I used a 25 degree, 0.1mm tip engraving bit, they did brake from time to time but lowering the engraving speed helped a lot.
Removing the epoxy glue turned to be pretty easy. In the next attempt I used 2 component epoxy glue which worked excellent. I first tried to hold the coin down on the engraving table using double sided tape, but this didn't turn out to be a great idea because the lubricant used for the drill bit dissolved the double sided tape. I really would've never thought I would even reach 1K let alone 25K, so thank you very very much -) Since I just passes 25K subs I decided to do a little giveaway to show my appreciation to all of you. This can all be found in the YouTube video I made about the project. Next I switched to the actual coin and after a few hickups and fails I finally found the method to success. The first test I did was in some wood which turned out very nice. The generation of the toolpath and G-code is also done in Fusion 360. Next I used Fusion 360 to model the coin. I first faced the 2 sides of the 50 cent using my mini lathe. This machine needed a lot of work and tweaking.I just recently bought some new equipment (HBM mini lathe and a 3018 cnc-machine) and wanted to do a little project to test out the 2 machines and get familiar with them. So I decided to do a little bitcoin project. My recommendation is that if you had some more money, get a better machine to have a peace of mind about the hardware.
The linear sliding shaft are somewhat flimsy and won’t be able to mill aluminum correctly. To conclude: this machine did OK job for beginners who wanted to learn CAM but not for heavy duty uses or aluminum milling as advertised. The 3D carving test were also successful. Fusion 360 is pretty easy to use and free for hobbyist and definitely has 3D capabilities. That’s why I had to use AutoDesk Fusion 360 to generate the tooth-paths and G-code for a simple design of 3D smiley face. The thing I was most interested about was 3D carving. My first test run with a 2D smiley face using Easel from Inventables as G-code generator was successful. The machine came to me per-assembled but I needed to do a lot of tightening. It’s an used 3018 wood carving machine (small and light duty). I just bought my first CNC machine from eBay.
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