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MPCNC Vinyl Cutting: First Cuts

It somehow seemed appropriate to use the standard MPCNC Crown drawing for the first vinyl cutting test:

0102

0102

That’s a PNG converted from the SVG original, because WordPress regards SVG and DXF files as security risks.

Run the DXF through dxf2gcode (from the Ubuntu repository) to produce G-Code suitable for my MPCNC’s GRBL controller, tape a sheet of paper to a sacrificial acrylic sheet, fire up bCNC, set the origins, and run the G-Code:

First Paper Crown - test cut

First Paper Crown – test cut

As expected, the cut paper pulled off the acrylic, because it’s not glued down; I have some Cricut adhesive cutting mats which are definitely in the nature of fine tuning. In any event, the paper showed I could get from a DXF image to drag knife cutting action.

This being a crown, gaudy gold vinyl seemed appropriate:

First Vinyl Crown - weeding

First Vinyl Crown – weeding

The weeding process removes everything that’s not the crown; I used a razor knife to cut a square and remove the vinyl around the crown. A good needle-nose tweezer works wonders!

Apply transfer film to the weeded crown and peel it from its backing paper:

First Vinyl Crown - transfer film

First Vinyl Crown – transfer film

Stick it on something desperately in need of decoration and peel off the transfer film:

MPCNC Vinyl Cutting - crown on mug

MPCNC Vinyl Cutting – crown on mug

The tricky part is setting the drag knife cutting depth to match the vinyl sheet thickness (14 mil = 0.36 mm), so the blade cuts the vinyl without cutting through the backing paper. This seems best done with manual trial cuts on scrap vinyl, pressing the drag knife holder down firmly by hand and tweaking the depth adjustment for a clean cut.

The G-Code cuts at 400 mm/min = 6.7 mm/s, perhaps a bit on the slow side.

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  1. #1 by Jason Doege on 2018-10-30 - 09:21

    Hackaday had a recent post on using this on adhesive copper sheet to make printed circuit boards. Sounded like a painful process to me but at least, no chemicals.

    • #2 by Ed on 2018-10-30 - 09:53

      For the record: Copper tape synth

      Laying out conductors using narrow copper tape makes much more sense than what I imagined: drag-knifing a big sheet of copper foil like it was vinyl film!

      • #3 by Jason Doege on 2018-10-30 - 12:20

        • #4 by Ed on 2018-10-30 - 15:49

          Wow! Much better than I expected!

          I have a 2 inch roll of 1.5 mil copper tape which feels like armor plate compared to 14 mil vinyl.

          A quick eBay check shows copper gilding foil (some labeled “edible” which I straight up do not trust) of unknown thickness. For 2.50/100 sheets, it can’t possibly be very thick and I’m not sure it’s even copper.

          Thanks for the suggestion!

      • #5 by Jason Doege on 2018-10-30 - 12:21

        And, I agree about the tape. Probably makes more sense. But, you never know until you try. Or, maybe past generalized experience means you do “know” but are still sometimes subject to occasional surprise.

  1. MPCNC Vinyl Cutting: Squidwrench Logo | The Smell of Molten Projects in the Morning

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