[time-nuts] New ± 1 sec in 100 days mech clock

Bob Camp kb8tq at n1k.org
Wed Apr 22 18:57:28 EDT 2015


In some ways this is like:

I can buy tubes of paint and some brushes down at Hobby Lobby.

That’s what I need to paint the next Mona Lisa. 

While that’s all quite true, it’s not the whole story :) 

There’s an enormous amount of training and experience that goes into fitting this
sort of thing up. There is even a certain amount of “art” that goes beyond simple training. 
Not all watch/clock makers are up to this sort of thing. Highly skilled people have been trying
to do this kind of clock for a *long* time ….It’s not just an assembly process. 

Indeed I’d love to see the details of how they did the design. There are some basic
challenges that they (obviously) addressed very well. Even with a good description 
of what they did and a pile of parts, you are still only (maybe) 10% of the way to a duplicate. 

Note: I’m *not* claiming I am any good at clock making. I’ve simply seen a lot of 
this sort of work done over the years. 


> On Apr 22, 2015, at 10:03 AM, Dan Kemppainen <dan at irtelemetrics.com> wrote:
> Hi,
> In all reality, achieving these results without decades of experience is probably unlikely. That said, are the specific plans available or published anywhere? Is is possible that someone willing to build and tinker could make a 'functional' copy of this unit?
> I would guess that not all of the parts need extreme tolerances. But even then many mills are holding positioning tolerances well under .001", with tool deflections of .0001" or under (if run and maintained properly, that is). My 'list' includes a mechanical clock build. And this one would be a dandy to try to build!
> In any case, the clock is still interesting to read about! It's great that some of you are lucky enough to get to see it! :)
> Dan
> On 4/21/2015 12:00 PM, time-nuts-request at febo.com wrote:
>> You could always use the traditional method of piercing saw and files.
>> Thinking about it I suppose files were the original milling machine.  Be
>> aware that the horological approach is different from the engineering
>> approach and there are numerous traps waiting for the unwary.  Harrison
>> and Martin's clock B have remarkable performance but could still be
>> improved by using multiple pendulums to overcome the noise effects for
>> example a two pendulum clock is performing within 1 second in six months
>> (so far) so I will have to get the hacksaw out for the three pendulum
>> version - or is it back to the GPSDO.
>> Peter
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