Sunday, November 24, 2013

Head Drawing

The idea is to put the scales on, hold the square to them and snug them up. Then the rules can be adjusted for parallelism with the axes with a reference point on the board and the thumbscrew on the bottom. The hinge part allows work up to about 1cm thick. I keep imagining using a dial indicator to true the rules, but some things you don't want to know. I'll probably just tape a stick to the board.

There's a little screw on the bottom (I forgot to draw in) which will make sure the rules aren't canted up off the board by the weight of the hinge. I worry that it might want to catch or drag on the paper, so I will put masking tape over it if I have to. See, tape is already a theme and I haven't even built it yet.

The parallelism adjustment thumb screw is sitting in spherical washers. So I can sleep at night.

There are two stainless ball knobs. The big one on the left locks the Y axis; the small one on the right locks the parallelism. I don't think there will be a lock for the X axis, since it will be sticky enough as-is.

I can feel the late hours filing already... two A.M., the awkward space in the notch by the top is looking back at me, and I'm wishing I would have used 303 instead of 304 stainless.

Update: "Machinable" 304 SS, what I used, isn't half bad. It does seem to work harden a little bit, but it only got in the way of the jeweler's saw. Stick wax lubricant helped with the hacksaw. Sawing 1/4" plate is not typical jeweler's saw work anyway.

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