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Cylindrical Slide Rule

by Mortimer, published

Cylindrical Slide Rule by Mortimer Apr 11, 2013

Description

A printed version of a brass slide rule (that I keep in my car to calculate gas mileage) I made previously. I'm having trouble coming up with a good way to join them. Ideally, I'd like the joining to be done with one piece that still allows for a hole in the middle, like with the brass version, but I didn't like any of the ideas I came up with. Please help / derive.

Update: I came up with a center piece that I'm happy with. As I am currently CAD-less, my friend J. Ferrari did the CAD work for the center piece.

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I just created a thing

thingiverse.com/thing:73437

which is my concept for a core to join the two halves of this slide rule.
If you do that, then you're printing with support which won't leave a smooth surface and the pieces won't slide as well together. I also don't like having a lip that protrudes in the Z direction. If it's thin enough to snap together, it'll be likely to break along a layer boundary. But if you can come up with a good way to do it, I'd love to see it.
Wikipedia has an article that explains the use and history of the slide rule.

en.wikipedia.org/wiki/Slide_rule

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Instructions

The center piece is bent to fit in the center hole. The ends of that piece won't bend as easily by themselves, so I had to bend them a little with pliers. Also, it's designed to be printed with 0.25 mm layers.

I just created a thing

thingiverse.com/thing:73437

which is my concept for a core to join the two halves of this slide rule.
Slide Rule Core
Hello Mortimer,

How do you use this ? I've never seen something like that before.

For your request,

you might try to print a ring (1) 1mm thick whose external diameter corresponds to the internal diameter of your rings.

This ring than 2mm on each side.

After you could print two washers (2) with a form of "u" at the level of the ring (1)

I
I (2)
c -----(1)------ (2)
Wikipedia has an article that explains the use and history of the slide rule.

en.wikipedia.org/wiki/Slide_rule
you might try to open one hole on one half by, 1mm and adding a section to the other half for the first one to slide onto. you can add a lip to lock it on and its will only be 2 parts. and you can keep the hole in the center. i forget the correct terms but i hope you get the idea.
If you do that, then you're printing with support which won't leave a smooth surface and the pieces won't slide as well together. I also don't like having a lip that protrudes in the Z direction. If it's thin enough to snap together, it'll be likely to break along a layer boundary. But if you can come up with a good way to do it, I'd love to see it.
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