If you can, go for it. The horizontal orientation will help with strength.
I must have missed editing that section of video in. Those plates fit across the bottom of the bearing plate to hold the setting axle bearings in place.
Thank you for the compliments! I do not sell them. There is a tremendous amount of work involved -- too much to be able to sell them. Plus I need time to work on some other projects.
Skip Counting Wheel
I've updated the parts and the Instructable. There is now an option for splitting the step drum which reduces the minimum print volume to 160x160x170mm. That should allow more people to be able to build the Curta.
I used a triple c-bot I built (http://openbuilds.org/builds/triple-c-bot.1757/) to print the parts. The filament was 3D Mars from Amazon (http://amzn.to/2evDRLa)
It is a long build and he is a busy guy, but it hasn't gone unnoticed: https://twitter.com/donttrythis/status/730590977786662912More on that soon
To give a more specific timeline, it took about a year for the first Curta without paint (still haven't painted it yet). The second Curta I built faster, but spent months working out how to paint it. Doing a fresh one with paint and my full focus would probably take 2-3 months while also working full-time.
Wow! Curta for $10 -- that's the dream :)
I once added up all of the estimated print time from all of the files and it came out to 9.5 days. However, that is without any reprinting. The longest print is the lower housing which took 60 hours by itself.The work I didn't know about when I got started was the time it takes to file the parts to fit. Though I did expect the time it took to sand for painting.
I have my dad's slide rule. I really should look up how to use it some time.
I've built two Curtas. The first one was just to build one for myself. I haven't painted that one. The second one was to help put together all the documentation I needed for my build manual, assembly video, and this instructable as I went along and to establish a procedure for painting it. The first one is still not painted and needs a few parts reprinted (I dropped it -- that was a terrible crunching sound, btw).I have something special in the works for the fully complete and painted one -- that'll be announced later :)
Absolutely! One of my biggest goals for the Curta right now is to see others build it as well. Having good and repeatable instructions goes a long way towards that.
The calculator's basic operations are addition and subtraction (subtraction is actually done via 10's compliment addition similar to how a computer does subtraction via 2's compliment addition in binary). From there, multiplication can be done via repeated addition and division can be done by repeated subtraction. Multiple digit multiplication and subtraction is aided by being able to rotate the upper carriage which is the base 10 equivalent of a shift operation on a computer -- basically multiplying the input by a power of 10 as it adds it to the result. Those who are good at using it can also calculate squares and roots among other things (though roots are not as easy as simply using the square root operator at the press of a button).
Thanks! And for anyone / everyone reading, I think the biggest thanks I could get are pictures of completed builds. Here or on thingiverse (or both).
Etching PCBs With Press'n'Peel
Build a 3D Printed Curta CalculatorView Instructable »
The Universal Multipurpose Workbench