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Grasshopper skeleton Clock
Excellent. Congratulations. The clock face - were the numerals etc etched? Grasshopper escape is quite something to start off with.- tok-tokkie
- Post #5
- Forum: Clock Construction
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Prototype "Harrison - Graham" Escapement
That is a great idea = Harrison & Graham. Using an electric remontoire to escape the tyranny of a drive train and concentrate on the visual & kinematic interest of your designs is both practical and appropriate. As you state "kinetic sculpture".- tok-tokkie
- Post #4
- Forum: Clock Construction
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Need help with drive train calculations
Gregg I am pleased that what I wrote of of use to you. • My clock has 1 sec pendulum which is hung high in the case so as to reduce the overall height of the case. I also wanted to limit the fall of the drive weight so that the bottom of the weight does not go past the bottom of the...- tok-tokkie
- Post #6
- Forum: Clock Construction
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Need help with drive train calculations
A seconds beating pendulum is about 1m long = 39 inches. Thus it seems the weight will have to be hung from a pulley. Remember the bottom of the weight is much below the pulley so, if it is not to move beyond the bottom of the pendulum, the fall needs to be reduced by the length of the weight...- tok-tokkie
- Post #3
- Forum: Clock Construction
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In Pursuit of a Gravity Escapement.
Woodward's placing of the aneroid capsules beneath his pendulum bob was very elegant because the diameters matched. Sattler have theirs attached about 1/3 down the rod which I find rather scruffy. Yes preservation of energy. But look at the Trinity equations where they introduce a myriad of...- tok-tokkie
- Post #27
- Forum: Clock Construction
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In Pursuit of a Gravity Escapement.
I forget my own child! I later realised I had forgotten about the position of the pendulum pivot and took your question to be why were the pallet pivots not coincident. So that is the question I answered. In the write up of the escape I linked in post #5 I explain that it was because I wanted...- tok-tokkie
- Post #25
- Forum: Clock Construction
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In Pursuit of a Gravity Escapement.
Post #21 you state it has pressure compensation. How have you arranged it? The maths to convert flag transit to swing amplitude must be complex. I positioned the gravity arms there because, initially, they pivoted in 2mm bore ball bearings. That was as close as I could get them to the...- tok-tokkie
- Post #24
- Forum: Clock Construction
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In Pursuit of a Gravity Escapement.
The resolution and precision of those Microset traces astonishes me. The variation of the beat is 0.000 004 sec = 0.35 secs/day & you could move that to span the 2 sec line so your clock can be beautifully accurate. Instead of a tray on the pendulum for regulating weights I have a weight on a...- tok-tokkie
- Post #22
- Forum: Clock Construction
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In Pursuit of a Gravity Escapement.
The swing scale on my clock is adjustable so I set 0 at left end of swing then right end of swing shows full swing in mm. At about 48mm it fails to unlock. Initially I set the swing to 54 but since then I have increased that to 56 or 58. I see the amplitude drop to 52 or so. But there is...- tok-tokkie
- Post #18
- Forum: Clock Construction
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In Pursuit of a Gravity Escapement.
The force applied to the pendulum is constant. It is the energy extracted from the pendulum that varies. What varies is the friction force to unlock the escape. The friction force varies directly in proportion to the load applied by the drive at the locking face. It is a very small force...- tok-tokkie
- Post #16
- Forum: Clock Construction
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In Pursuit of a Gravity Escapement.
I learned to minimize the inertia of the pallets and have an adjustable counter poise which let me make it easier for the escape wheel to raise it while simultaneously reducing the impulse. Hence my pallets are 1mm titanium. In my case those worked nicely together so I could get just the swing...- tok-tokkie
- Post #14
- Forum: Clock Construction
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In Pursuit of a Gravity Escapement.
What strikes me is the opposite approach between my design & yours. The original design has both a toothed escape wheel and a pin wheel for raising the pallet. I ended up ditching the pins & using the tips of the teeth of the escape wheel to do the lifting of the pallet. Here you have ditched...- tok-tokkie
- Post #10
- Forum: Clock Construction
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In Pursuit of a Gravity Escapement.
Thanks. Yes I can now clearly see the lifting of the pallet on the 15 pin proof of concept. The 60 pin version seems to be very quiet. But, thinking about it during the night, it occurred to me that the escape advances once per complete pendulum cycle so the 60 pin would suit a 'half-second'...- tok-tokkie
- Post #4
- Forum: Clock Construction
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In Pursuit of a Gravity Escapement.
I was unaware of that variation of a gravity escape. Your proof of concept has 16 teeth & pins (by my count). Only a single pallet so 1 escape per full pendulum cycle (back & forth). So, for 1 sec pendulum it would need 60 teeth - as you state. I made a 30 tooth gravity escape which I...- tok-tokkie
- Post #2
- Forum: Clock Construction
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Function Clock build from scratch
As gmorse says using a suspension spring would not work if the pallets are mounted directly on the pendulum. For a dead beat escape the pallets must be precisely constrained in relation to the axis of the escape wheel. You have made one so must appreciate how fine the tolerances are for the...- tok-tokkie
- Post #10
- Forum: Clock Construction
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Function Clock build from scratch
I am confused by your description. You write that the gearing is epicyclic. It appears to be a conventional gear train. Epicyclic Epicyclic gearing - Wikipedia The tooth profile looks conventional involute but it may be cycloidal Cycloid gear - Wikipedia Did you write epicyclic where you...- tok-tokkie
- Post #7
- Forum: Clock Construction
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Glass jewels in a precision regulator?
Here is a description of how to make your own jewels (except he uses agate): https://www.snclocks.com/TechnicalInformation/Articles/Making-your-own-clock-jewel/i-X4292D5- tok-tokkie
- Post #2
- Forum: General Clock Discussions
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Looking for clues about this 18th century British wheelwork design
Jevan, Assuming the diagrams you show are as in clocks then the lower green wheel is driving the upper grey pinion. The last drawing depicts the moment where the drive is transferred from the one pair of teeth to the next pair. As drawn the lie of action starts slightly before the line of...- tok-tokkie
- Post #26
- Forum: General Clock Discussions
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Seth Thomas 1801 - 1900 American I thought pendulum bob size didn't matter when it came to making a clock run properly?
Remember that it is the distance from the flex point of the suspension to the COM of the bob + rod. It is not just the bob alone. Switching to a lighter bob at the same position (position=flex point to center of bob) results in a higher COM because the contribution of the rod now has a...- tok-tokkie
- Post #11
- Forum: General Clock Discussions
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