The servo display

Post date: Feb 27, 2016 2:45:41 AM

My original idea was to use a brass barometer (as shown below) that i have in the restaurant and which is pretty useless on the equator due to the barometric tide and the absence of low pressure and high pressure system in the intertropical convergence zone ITCZ

But it was impossible to scavenge it without damaging the casing so i quickly gave with that idea.

Instead i'm using blank DVD box as a body and transparent CD like disk that you can find in the CD box as graduation plate and transparent top protection. Some nylon spacer to assemble everything together.

I glue the servos on the bottom plate. the orientation of the servo doesn't really matter because you can always turn the servo horn on the servo head to match the graduation.

I scavenge the needle from a broken Amp meter for the long one and from a broken diving depth gauge for the smaller one. I have glued with cyanolit the needle directly on the servo horn.

For the graduation i use the sketchup software to print the graduation on a transparent printable sticker sheet. Underneath the graduated transparent sheet i have stick a blank sticker sheet pre-cut at the CD disk dimension. Then i have drilled the 3 3mm holes for the spacer and two 6.5mm hole for the two bottom servo head.

See attached file bellow for the sketchup file.

Sketchup is a fantastic software except when you have to print at 1:1 scale. the print process at full scale is little bit tricky and ask me lot of try before i can print out full scale on my transparent sticker sheet.

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