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

  • Tailor’s Clapper: Laser-Cut Woodwork

    Creating the rounded-rectangle shape of a tailor’s clapper in LightBurn, then cutting it out, doesn’t pose much of a challenge:

    Ironing weight - cutting oak plank
    Ironing weight – cutting oak plank

    That was a prototype cut from an oak plank with some fairly obvious splits. It turned out OK, but ¾ inch oak is obviously right at the limit of my 60 W laser’s abilities:

    Ironing weight - laser cut edges
    Ironing weight – laser cut edges

    The “production” clappers came from a nicer plank that was just barely long enough:

    Ironing weight - laser cuts - top
    Ironing weight – laser cuts – top

    The cut, at 2 mm/s and 70% power, just barely penetrates the plank:

    Ironing weight - laser cuts - bottom
    Ironing weight – laser cuts – bottom

    Unlike the top picture, I put the plank on the knife-edge supports, resulting in the small charred lines perpendicular to the cut.

    The edges came out thoroughly charred:

    Ironing weight - laser cuts - edges
    Ironing weight – laser cuts – edges

    Spread yellow wood glue smoothly on one piece, stick another to it, then align and clamp:

    Ironing weight - clamping
    Ironing weight – clamping

    I offset the cut 1 mm outside the nominal shape to allow Mr Belt Sander to remove the char while reducing the block to size. Obviously, there is no real tolerance, other than that it must fit Mary’s hand, and they all came out nice and straight.

    Some of the char seems embedded deep in the wood grain and leaves a dark mark despite removing the extra millimeter:

    Ironing weight - seam ironing B
    Ironing weight – seam ironing B

    Contrary to what I feared, the characteristic wood-stove odor dissipated after a day or two: they’re entirely inoffensive. Which was fortunate, as the slightest odor would cause them to fail incoming inspection.

    The longer weight on the far left came from a plank with a conspicuous knot on one end. The stress from supporting that branch while the tree grew apparently made the wood much denser, as the same 2 mm/s 70% cut setting barely made it halfway through the plank. I finished the job by cutting the outline with Tiny Bandsaw™, which didn’t proceed any faster than the laser and left a much less uniform path for Mr Belt Sander.

    I’d definitely consider making any future tailor’s clappers by laminating three half-inch oak planks that would be much easier to cut, but my woodpile doesn’t have anything like that.

    The wood remains unfinished, as part of its job is to absorb moisture from steam-ironed fabric (which is not happening in the photo). Applying stains / sealers / finishes would definitely improve the wood’s appearance, but wreck its performance. Around here, function always outweighs form.