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Curta I 3D CAD data
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Sebastian



Joined: 11 May 2014
Posts: 32
Location: Germany

PostPosted: Sat Mar 18, 2017 11:28 am    Post subject: Reply with quote

Hello Mr Smith,

this data could be used as base for 3D printing, but it would need to be modified and scaled up, because printing a working 1:1 Curta woun't work.
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mwu



Joined: 05 May 2015
Posts: 20
Location: SC, USA

PostPosted: Fri May 19, 2017 10:53 am    Post subject: Reply with quote

MrSmith wrote:
Dumb question, but is this used for 3D printing a Curta Calculator?

I've seen that on youtube:

https://www.youtube.com/watch?v=mG4A3R4imnc


The models I used for 3d printing it are public on onshape
The actual stl files, tools, parts, build manual are up on thingiverse

Sebastian, I found a few inconsistencies in the engineering drawings when modeling that I had to correct for a working Curta. Did you notice any?
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MrSmith



Joined: 28 May 2012
Posts: 17
Location: Australia

PostPosted: Fri May 26, 2017 10:34 pm    Post subject: Reply with quote

Sebastian wrote:
Hello Mr Smith,

this data could be used as base for 3D printing, but it would need to be modified and scaled up, because printing a working 1:1 Curta woun't work.


Can I ask why you couldn't print a 1:1 scale Curta?

thanks
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mwu



Joined: 05 May 2015
Posts: 20
Location: SC, USA

PostPosted: Sat May 27, 2017 8:49 pm    Post subject: Reply with quote

MrSmith wrote:
Sebastian wrote:
Hello Mr Smith,

this data could be used as base for 3D printing, but it would need to be modified and scaled up, because printing a working 1:1 Curta woun't work.


Can I ask why you couldn't print a 1:1 scale Curta?

thanks


I ran a few tests at 1:1 using shapeways. The parts I ordered came out way too weak to function. In fact, I had to work around some strength issues even at 3:1 scale to get a functional device.

I had to thicken the spider spring and the spring that pops the step drum between addition and subtraction. I also printed all of the pins and the support columns horizontally. The printer layers plastic up so the z-axis is the weakest. Printing those horizontally allowed them to withstand more stress along their length.

A 1:1 Curta would probably mostly require the same materials the Curta was originally produced with. There are a few exceptions, but mostly on the external non-mechanical parts. The interior mechanical parts are closer to watchmaking work than normal machining /manufacturing.
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MrSmith



Joined: 28 May 2012
Posts: 17
Location: Australia

PostPosted: Sun Jun 04, 2017 10:56 pm    Post subject: Reply with quote

makes perfect sense, thank you
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eteson



Joined: 28 Jun 2017
Posts: 14

PostPosted: Sun Jul 02, 2017 1:02 pm    Post subject: Reply with quote

what amazing work!
Congrats and thanks for sharing it!
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Eliseo
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