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This shows you the differences between two versions of the page.
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11e [2015/10/26 21:17] clodoveu created |
11e [2024/03/21 15:30] (current) clodoveu |
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| * [[etc|Back to Offline Hours]] | * [[etc|Back to Offline Hours]] | ||
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| + | * [[calc|Back to Mechanical Calculators]] | ||
| I purchased this machine in October 2015 at an online auction site. It's my first electric calculator. | I purchased this machine in October 2015 at an online auction site. It's my first electric calculator. | ||
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| This calculator has been manufactured by Brunsviga in Braunschweig (Brunswick), Germany. Its factory was originally dedicated to sewing machines, and obtained the rights to manufacture calculating machines using Odhner's design in 1892. Brunsviga, however, continued improving the design: according to {{ http://www.johnwolff.id.au/calculators/Brunsviga/Brunsviga.htm | John Wolfe}}, Franz Trinks, Brunsviga's engineer, registered more than 40 patents in the U.S. between 1905 and 1925, and received a honorary doctorate from Braunschweig University. | This calculator has been manufactured by Brunsviga in Braunschweig (Brunswick), Germany. Its factory was originally dedicated to sewing machines, and obtained the rights to manufacture calculating machines using Odhner's design in 1892. Brunsviga, however, continued improving the design: according to {{ http://www.johnwolff.id.au/calculators/Brunsviga/Brunsviga.htm | John Wolfe}}, Franz Trinks, Brunsviga's engineer, registered more than 40 patents in the U.S. between 1905 and 1925, and received a honorary doctorate from Braunschweig University. | ||
| - | The Brunsviga 11e was manufactured between 1952 and 1955. Based on its serial number, my machine was probably made in 1953 ou 1954. The machine is a little smaller than the FACIT C1-13, but with lower capacity: 7-digit input, 6 digits in the counter and the accumulator has 11 digits, as opposed to the FACIT C1-13's 13 digits. | + | The Brunsviga 11e was manufactured between 1952 and 1955. Based on its serial number, my machine was probably made in 1953. The machine is a little smaller than the FACIT C1-13, but with lower capacity: 7-digit input, 6 digits in the counter and the accumulator has 11 digits, as opposed to the FACIT C1-13's 13 digits. Some later 11e machines have clearing buttons marked 'I, II, III', but mine is older and has 'E, Z, R' buttons instead -- I am yet to learn the meaning of the letters. Many machines out there are 220V, but mine is 110V. |
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| + | This machine predates some full-keyboard ones, and although it is electric, keyboard machines were more expensive. It has been estimated that the list price of this machine in the 1950s would be equivalent to 1,500 euros today. | ||
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| + | I received the machine in working condition, but rubber feet and the roller at the rear were gone, and the electrical wiring needed to be revised. Of course, a full cleaning and lubrication were especially needed. Some functions were not working, such as the clearing of the counter, and some were hampered, possibly due to old lubrication. The belt that connects the motor to the mechanism has been replaced by a leather strip, the kind used in pedal-driven sewing machines. The loop is closed using a piece of string! | ||
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| + | In January 2017 I started working on the mechanical parts. I made it another belt, first trimming down an automotive one, but it turned out the sewing machine option was much better -- now closed with a wire clip. A bakelite switch, used to reverse the direction of the motor, was broken, and I fixed it with a thin metal strip, superglue and tweezers. All wiring was coming apart, so I replaced everything I could, and in the process replaced the cord connector. | ||
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| + | However, in the first few tests, one of the coils of the motor burned out. Oh well, insulatin must be bad all around, I guess. Now is time to find someone to rewind the coils in hopes the motor will work again. Next chapter coming up. | ||
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| + | **c1953 Brunsviga 11e s/n 286336 ** | ||
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| + | As purchased, in October 2015 | ||
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| + | {{ http://www.dcc.ufmg.br/~clodoveu/files/Images/Brunsviga-11e/Brunsviga-11e-1.jpg | As purchased}} | ||
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| + | **More about this machine** | ||
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| + | [[http://public.bht-berlin.de/hamann/brunsviga/brunsviga-11e/index.html | Operation]] | ||
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| + | [[http://public.bht-berlin.de/hamann/brunsviga/brunsviga-11e/indexi.html | Inside views]] | ||
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| + | [[https://www.youtube.com/watch?v=A6jFj8l1dZs | A video of the 11e in action]] | ||
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| + | [[https://www.youtube.com/watch?v=u0BN-6vKnsw | A video with the main functions]] | ||
| + | [[http://www.johnwolff.id.au/calculators/Brunsviga/Brunsviga.htm | John Wolfe's Brunsviga page]] | ||
| + | [[http://www.rechenmaschinen-illustrated.com/Brunsviga%2011E.htm | Some more photos]] | ||
| - | The 10-04 model was the very last manual calculator manufactured by Facit in Sweden. The model is very similar to the CM2-16, with the same specs, and a few external differences, including a plastic cover. It has a handle that pops out in the lower front to help moving the machine around in an office desk. | + | [[http://www.rechenmaschinen-illustrated.com/Brunsviga%2011E.htm | Three machines, compared. Notice the carrying case of one of them]] |
| - | This one is in pretty good shape, but the lubrication inside is the most deteriorated I have seen. Much grease has been applied, and it hardened in some parts. When I got it, it was completely stuck. Some directed cleaning and a thorough spray of kerosene have loosened part of the main subsystems, but it was not nearly enough. A full disassembly and cleaning was required, so that the machine could operate smoothly again. | ||
| - | I finally got around to disassembling, cleaning and reassembling the machine in January 2014. Inside, most parts are yellowish, I guess from zinc plating. This plating has reduced the number of stains in the sheet metal parts, but most of the problem was, again, the old lubricants. I experimented this time with a small and cheap ultrasonic cleaning device, using kerosene as a solvent (see photo below). It worked very well, especially with gears, screws and other parts with holes and details that are hard to get at with a brush or a cleaning cloth. | ||
