I just had my first go at engraving some dual layer sign material, not sure of it's technical name.
I'm very new to cnc so I'm learning as I go.
First I should mention it was trialled on a cnc router, using a 30deg. conical engraving bit with a flat 0.1 end. The router I used has a minimum speed of 11,500 rpm. unloaded. Feed Rate was around 600 mm/min.
Anyhow as expected it was flop. The plastic quickly melted onto the cutting tip.
I couldn't slow the router any more so I tried a water/detergent spray on to the cutter to help cool it down, but also without success.
Can anyone offer some tips on engraving this type of material, or a link to a good source of relevant info.
Thanks.