large handle, and a cutting edge at the bottom, or top depending on orientation. Just like the blank wooden slate used earlier this has a 1/2" (12mm) piece of wood with sandpaper clamped to the side. Adding a handle should reduce hand fatigue. Scrap wood chosen for this tool was 1/4" (6mm) thick so it had to be doubled up, but only one side was doubled so the remaining side could become a thinner sanding tool for more precise work. The wood was glued together and clamped to dry.
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.
2016-09-09 (F)
Gears and 167 teeth
Considerable scrap was generated during the process. Large pieces of plastic were saved if they could be made into small gears but a lot was thrown away if it was damaged or small. The repeated tooth cutting left a lot of plastic tabs strewn on the floor below the cutting area.
Below the cutting area after cutting gears
A special tool was made to aid in the tooth sanding. This device was modeled like a handsaw, with a large handle, and a cutting edge at the bottom, or top depending on orientation. Just like the blank wooden slate used earlier this has a 1/2" (12mm) piece of wood with sandpaper clamped to the side. Adding a handle should reduce hand fatigue. Scrap wood chosen for this tool was 1/4" (6mm) thick so it had to be doubled up, but only one side was doubled so the remaining side could become a thinner sanding tool for more precise work. The wood was glued together and clamped to dry.
Tooth sanding tool
Downloads:
- Gears
- Panel layout PDF or DWG
- S Symbol Plate OpenSCAD source or STL model
- Ultrasonic flush mount source or STL
- 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.
2016-09-09 (F)
Comments
Post a Comment