===== Mechanical calculators: FACIT TK =====

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This machine was manufactured by FACIT in Sweden, in 1948 (see [[http://www.xnumber.com/xnumber/facit_TK.htm|here]]). It was the first calculator I bought in an online auction site, in November 2010. It was in pretty bad shape, including a bright green painting and missing screws in the cover. Worse than that, the previous owner's attempts at painting the exterior have resulted in mostly erased number wheels. Unfortunately, I couldn't see that in the site's photos.

I partially disassembled the machine, cleaning everything I dared removing, using John Wolff's instructions for the Facit C1-13 (see below), a later model with several improvements. I was able to fully disassemble the registers, and in the process I printed new numbers for the wheels. I designed and printed a thin strip of paper in a laser printer, cut each strip to size and glued each of them to a wheel. I also restored the plastic windows with acetate, and had the main levers and indicators re-chrome plated. Finally, the casing was repainted with the appropriate color, the Facit label was restored, and new screws were used externally -- all coming from savings and scraps of old desktop PC cases. 

I have no pictures of the partially disassembled machine, since this was my first one and I was unsure as to being able to put it back together, let alone in working condition. But here go some pictures of the final result.

**Have a mechanical calculator stored somewhere, and want to get rid of it? Send it to me!**

**1948 FACIT TK s/n 175713**

{{ http://www.dcc.ufmg.br/~clodoveu/files/Images/FACIT-TK/tk1.jpg?500 | Front right}}

{{ http://www.dcc.ufmg.br/~clodoveu/files/Images/FACIT-TK/tk4.jpg?500 | Front left}}

{{ http://www.dcc.ufmg.br/~clodoveu/files/Images/FACIT-TK/tk2.jpg?500 | Logo}}

{{ http://www.dcc.ufmg.br/~clodoveu/files/Images/FACIT-TK/tk3.jpg?500 | Serial number}}

**More about this machine**

[[http://www.johnwolff.id.au/calculators/Tech/FacitC1-13/C113.htm | Technical description]]

[[http://www.johnwolff.id.au/calculators/Tech/FacitC1-13/C113Rebuild.htm | Rebuilding the FACIT C1-13]]

[[http://public.beuth-hochschule.de/~hamann/facit/f-13/index.html | Operation ]]

[[http://www.johnwolff.id.au/calculators/Facit/Facit.htm | The evolution of FACIT calculators]]

[[http://www.youtube.com/watch?v=YXMuJco8onQ | Video: how pinwheel calculators work]]