New +/- 1 sec in 100 days mech clock
List,
Personally I’m blown away howsomeone can homer brew a mechanical clock like this.
Regards,
Perrier
Perrier,
Mechanical, yes. Home brew, no. It is an absolutely stunning clock, both in beauty and performance.
The designer, Martin Burgess, is a giant among clockmakers and this project reflects a life's work.
http://en.wikipedia.org/wiki/Martin_Burgess
There's more information about the clock, additional press links, and a copy of my talk about "Clock B" at the Harrison conference:
http://leapsecond.com/pend/clockb/
If any of you have specific questions about the clock let me know off-list. I'm still in Greenwich.
/tvb
----- Original Message -----
From: "Perry Sandeen via time-nuts" time-nuts@febo.com
To: time-nuts@febo.com
Sent: Sunday, April 19, 2015 10:55 PM
Subject: [time-nuts] New +/- 1 sec in 100 days mech clock
List,
Personally I’m blown away howsomeone can homer brew a mechanical clock like this.
Regards,
Perrier
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Moin,
On Mon, 20 Apr 2015 00:40:06 -0700
"Tom Van Baak" tvb@LeapSecond.com wrote:
Mechanical, yes. Home brew, no. It is an absolutely stunning clock,
both in beauty and performance.
Given the fact that a CNC milling machine can be bought quite cheaply
today, i would say that homebrew is easily possible. All you need
is a good understanding on different materials and how to machine them.
(This can be aquired using various machining books out there)
There's more information about the clock, additional press links, and a copy
of my talk about "Clock B" at the Harrison conference:
I would be very much interested in detail photographs and the construction
plans of the clock. Oh.. and if they happen to have a spare clock, i'd
like ot have that one too :-)
Attila Kinali
--
It is upon moral qualities that a society is ultimately founded. All
the prosperity and technological sophistication in the world is of no
use without that foundation.
-- Miss Matheson, The Diamond Age, Neil Stephenson
On Mon, 20 Apr 2015 09:59:06 +0200
Attila Kinali attila@kinali.ch wrote:
Mechanical, yes. Home brew, no. It is an absolutely stunning clock,
both in beauty and performance.
Given the fact that a CNC milling machine can be bought quite cheaply
today, i would say that homebrew is easily possible. All you need
is a good understanding on different materials and how to machine them.
(This can be aquired using various machining books out there)
Just to make sure there is no misunderstanding. What I ment here
was, that once you have the plans, machining the parts and building
the watch is easy. Comming up with a good plan is still hard.
Attila Kinali
--
< av500> phd is easy
< av500> getting dsl is hard
Hi
I suspect you could buy quite a few nice new high end cars for the price of that
clock.
Bob
On Apr 20, 2015, at 3:59 AM, Attila Kinali attila@kinali.ch wrote:
Moin,
On Mon, 20 Apr 2015 00:40:06 -0700
"Tom Van Baak" tvb@LeapSecond.com wrote:
Mechanical, yes. Home brew, no. It is an absolutely stunning clock,
both in beauty and performance.
Given the fact that a CNC milling machine can be bought quite cheaply
today, i would say that homebrew is easily possible. All you need
is a good understanding on different materials and how to machine them.
(This can be aquired using various machining books out there)
There's more information about the clock, additional press links, and a copy
of my talk about "Clock B" at the Harrison conference:
I would be very much interested in detail photographs and the construction
plans of the clock. Oh.. and if they happen to have a spare clock, i'd
like ot have that one too :-)
Attila Kinali
--
It is upon moral qualities that a society is ultimately founded. All
the prosperity and technological sophistication in the world is of no
use without that foundation.
-- Miss Matheson, The Diamond Age, Neil Stephenson
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
On 4/20/15 12:59 AM, Attila Kinali wrote:
Moin,
On Mon, 20 Apr 2015 00:40:06 -0700
"Tom Van Baak" tvb@LeapSecond.com wrote:
Mechanical, yes. Home brew, no. It is an absolutely stunning clock,
both in beauty and performance.
Given the fact that a CNC milling machine can be bought quite cheaply
today, i would say that homebrew is easily possible. All you need
is a good understanding on different materials and how to machine them.
(This can be aquired using various machining books out there)
I don't know about that.. I suspect that more than a CNC mill is
required: there's often a lot of craft and art in precision machinery
(like optical systems). There's a lot of craft in high performance
quartz oscillators: selecting the crystal, mounting it in a holder so
that it doesn't see untoward stresses, doing the seals, etc.
Certainly, a CNC makes a lot of the fabrication easier, and the fact
that you can mail order CNC parts is even cooler. Front Panel Express,
for instance, is a great way to make breadboard plates for connectorized
modular RF components. It's what I use after I decide that double stick
foam tape isn't appropriate any more.
But for things like threads and helices, your standard CNC isn't going
to do it.
And I suspect the machining of the gears might have been done in a
special way (other than a dividing table). For these kinds of high
precision applications, there's a lot of tricks in getting all the
periodic errors to cancel out:essentially to make the system precision
higher than some of the manufacturing steps.
Look at the ruling engines used to make diffraction gratings for instance.
Perhaps it is not a good analogy, but I think of
the cesium beam tube in the 5071A. The plans
alone are very non-trivial. Then there are
a bunch of proprietary machining details that
I can't disclose, that are way beyond the
merely having access to a CNC tool. The
systematic error due to the CBT is below
something like 1 part in 10^14, which is
1 second in 3 million years. Perhaps that
is in some sense equivalent to Harrison's
1 second in 0.3 years. 7 orders of magnitude
difference. As many time-nuts are probably
aware of, most if not all cesium clocks that are better
than the 5071A have reversible beams to
cancel out CBT assymmetry.
Rick Karlquist N6RK
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
On 20/04/2015 20:51, Attila Kinali wrote:
On Mon, 20 Apr 2015 09:59:06 +0200
Attila Kinali attila@kinali.ch wrote:
Mechanical, yes. Home brew, no. It is an absolutely stunning clock,
both in beauty and performance.
Given the fact that a CNC milling machine can be bought quite cheaply
today, i would say that homebrew is easily possible. All you need
is a good understanding on different materials and how to machine them.
(This can be aquired using various machining books out there)
Just to make sure there is no misunderstanding. What I ment here
was, that once you have the plans, machining the parts and building
the watch is easy. Comming up with a good plan is still hard.
Attila Kinali
I saw Harrison's number one (its replica?) at Greenwich some time ago. It is a
dual pendulum, 180 out of phase. I remember a lot of springs.
Don
Peter Torry
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
On 20/04/2015 20:51, Attila Kinali wrote:
On Mon, 20 Apr 2015 09:59:06 +0200
Attila Kinali attila@kinali.ch wrote:
Mechanical, yes. Home brew, no. It is an absolutely stunning clock,
both in beauty and performance.
Given the fact that a CNC milling machine can be bought quite cheaply
today, i would say that homebrew is easily possible. All you need
is a good understanding on different materials and how to machine them.
(This can be aquired using various machining books out there)
Just to make sure there is no misunderstanding. What I ment here
was, that once you have the plans, machining the parts and building
the watch is easy. Comming up with a good plan is still hard.
Attila Kinali
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
--
"Noli sinere nothos te opprimere"
Dr. Don Latham AJ7LL
Six Mile Systems LLC
17850 Six Mile Road
Huson, MT, 59846
mail: POBox 404
Frenchtown MT 59834-0404
VOX 406-626-4304
CEL 406-241-5093
Skype: buffler2
www.lightningforensics.com
www.sixmilesystems.com
Have the subject RFTG unit. Bought an RS-422 to USB converter, found a
simple terminal emulator (PuTTY), and scoured KO4BB's site.
Discovered that the pins for the otherwise unlabeled "RFTG-m RS-422
INTERFACE" drawing were reversed, and that you don't connect R to R and
T to T. The diagnostic software on KO4BB's site will not run on modern
Windows systems (sorry, I used Unix in the eighties but it's all windows
now).
Every second, PuTTY shows the string :110000000000000000E109FB with the
initial Failed status and :100000000000000000E109FA when the green light
comes on after about 20 minutes. Does anyone know how to decode that
string (presumably hex)? The strings were copied from the PuTTY screen
with ^C, not manually transcribed.
The RFTG unit does not acquire GPS lock after 32 hours. I had hoped that
the status message would tell me why it isn't locked.
Note that this is the 1998 version, not the newer ones.
Any clues to documentation appreciated.
Bill Hawkins