Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!
Curta Calculator Type I scaled at 3:1
by mwu, published
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Update 3/29/201 -- In the process of preparing the build manual, I have a list of several files which need correcting to get correct assembly and functionality out of the Curta. I recommend waiting until I can get these changes published before doing much printing if you haven't yet. Particularly, the mount hole for the crank handle on the main shaft was 90 degrees from where it should have been.
While the build manual is taking me some time, I am excited by the progress on it so far. In the process I have disassembled and reassembled the second Curta which helped me find and eliminate extra friction. I will have another video of the Curta going up soon which will cover a simple, but difficult calculation that has eluded a correct result on the 3D printed Curta until now. That calculation is simply starting at 0, adding 1, then subtracting 1. The result should be a completely zero result with zero showing on the turns counter as well. Since the Curta utilizes addition for subtraction, the calculation requires the Curta to rotate every result and turns counter dial to 9 and a carry operation to cascade all the way around bringing each digit back to 0.
Update 3/9/2017 -- I have assembled a second Curta and taken loads of pictures along the way. I can now either work on a build manual utilizing the photos I took or a series of build videos. There are a LOT of photos and a lot of steps involved. What would you prefer (google form poll)?
Update 01/18/2017 -- I have updated the transmission gear and lockout parts to be printable using a 0.4mm nozzle instead of a 0.25mm nozzle. Thanks to the feedback from MikeHenry. I also updated a repaired Lower Housing.stl due to non-manifold edges.
Update 01/06/2017 -- I found that the tens bell also had non-manifold edges causing problems when slicing. A repaired copy has been uploaded.
Update 12/30/2016 -- I found that the main axle and step drum had non-manifold edges that may cause problems when slicing (Simplify3D skips a few layers in the next to last row of teeth). I uploaded a repaired copy.
Update 12/17/2016 -- I found a part I had missed uploading a file for. It's the securing spring for the zero positioning plate. I have now added the file and added it to the BOM.
Update 12/12/2016 -- I just added layer height, infill, orientation, and support notes to the printed files in the BOM. First step in getting actual build instructions.
The Amazing Curta Calculator is now 3D Printable!
After a lot of effort, I have collected everything needed to 3D Print your own Curta Calculator! This includes all 3D print files and a BOM listing tools and non-printed parts necessary for full assembly.
Note that assembly is incredibly difficult requiring knowledge of the calculator and where parts go, in what order to assemble, and how to properly calibrate the device. I do not yet have instructions completed for assembly, but they will be coming as an instructable. That will be done sometime in 2017.
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Curta Calculator Type I scaled at 3:1 by mwu is licensed under the Creative Commons - Attribution license.
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- You must attribute (give credit) to the creator of this Thing.
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