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It seems like all the gears before the minute hand could take advantage of this feature.  It may require an escape wheel with a prime number of teeth and a pendulum with a slightly different period.  Eventually, the minute hand needs to rotate exactly once per hour.

The gears between the minute hand and hour hand are really slow moving, so don't really have an issue with wear.

Its a common practice in geared devices to choose prime number tooth count for the reasons you mentioned.  However, this applies where the exact gear ratio is not so critical, such as in a car's transmission.  The problem with using this in clocks is that the ratio of 2 prime numbers cannot be an integer.

However, you only really need integer ratios for gearing the hands together, while the rest of the power train can be of prime toothed gears.
I've not found information on the Internet that explains how to get an even/uniform gear using gear proper tooth counts in a wooden clock design. It's really quite easy once you know the answer. Uniform gear wear is achieved by ensuring the tooth counts of the two gears meshing together are Relatively Prime (also called Coprime) to each other; this occurs when the Greatest Common Divisor (GCD) of each gear tooth count equals 1, e.g. GCD(16,25)=1

Any other result other than 1 will have a repeating pattern that does not allow every tooth to mesh with each other. E.g. a 15 tooth pinion meshing with a 25 tooth drive gear. GCD(15,25)=5  and so 15/5=3 and 25/5=5; this means that the same 3 pinion teeth will mesh with the same 5 drive gear teeth, they will not have uniform wear.
Practical Explanation ( For Example ) :- `1st of all can you tell me every single seconds detail from that time when you born ?? ( i need every seconds detail ?? that what- what you have thought and done on every single second )

can you tell me every single detail of your `1 cheapest Minute Or your whole hour, day, week, month, year or your whole life ??

if you are not able to tell me about this life then what proof do you have that you didn't forget your past ? and that you will not forget this present life in the future ?

that is Fact that Supreme Lord Krishna exists but we posses no such intelligence to understand him.
there is also next life. and i already proved you that no scientist, no politician, no so-called intelligent man in this world is able to understand this Truth. cuz they are imagining. and you cannot imagine what is god, who is god, what is after life etc.
for example :Your father existed before your birth. you cannot say that before your birth your father don,t exists.

So you have to ask from mother, "Who is my father?" And if she says, "This gentleman is your father," then it is all right. It is easy.
Otherwise, if you makes research, "Who is my father?" go on searching for life; you'll never find your father.

( now maybe...maybe you will say that i will search my father from D.N.A, or i will prove it by photo's, or many other thing's which i will get from my mother and prove it that who is my Real father.{ So you have to believe the authority. who is that authority ? she is your mother. you cannot claim of any photo's, D.N.A or many other things without authority ( or ur mother ).

if you will show D.N.A, photo's, and many other proofs from other women then your mother. then what is use of those proofs ??} )

same you have to follow real authority. "Whatever You have spoken, I accept it," Then there is no difficulty. And You are accepted by Devala, Narada, Vyasa, and You are speaking Yourself, and later on, all the acaryas have accepted. Then I'll follow.
I'll have to follow great personalities. The same reason mother says, this gentleman is my father. That's all. Finish business. Where is the necessity of making research? All authorities accept Krsna, the Supreme Personality of Godhead. You accept it; then your searching after God is finished.

Why should you waste your time?
all that is you need is to hear from authority ( same like mother ). and i heard this truth from authority " Srila Prabhupada " he is my spiritual master.
im not talking these all things from my own.

in this world no `1 can be Peace full. this is all along Fact.

cuz we all are suffering in this world 4 Problems which are Disease, Old age, Death, and Birth after Birth.

tell me are you really happy ?? you can,t be happy if you will ignore these 4 main problem. then still you will be Forced by Nature.

if you really want to be happy then follow these 6 Things which are No illicit sex, No gambling, No drugs ( No tea & coffee ), No meat-eating ( No onion & garlic's )

5th thing is whatever you eat `1st offer it to Supreme Lord Krishna. ( if you know it what is Guru parama-para then offer them food not direct Supreme Lord Krishna )

and 6th " Main Thing " is you have to Chant " hare krishna hare krishna krishna krishna hare hare hare rama hare rama rama rama hare hare ".
If your not able to follow these 4 things no illicit sex, no gambling, no drugs, no meat-eating then don,t worry but chanting of this holy name ( Hare Krishna Maha-Mantra ) is very-very and very important.

Chant " hare krishna hare krishna krishna krishna hare hare hare rama hare rama rama rama hare hare " and be happy.

if you still don,t believe on me then chant any other name for 5 Min's and chant this holy name for 5 Min's and you will see effect. i promise you it works And chanting at least 16 rounds ( each round of 108 beads ) of the Hare Krishna maha-mantra daily.
Here is no Question of Holy Books quotes, Personal Experiences, Faith or Belief. i accept that Sometimes Faith is also Blind. Here is already Practical explanation which already proved that every`1 else in this world is nothing more then Busy Foolish and totally idiot.
every `1 is already Blind in this world and if you will follow another Blind then you both will fall in hole. so try to follow that person who have Spiritual Eyes who can Guide you on Actual Right Path. ( my Authority & Guide is my Spiritual Master " Srila Prabhupada " )
if you want to see Actual Purpose of human life then see this link : ( {Bookmark it })
read it complete. ( i promise only readers of this book that they { he/she } will get every single answer which they want to know about why im in this material world, who im, what will happen after this life, what is best thing which will make Human Life Perfect, and what is perfection of Human Life. ) purpose of human life is not to live like animal cuz every`1 at present time doing 4 thing which are sleeping, eating, sex & fear. purpose of human life is to become freed from Birth after birth, Old Age, Disease, and Death.
Other escapements / Re: Continuous motion escapements, Conical pendulum clock
« Last post by rus on April 21, 2014, 05:54:15 PM »
Hi I've been reading your discussion and found this to share:
Fully Functional Conical Wooden Clock wood -not finished-

Good luck,
Other escapements / Re: Continuous motion escapements, Conical pendulum clock
« Last post by steve323 on April 10, 2014, 11:18:22 PM »
I thought about this some more and here are some comments:

Consider a clock with a 39" pendulum and 30 tooth escapement.  The escapement will rotate once every 60 seconds.  This will need to be divided down by 60 for the minute hand.  It will need to divided down again by 12 for the hour hand.

Compare this to a 39" conical pendulum.  The drive mechanism will rotate once every 2 seconds.  This needs to be divided down by 1800 for the minute hand.  The divide by 12 for the hour hand is identical.  One difference between an oscillating pendulum and a conical pendulum is that the fastest wheel needs to be driven 30 times faster with the conical pendulum.  This is the difference between an escapement rotating every 60 seconds vs a drive mechanism rotating every 2 seconds with a conical pendulum.

It appears that the start/stop characteristic of the escapement gets replaced by 2 sets of wheels to speed up the "escapement" by 30X.  My guess is that this might be about equal from a mechanical efficiency perspective.  One advantage of the conical pendulum is its near silent operation.  This is great for a bedroom clock.

I want to build one, just as soon as I can finish a few of the other projects on my list.  :)

Other escapements / Re: Continuous motion escapements, Conical pendulum clock
« Last post by steve323 on April 09, 2014, 09:17:53 PM »
The first video of the Farcot clock looks very promising.  It appears to have the same regulating accuracy as a standard oscillating pendulum.  It seems like the start/stop motion of the escapement would be completely eliminated and it should require significantly less weight to drive the clock.  The most sensitive part of a clock is probably be the escapement.  This design replaces the escapement with a continuous rotary motion.

A few aspects would make a clock differ from a traditional clock.  All of the wheels are below the pendulum and the first stage rotates vertically.  The clock face needs to be horizontal, so one pair of wheels needs to be at 90 degrees.  The clock face is typically above the pendulum, but this is easily fixed by using shaft to the top.  The video shows another interesting option to use a statue of a person holding the pendulum and keep everything else at the bottom. 

I suspect that the fly fan and centrifugal governor would not work well as a clock.  A fly fan would be very sensitive to air density, so the speed would change based on barometric pressure in addition to being sensitive to the driven weight.  It is acceptable for regulating the chimes, since a small change in the time between notes is OK.  A centrifugal governor seems like a poor regulator.

General Discussion / Re: Thomas Clock build
« Last post by Rocketcaver on February 25, 2014, 04:48:57 PM »
Inspection of my newly cut gear revealed that the actual dimensions don't match those shown on the pattern.
Obviously I should have checked before I cut the gear.  Oh well, it was good practice.
Looking over my printer settings, I find that when printing PDF's it defaults to "shrink to fit".  Setting it back to "actual size" fixes the issue, but then of course some parts are too big to fit on an 8 1/2" X 11" sheet.  Luckily I can print 11" X 17" sheets, that should fix the problem.  I'll try that this afternoon.
What's that they always say about "measure twice and cut once"?
I freely admit this stupid newbie type mistake on my part so any other beginners who might stumble across this thread might be forewarned.
Still, it was only one gear.  I had a lot of fun making it, and learned several things in the process.  I think I'll go ahead and finish it out and pretty it up and make a wall hanging out of it.


Yep, the 11X17 set to "actual size" did the trick.

General Discussion / Thomas Clock build
« Last post by Rocketcaver on February 25, 2014, 03:21:39 AM »
Let's start with some background.
Somewhere around 1990 or so, I ordered the Thomas Clock plans from an ad in the back of some magazine.  I received a set of large folded up plans with an assortment of very intimedating looking gears and other pieces.  The plans went into a drawer and didn't see the light of day again for many years.
Somewhere around 2010 or so I came across those plans again.  They were a bit ragged around the folds from being shuffled around over several moves and several other "filing systems".  My interest renewed, I found the company who originated the plans online and emailed them asking if the plans had been updated as I was once more interested in building the clock.  I received back a very nice email with a PDF attachment containing the revised version of the plans.  It seems that the old original plans had been drawn by hand, the new version had been recreated using CAD, and a few minor issues had been corrected.  The parts were all nicely arranged logically on 8 1/2 X 11 sheets for full scale print out.
Life happened and a few more years passed.  Now, at long last, I am ready to start building this clock.
I have made a bit of a start already, over the last couple of nights I have cut out one of the bigger gears.  Not being a wood worker at all, this has been a challenge, and a lot of fun.  I cut the teeth on the bandsaw, and cut out the spokes on the new scroll saw... my first scroll saw project!  I was able to repair a dumspter-found disc sander, so I used that to dress the ends of the teeth, and in a few days I should receive a new (cheap) 1" belt sander to true up the faces of the teeth.  One might think that the whole project was just an excuse to buy a bunch of new tools.  I might have to think ponder that one for a while.
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