Helmet Mirror Mount: First Light

Printing went smoothly after two preliminary passes to work out the sizes and alignments; this is the second pass, which you can tell because the mirror shoulder has three supports instead of the two shown in the solid model:

Mirror mount parts on build plate

Mirror mount parts on build plate

One view of the parts, with the mirror shaft in place:

Mirror mount partial assembly - top

Mirror mount partial assembly - top

Another view, showing the bottom of the Elevation Plate with the recessed nut:

Mirror mount parts partial assembly - bottom

Mirror mount parts partial assembly - bottom

Assembling the two glue joints required an overnight clamping:

Mirror mount - glued and clamped

Mirror mount - glued and clamped

Then a layer of double-stick foam tape affixes it firmly to the helmet:

Mirror mount - on helmet

Mirror mount - on helmet

It’s a bit too big and way ugly, but works pretty much as expected.

Two lengths of heatshrink tubing now lock the mirror shaft sections in place; they tended to rotate slightly under normal vibration.

The OpenSCAD code and model have a few modifications from this object. The next one won’t have the third section of mirror shaft, which makes the shoulder and Az Mount smaller, and the Az Mount is 1 mm closer to the El Body. That shaves a few millimeters off the whole thing.

The mirror clamp out there on the end is much too large and has too many fiddly parts. I think a little printed doodad would work, but that’s in the nature of fine tuning.

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  1. #1 by Equinoxefr on 2011-07-01 - 08:26

    Hi,

    What kind of glue did you used for this plastic ?

    Great job !

    Regards

    Pierre

    • #2 by Ed on 2011-07-01 - 10:51

      What kind of glue

      It started out as Plastruct, which is mostly trichloromethane (aka chloroform). I’ve been adding acetone and MEK for long enough that I think the original contents are long gone; I keep it around because the jar has a nice brush in the cap that doesn’t dissolve.

      I have a few minor tweaks in the pipeline, but overall the mirrors are working great!

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