My wife asked people to make her something for her birthday. It could be naming a character after her in their current video game, or writing her into a story they were working on. I opted to create a coin honoring her. The front has her name, online handle, a double helix, and the periodic table entries for Carbon and Silicon. The back has the chemical symbol for caffeine, which matches the solo tattoo on her shoulder. I drew the graphics in QCAD and extruded them to make them pop up from the surface of a flat disc. I also created the ridges along the edge in OpenSCAD as half-cylinders, a little more fidget-worthy than small dimples you would find on a typical piece of currency.
The rest of the project will be about learning how to cast the coin in metal. My initial plan was to carve one face into graphite and melt metal into it, but it would be single-sided. I changed to the sand-casting method based on a 3D-printed coin. I ordered a two-part mold frame, sand, metal blanks, and a melting pot.
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
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
Completed projects from year 12
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.
2025-12-29
The rest of the project will be about learning how to cast the coin in metal. My initial plan was to carve one face into graphite and melt metal into it, but it would be single-sided. I changed to the sand-casting method based on a 3D-printed coin. I ordered a two-part mold frame, sand, metal blanks, and a melting pot.
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| Spinning coin |
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
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
Completed projects from year 12
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.
2025-12-29
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