Arithmometer

thingiverse

I want to have this #Das will ich haben https://www.youtube.com/watch?v=nyCrDI7hRpE The Frenchman Charles Xavier Thomas de Colmar produced a mechanical calculator in the 19th century, called the Arithmometer. https://de.wikipedia.org/wiki/Arithmometer On http://www.arithmometre.org/, you can find a beautifully designed website with old patents too. ##03.11.2019 The Plan An addition part with a staff wheel 0 - 9 on a gear 10Z. All gears are created with module 2 https://bit.ly/2KQO69U, making it easy to print (Bilder first drafts) Direct transfer of the tens digit to the next wheel using one tooth. For an indirect transfer, like in the original machine, PLA printing is not fine enough. Let's see if this also works for multiple digits. The display will be redirected through conical gears. With two offset conical gears for addition and subtraction. ##24.11.2019 The first parts print I have created a 3D CAD construction. Everything is ready for the 3D printer. Axles from aluminum rods, M3 screws, Kugellager when necessary. The staff wheel looks great. All bearings and axles will come with inserts (axle plate) into the housing. Then I won't need to reprint the whole housing when making changes. The axle plate doesn't fit in the housing parts. The tolerances between the housing wall and the nut are too small. I need to change it and print again. ##26.11.2019 New axle plate prints I have enlarged the nuts on the front and rear axle plates. Now, the base plates fit. 2x Base plate lying down will be printed. Probably I'll still change this. Connecting individual calculation units with Alu-winkel 15x15x1 mm or so. Next, I'll design a button for numbers 0-9. Let's see how the raster works out.