I designed some extra-springy spoke patterns in case the flexible printer resin was too stiff. These patterns were based on the techniques I used for laser-cutting compliant mechanisms from plywood in the MKII versions.
The flexible printer resin's performance was mixed. The print was more pliant than expected, which was exciting, but it was fragile and prone to tearing. I assembled a spinner with a mostly intact top, and it dropped approximately 3 millimeters and would not fit into the shell.
I played with the prints and decided to continue with a four-spoke design. To account for the drooping, I lowered the axle holder and spokes by 3 millimeters. I made a second version with spokes four times thicker.
The spinner kept hitting the walls, but now it can swing on flexible spokes. I added height and width to the shell, giving ample space to work inside. I will shrink it back when I know how much I need.
I ground some divots into the threaded ends of M4 hardware with two power tools. I held the bolts in a drill's chuck and spun it slowly. I used a rotary tool with a rounded cutting bit to make the hole.
I printed the shell and installed brass hardware. The thin spoked spinner was too floppy inside, while the thick one was easier to control. As long as I am close to this scale, I should be able to model a usable spinner.
The rest of the summary posts have been arranged by date.
First time here?
Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8
Completed projects from year 9
Completed projects from year 10
Completed projects from year 11
Disclaimer for http://24hourengineer.blogspot.com and 24HourEngineer.com
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information on this blog, or linked by this blog, is 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.
 |
| 3-spoke and 4-spoke designs |
The flexible printer resin's performance was mixed. The print was more pliant than expected, which was exciting, but it was fragile and prone to tearing. I assembled a spinner with a mostly intact top, and it dropped approximately 3 millimeters and would not fit into the shell.
 |
| Spinner droop |
I played with the prints and decided to continue with a four-spoke design. To account for the drooping, I lowered the axle holder and spokes by 3 millimeters. I made a second version with spokes four times thicker.
 |
| Thicker spokes and 3 millimeter offset |
The spinner kept hitting the walls, but now it can swing on flexible spokes. I added height and width to the shell, giving ample space to work inside. I will shrink it back when I know how much I need.
 |
| Making the shell taller and wider |
I ground some divots into the threaded ends of M4 hardware with two power tools. I held the bolts in a drill's chuck and spun it slowly. I used a rotary tool with a rounded cutting bit to make the hole.
 |
| Making divots in brass hardware with two power tools |
I printed the shell and installed brass hardware. The thin spoked spinner was too floppy inside, while the thick one was easier to control. As long as I am close to this scale, I should be able to model a usable spinner.
 |
| All these tuned parts together |
The rest of the summary posts have been arranged by date.
First time here?
Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8
Completed projects from year 9
Completed projects from year 10
Completed projects from year 11
Disclaimer for http://24hourengineer.blogspot.com and 24HourEngineer.com
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information on this blog, or linked by this blog, is 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.
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