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MechEngineerMike

Geneva Roller Ruler, Pocket Sized Infinite Ruler

by MechEngineerMike Mar 29, 2019
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Printed well (thanks for the orientation tip Mike) and after cranking some spare 3mm screws into the as-printed holes it seems to work great! However, after using it for a minute I am wishing the labeling on Geneva gear went from 0-4 instead of 1-5.

ahh makes sense, thanks for the feedback!

How about a Geneva gear w/ 10 slots instead of 5? Geometrically speaking a little tricky, I'd imagine...

Another thought- instead of labeling the wheels as they are, simply labeling them with 0-3 inches (or however many centimeters) would also be helpful, as I have a hard time keeping track of which tick-mark on the wheel corresponds to which inch. I'm sure I'll make a convention, but some indicators might help future users. I imagine plenty of people will print this, it works quite well!

How does the clip print without supports as oriented?

reorient it by rolling it over 90 deg.

I made this and I love the design. There is only one issue, as far as I can see. When I use mine on shiny surfaces, the wheel slips. Would it be possible to make a channel in the centre of the wheel, so that you can pull on a rubber O ring? That would make the design absolutely perfect. And it would work on all surfaces.

Awesome! Yes slippery surfaces like glass can be an issue for a freshly printed one but I have discovered a way to make them really free spinning and I do it on all the ones I sell. I drill out all the holes, deburr, use a file on the holder's touch surfaces, and break in the assembly by manually rolling it back and forth hard on a carpet and it works great! A rubber o ring would be ideal of course but I didnt want to add any more vitamins and Id have to standardize it so the circumference is controlled. As it is Im working on like 6 other new toys so since this works well enough ive let it be.

I definitely like tho O-Ring idea, since I have the same problem (use it daily building swimmingpools). O-Rings are standardized, so it would be quit easy to buy them world wide. If you should ever find the time to get that done (or someone else!), that would be just great!

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