Radius Gauge for Clarke Precision Digital Vernier Calipers and similar types
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Circles are easy, just slap a caliper across the diameter! This is for when you've got part of a circle like a corner.
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If you draw a circle on an x/y plot touching both axes, the distance from the origin to the centre of the circle is R+L, with L being the distance between the origin and the nearest point on the circle, and R is the radius.
With a bit of Pythagoras and rationalisation, it turns out that R=L/(√2 - 1) which is the same as R=2.414 x L
So you put the item you want to radius, into the right angle, move the depth gauge until it reaches the item, read off the display, multiply by 2.414, and that's the radius. Easy!
Printed with 0.2mm layers, 60mm/s, PLA+ is fine.
Standard slicing for everything really, except you'll need “support everywhere” just to get the little overhang over the depth gauge exit nicely supported and that'll break out easily afterwards leaving a clean print.
It'll be interesting to hear which other brands of caliper this fits! Make sure the caliper is fully seated flat in the printed piece, I had to just knife-retouch the edge of the deep box area nearest the nearby magnet to get it to pop into place, and then it was just right.
I considered putting the formula on the arms like the other designs, but with a 0.4mm nozzle I find text that size tends to be hard to read, so I just printed out the formula on a bit of paper and stuck it in the deepest hole :o)
Hope you find this useful. Please hit the like button if it works for you!
PLEASE NOTE that the magnet holes are for what I had handy, 10mm x 2.5mm. If using thinner than 2.5mm you can shim the hole or tweak the design file. Smaller than 10mm will just mean a bit more glue or again tweak the design file.