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Sebastian
Joined: 11 May 2014
Posts: 42
Location: Germany
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 Posted: Sat Mar 18, 2017 11:28 am Post subject: |
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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: 39
Location: SC, USA
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| Posted: Fri May 19, 2017 10:53 am Post subject: |
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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: 19
Location: Australia
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| Posted: Fri May 26, 2017 10:34 pm Post subject: |
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| 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: 39
Location: SC, USA
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| Posted: Sat May 27, 2017 8:49 pm Post subject: |
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| 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: 19
Location: Australia
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| Posted: Sun Jun 04, 2017 10:56 pm Post subject: |
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| makes perfect sense, thank you |
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eteson
Joined: 28 Jun 2017
Posts: 23
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| Posted: Sun Jul 02, 2017 1:02 pm Post subject: |
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what amazing work!
Congrats and thanks for sharing it!
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Eliseo |
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moxzero
Joined: 22 Jan 2015
Posts: 4
Location: Houston, TX
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| Posted: Thu Jan 18, 2018 11:24 am Post subject: |
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Hi mwu,
Are the 1:1 part files available to download? I see the 3:1 parts are. I also see the 1:1 available to view but can they be saved. Thank you
Regards,
Alex |
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2010*smiths
Joined: 18 Apr 2013
Posts: 52
Location: UK
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| Posted: Thu Jan 18, 2018 12:17 pm Post subject: |
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| Great work by Marcus. |
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