The Smell of Molten Projects in the Morning

Ed Nisley's Blog: Shop notes, electronics, firmware, machinery, 3D printing, laser cuttery, and curiosities. Contents: 100% human thinking, 0% AI slop.

The New Hotness

  • Tek CC Milled Cursor: MVP

    What a difference 100 µm can make:

    Hairline V tool tests - 0.3 mm 10 kRPM 24 ipm
    Hairline V tool tests – 0.3 mm 10 kRPM 24 ipm

    All three hairlines have 0.3 mm depth of cut, with the spindle running at 10 kRPM and the cut proceeding at 24 inch/min = 600 mm/min. All three cuts went through a strip of water + detergent along their length, which seems to work perfectly.

    The cuts start on the left side:

    Hairline V tool tests - 0.3 mm 10 kRPM 24 ipm - start
    Hairline V tool tests – 0.3 mm 10 kRPM 24 ipm – start

    I cut the red hairline through the PET cursor’s protective film to confirm doing it that way is a Bad Idea™; the gnarly appearance is sufficient proof.

    The cuts end on the right:

    Hairline V tool tests - 0.3 mm 10 kRPM 24 ipm - end
    Hairline V tool tests – 0.3 mm 10 kRPM 24 ipm – end

    Eyeballometrically, the cuts are the same depth on both ends, with a slight texture difference at the start as the X axis ramps up to full speed.

    They’d be a bit stout on an old-school engraved slide rule, but look just fine laid against a laser-printed Homage Tek Circuit Computer:

    Hairline V tool tests - 0.3 mm 10 kRPM 24 ipm - Tek CC
    Hairline V tool tests – 0.3 mm 10 kRPM 24 ipm – Tek CC

    Flushed with success, here’s a fresh-cut red hairline in action:

    Tek CC cursor hairline - V tool red fill
    Tek CC cursor hairline – V tool red fill

    The end of the cursor sticks out 1 mm over the rim of the bottom deck, because I wanted to find out whether that would make it easier to move. It turns out the good folks at Tek knew what they were doing; a too-long cursor buckles too easily.

    The trick will be touching off the V tool accurately enough on the cursor surface to get the correct depth of cut. The classic machinist’s technique involves a pack of rolling papers, which might be coming back into fashion here in NY.