For this homework, I chose to CNC machine a Longhorn for the same reasons stated in my metal cutting and post-processing blog post. I downloaded the STL file of a Longhorn from the Noun Project website and used Carbide Create to set the machine path. I had two pocket cuts inserted into this piece. I proceeded to cut my two pieces out using the CNC machine.
After cutting out the two pieces, I sanded them to remove the rough edges left by the cutting process. However, some rough edges remained in the pocket cuts that were inaccessible with regular sandpaper, so I used a Dremel to smooth those areas.
I proceeded to stain after this. The final piece is seen below.
Cost analysis:
Cost Type | Cost | Price | Source | Quantity | Total |
Materials | 3/4 in. x 4 in. x 8 ft. Cedar Board | $9.87 | Home Depot | 1 ft/8ft | $1.24 |
Sand Paper orbital (15 pack)
Sand paper sheets (24 pack, assorted) |
$9.97
$20.59 |
Home Depot
Home Depot |
~1/15
~2/24 |
$0.67
$1.72 |
|
Wood stain | $12.98 | Home Depot | ~0.25 qt | $3.25 | |
Labor | CNC machine Operator | $23/hr | ZipRecruiter | 1.5 hours | $34.5 |
Prototyping Engineer | $30.5/hr | Indeed.com | 1 hour | $30.5 | |
Overhead | Facility Cost (Machine Time) | $40/month | The MakerBarn | 1 month | $40 |
Total: $110.64