I’d really appreciate any advice on how to engrave copper bracelets with various designs.
I use C101 grade copper blanks 170 mm long x 10 mm wide x 2 mm thick with a 5 mm y radius at each end. I have these cut by a laser firm and order them by the 100’s. These arrive as flat blanks and they are bent to shape later on in the manufacturing process.
I’m no milling expert and my workflow is currently inkscape/svg --> carbide create --> carbide motion. I only need a 0.2 mm to 0.3 mm engrave depth so I find a 101 ball does the job just fine if I reduce the stepover to 0.35. To keep the blanks held securely in place during the engrave I had a ply jig made that is screwed on top of the nomad 883 mdf table. The jig holds 8 blanks. The jig is 3.2 mm thick so each blank rests slightly underneath the ply.
When it works the results are excellent. However there are imperfections in the blanks, e.g, small bends and warps. Even when carefully checked these may be hard to see with the naked eye. For blanks with imperfections they vibrate slightly during engraving which ruins the design resolution and leads to a distinct variability in engraving depth. As things stand, the error rate is too high to make the machine commercially viable.
If anyone has any suggestions on how to solve my problem I’d be very grateful.