No, the drums don't rotate as per the original. The original has the drums index round - I could have done it with stepper motors, but gets noisy. These on the clock just turn at variable speed, there is a control panel on the side for each drum. However each drum has an embedded Neobendyum magnet at the 'A' position, and inside the clock is a hall effect sensor. Some very simple logic checks to see if all 4 drums are in exactly the same position and when this occurs, there is a mechanical chime inside that fires. In practice this means you get a random chime from the clock 3-4 times in a day. Not as Turing intended but a nice little touch as it appears to do something other than just spin the drums round.
On Wednesday, 9 November 2016 16:11:33 UTC, Zedsquared wrote: > That's beautiful! I love the "Cherenkoiv radiation in water" blue shade > of the LEDs too. > > What's the behavior of the drums? Do they permute properly? > > Cheers, > Robin. > > On 09/11/2016 15:49, Paul Parry wrote: > > Hi All, > > > > I thought I would just share my latest clock - the 'Bombe' made as a > > tribute to Alan Turing and the work carried out at Bletchley park during > > WWII. Has the lovely Dalibor tubes on there, and mechanically 1:1 > > accurate from the original Bombe. The Welchman Trust, who re-built the > > Bombe at Bletchley were kind enough to loan me a set of drawings. The > > drums are powered by brushless motors, and it is silent in operation ( > > unlike the actual Bombe! ) > > Would like to thank John S. for laying out one of the PCB's and also > > Dalibor for making the tubes to go on it. > > > > > > > > > > -- > > You received this message because you are subscribed to the Google > > Groups "neonixie-l" group. > > To unsubscribe from this group and stop receiving emails from it, send > > an email to [email protected] <javascript:> > > <mailto:[email protected] <javascript:>>. > > To post to this group, send email to [email protected] > <javascript:> > > <mailto:[email protected] <javascript:>>. > > To view this discussion on the web, visit > > > https://groups.google.com/d/msgid/neonixie-l/aedc9bfe-42ce-4fd1-a617-bcce71319698%40googlegroups.com > > > < > https://groups.google.com/d/msgid/neonixie-l/aedc9bfe-42ce-4fd1-a617-bcce71319698%40googlegroups.com?utm_medium=email&utm_source=footer>. > > > > For more options, visit https://groups.google.com/d/optout. > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/bd275f13-2c06-464b-ac67-9bd595f1e9cf%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
