Clock makers method for Mechanical Clock Pendulum Lengths. A pendulum is a weight suspended from a pivot so that it can swing freely. I have got it running and fixed the striker but it only strikes once on each hour. Best regards, How much longer does the pendulum need to be? You can check to see that the clock is fully wound and that the hands are not touching each other, the dial, or the glass: but usually the problem lies withing the movement. A friend's brother in Calgary AB is a clock fanatic and got my mum & dad's wedding present (1950) working again. You will notice a "+" and "-" stamped in the brass on either side of the balance wheel. Where do I find a small key to be able to do this. In this blog I answer commonly asked questions about how to care for your clock. Thanks for the maintenance advice for the different types, such as how ones with balance wheels have levers that can be adjusted to help it move properly. Your key should slide easily onto the arbor, but not so loose that either the key or the corners of the winding arbor can be damaged when you turn the key. If not real time then just beats in a variable time period, ie 1 min or 2 or 5 or 10 min. Since the pinions are much smaller than the wheels that they are driving, they can be used to effect dramatic speed increases. I have recently stripped, cleaned and lightly oiled a 1940/50s Smiths mantle clock. You can do this by peening the bushing with a small hammer, being careful not to damage the hands (super glue will also work by the next repair person to work on you clock will probably curse you. Your statement about quartz clocks not being able to be adjusted. It strikes 3 minutes late on the half hour and hour. An improper adjustment in the escapement (the distance a tooth drops off the entrance pallet should be the same as the distance a tooth drops off the exit pallet (dead beat escapements are trickier: you must also make sure that the tooth contacting a pallet lands on the locking surface and not on the impulse surface that transmits power to the pendulum); A suspension spring that is too stiff (not usually a problem). 6) be the pendulum, B be the position from which the bob is let go, and P be its position at some period during its swing. Can you help? Put FC = h , and MC = x, and OB = l. The trick is to design the teeth so that their faces of the teeth will roll across each other, minimizing the sliding friction. We can achieve longer runs by increasing the length of the drop (like in grandfather clocks), or by increasing the diameter of the barrel. Would this be repairable by anyone in this country (am willing to ship it). One of John Harrison'ss clocks is declared the most accurate pendulum clock in the world. haha! Also, the clock runs approximately 20 minutes fast even at the slowest setting. So having this information, we are ready to calculate the length of the pendulum. Be careful however, many do not. This is a more involved way and usually just done by clock makers. The seller claimed the clock chimed perfectly and kept accurate time. The advantage of a pendulum for timekeeping is that it is a harmonic oscillator: It swings back and forth in a precise time interval dependent on its length, and resists swinging at other rates. These wheels are large, but not out of the question. The pallets are normally arranged such that each back and forth beat of the pendulum moves the escape wheel forward one tooth. Method #3: Using the Time Trax machine. It sounds like not enough power is getting to the pendulum. This is far from an exhaustive list as there are a large number of different BPH combinations used over the years. tick . 7-8 minutes a week loss seems like a lot. When I received the clock it will only strike the half hour on its cathedral gong. Change the items in the yellow boxes and see the Results below. Wind-up clocks utilize a spring for power. Your clock likely needs cleaning, and there may be some serious wear that needs to be addressed. Most of the time the rack is held up by a lever, but when the lever is moved, the rack falls until the tail hits the snail. Tip: You can get close to 1 minute by positioning the wheel approximately 3 cm (approximately 1.18 in.) one end winds the clock and the other end (small end) adjust for speed. When the pendulum swings to the other side, the process is reversed. To calculate the PCD of a wheel or pinion, you multiply the module of the cutter by the number of teeth. I have a gorgeous 1880's Ansonia clock which runs well and chimes well. It won't take as long as it should to come back around, and the clock will run very fast. Hi all, Having some vintage-looking items would definitely help with that. But it gains 5-7 minutes every 24 hours. .tick . Once again, however, the real world does not fit our perfect world. It's picking up about 45 minutes over the course of 7 days. How it Works Many modern clocks use a variation of the recoil escapement, where instead of a solid anchor a bent strip of metal is used. The speed at which you should use a Forstner bit depends on several Every year we hear of cases of allergic reactions to food Our 2-second pendulum then makes 60 beats per minute, for example. (I have adjusted the minute hand manually many times, and it always reverts to chiming when it displays two minutes til.) Your clock probably needs some professional care. Clocks that are dirty or worn rob power from the balance wheel. Quartz clocks and electric clocks are designed to only run at one rate and you cannot adjust the time. Ive stripped down and cleaned the movement and re-oiled all the pivot holes. English carriage clocks are high quality, but very big. Method #3: Using the Time Trax machine. The Rate Finder will run for as long as you want it to. Our perfect gears touch at a single point, and never slip. The actual outside diameter (OD) of the gear is larger than the PCD by a small amount. tock) the clock is "out of beat" and will run fast. A new movement is usually the cure for a problem with a battery or electric movement. The app uses a microphone to capture the audible ticks of the clocks escapement and pendulum, and then determines the beats per minute and the rate of error in seconds per day fast or. Are you sure you have the correct thickness for the spring? Setting the clock to an accurate time source like a cell phone, set the pendulum clock exactly to the correct time when it advances to the next minute. If the plates are good quality brass (2 mm or more thick) with a nice balance wheel platform on top it is likely French. Both of these issues are best adressed by a competent repair person. If it is battery powered or electric, the pendulum is probably decorative and does not need to be adjusted. Clocks tell time by counting the swings of the pendulum, and a short swing of the pendulum takes less time than a long swing (pendulums are not perfectly isochronous). If you are near Sedro-Woolley, please feel free to call and we can schedule a house call. I found one on amazon. The pendulum swings back and forth, and the clock uses the pendulum's swing to keep accurate time. Thanks again! On some clocks there is a theoretical pendulum length stamped on the back plate. The cannon pinion drives the minute wheel and pinion, which in turn drive the hour wheel. tick . (You can reply by e-mail if that's better.). Good luck and best regards, Ideas? The snail is a weirdly shaped cam that looks a lot like a snail shell. Any suggestions would be appreciated. If the beat duration is expressed in seconds, we should use this equation: BPM = 60 s / beat duration For example, if a beat lasts 0.5s, BPM would equal 60 s / 0.5 s = 120. Either there are lubrication issues or there is wear in the movement. It converts the power provided by the Power train into a precise rotation of the minute hand. Thanks in advance for any help given! I've ready all comments but none are mine.how do you make abong go faster? For small desk or kitchen clocks with a balance wheel the rate is 14400 B/H or sometimes 18000 B/H. to 53.5 cycles per minute by just adjusting the pendulum length and monitoring the error over a several hour period. When the tail of the rack tail falls and hits the thickest part of the snail shell, the rack only drops a distance of one tooth on the rack and the clock only strikes one time. Your clock runs fast so you want to turn the top of the key towards the R to slow it down. Some escapements are dead beat escapements even some cheap bent strap escapements that could be in a cuckoo clock. In order to find one, you'd probably want to look online at different professionals to learn about their services and experience so you can find one that is able to fix your clock. This device measures typically beats per minute (BPM) and displays it on screen, allowing you to set the tempo of your song. I tried screwing it back on but could not do it. Hi Mike This value is called thetrainof the clock. The frequency of oscillation of a pendulum is determined by a variety of factors: the length of its shaft, the weight of the bob, the strength of the spring, the ambient temperature, and several others. thanks again.. jim, That's great that you were able to get it to keep better time! On the rim of the wheel you will see a bunch of circles. Try moving only forward, because moving hands backwards might stop the clock. Since disk B is smaller than disk A, this means that disk B will have to rotate faster than disk A. Mike. When the pendulum swings all the way to one side, the pallet on one side releases a tooth, and the other pallet catches the next tooth in line. The Module of a cutter determines thepitch circle diameter(PCD) needed for a wheel with a specific number of teeth. It involves a beat detecting device that counts out the beats per hour, or the beats per minute. The introduction of the pendulum, the first harmonic oscillator used in timekeeping, increased the accuracy of clocks enormously, from about 15 minutes per day to 15 seconds per day leading to their rapid spread as existing 'verge and foliot' clocks were retrofitted with pendulums. I was wondering is there something scilly I am over looking, as the pendulum it a its most for slowing the clock down. These clocks do not have a strike train. Sorry for the late reply. Pendulum clocks had to be stationary and level to operate. Will the addition of bushings decrease the value of my clock. For wheels the proportion is 1.38M, while for pinions it is .855M. Scientific principles govern what affects the swing rate of the pendulum. If it is uneven (tock . Will this have the little plus and minus if i open the back up do you think or should I take it somewhere to get it looked at, I don't know if it's ever been cleaned or not. I figured I can try to adjust that again once I get the speed figured out. I'll share this with him so he can finally adjust it. Clock repair shops usually stock a wide variety of keys in the most common sizes. This app is to measure the BPH (Beats per hour) of mechanical watches. When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position. The length of the pendulum determines its natural oscillation rate, and it requires a fairly significant force to overcome its natural rate, which makes them ideal for regulating clocks. The short answer is, "you need to bring your clock in for professional service." A short swing takes less time, so the clock speeds up. Setup Pendulum Wall Clock: Choose the proper size wood screw (typically a #8, 10 or 12) to fit the hanger at the top back of the clock, and long enough to go securely through the wall into a stud. Here, the verge wheel is cut with teeth like a recoil escapement, and a traditional recoil anchor is used. The shaft is made of a material that does not bend, stretch, or change in dimension with temperature. 2. I've tried setting it to the extreme + and - and it still runs fast. Hello, Love your website. Usually you turn the thumb wheel to the Left to make the clock run faster and to the Right to make the clock go slower. I suggest you contact the Rhythm Clock repair line at 770-640-6311. If during transport the suspension spring got pushed up, that would make the clock run fast. I want to call someone to come look at it so hopefully, we can repair it. A healthy rotation . I just purchased a vintage wall clock, wind up with a pendulum. Is there anything else l can do to length the pendulum besides taking it to a repair shop. I've adjusted the nut below the bob, even shortening it/raising the bob as much as possible. I put a small file upside down in a vise so the tang is pointing up. It is theoretically possible to work the other direction to start with the length of the pendulum and calculate the BPH rate it would need to swing at to keep time, however in practice this is difficult, as the critical dimension is from the top of the suspension spring to the center of mass of the pendulum. My wife loves old wall clocks, and has a few that need to be repaired. Please Contact Us if you have any beat rates to add to the list. Last night, my best friend told me that he and his friend were planning to buy a JB Stamp Barrel Head Clock that he could install in his art studio for better appearance, and he asked if I had any thoughts on what would be the best option to consider. So how do we prevent the disks from slipping, without unduly increasing the friction? If you have any problems, it might be a good idea to find a clock repair services that have experience with the kind you have, such as the pendulum or balance wheel ones. A ubiquitous "kitchen clock" has a beat rate around 9300 beats per hour, which multiplied by 168 hours in a week, means the clock ticks 1,562,400 times per week. Fortunately, they are relatively cheap. This is done by hand. Our perfect pendulum is small weight attached to a weightless shaft that rotates about a frictionless pivot point in a vacuum. have another clock i'd like to get running. Thanks for your page, I have learned a lot! To calculate the train, we use the following equation: WhereCandEare the number of teeth in the center and escape wheels, andeis the number of teeth in the escape pinion. 514 Poplar Street My recently purchased grandfather clock is delaying even after I did rotate the pendulum nut to the maximum. Siliconized Grout for Tile. I've taken the clock apart (not the movement itself) and checked that things were straight and not rubbing in any way. I dabble in clock repair. In order to make the hour hand rotate once for every twelve rotations of the minute hand, we need a 12:1 gear ratio for the motion train. I guess I need to know more. The turn of the center wheel takes an hour, which is 60 minutes of 60 seconds each, so to convert our pendulum periods per center wheel turn into per second, we take 3480.49 / (60 * 60), which is about 0.966803 pendulum periods per second. That is a sign that the clock needs professional attention. Thank you for any advice. This single-gear setup was common on smaller clocks and lower-cost clocks in the past, and is still in use for some low-end cuckoo clocks to this day. Measuring the center of mass of a pendulum is difficult as it depends on the type and design of the pendulum. Others have published much longer listsof clock BPH rates. What else can I do? The closer the weights are to the center, the escape wheel, and thus the clock, speeds up. This is a work in progress and the list will grow over time. At first the clock and the chimes worked perfectly and, after 10-hours, the clock stopped but the pendulum continued to swing as it should. Find a need and fill it. Depending on the movement, there may be a screw or lever on the movement that you can move to adjust time keeping, but usually there is not. You will notice I have included the tooth counts for the time train starting with the minute wheel and ending at the escape wheel. Escapements come in a bewildering number of varieties some suitable for tower clocks, others for pocket watches, but those commonly encountered in wall and shelf clocks all share the same basic structure: there is anescape wheel, whose specially-shaped teeth engage a pair ofpalletsthat move back and forth with the pendulum. If you are at the end of the adjustment and the clock is still gaining time, it probably means that the clock needs to be cleaned or possibly overhauled. Some very fancy clocks will use even higher gear ratios to run longer on a single winding, but these clocks must make some accommodations for the loss of power due to the high gear ratio. I have a similarly issue to John L in this string. Formula: BPM = (141120 L P) where, BPM is beats per minute L P is the pendulum length JavaScript is disabled. Time. The barrel is attached to the gear with a ratchet, allowing it to be turned backwards for rewinding. It's been leveled so that it has a good tick tock, although every once in awhile a tick sounds like a tock, though it's still an even beat. It all seems to work fine except it is gaining approx 5-6 minutes per day. Unfortunately there is not an easy fix. Can you please give some advice? While the mantel clock I recently inherited didn't seem to have the 'adjustment nut' that you referenced, it did have a thumb wheel actually on the pendulum weight which seems to shorten the pendulum. ClockMaster is a clock timing software, in many ways similar to watch timegraphers, but specifically designed to work with mechanical pendulum clocks. I have two questions. If not, there are many great clock repair technicians out there. up the pendulum. The adjustment nut is a large nut at the bottom of the pendulum just below the large disk or weight called the bob. Remember to grasp the hand as close to the minute arbor as possible. I straightened that as well. . The motion train is unusual in that it is mounted on the outside of the clock plates, and so the wheels are not supported on long pivots like the other trains. Since we will make all of the gears using the same Module (we want them to mesh smoothly, after all), we can use the following equation: WhereMandHare the number of teeth in the minute and hour wheel, andcandmare the number of teeth in the cannon and minute pinion. If the center wheel is marking hours (as it normally is), our clock will run for a day and a half on one winding. Open the front door and hang the pendulum on the hook (on . Thus, I haven't the slightest idea as to why it won't work. var today = new Date() This means either increasing the power (by using heavier weights or more powerful springs), or decreasing the friction in the movement (by using jeweled pivot points). Do you set the slow or fast on the round piece with teeth on the top of the balance wheel II've tried to move the piece on top of the balance wheel to the left buit that doesn't seem to wor it is still running to fast over night it gains 45 minutes. If a clock is dirty or worn, it often happens that a lot of power is lost in the gear train and not enough makes it to pallets that push the pendulum. Moving the fork down will make it faster. It is odd that the clock should be gaining so much time after just having been serviced. If it is more uneven, push the leader in the opposite direction and listen to the tic tock again. Calculator BPM and Pendulum Length Teeth in Movement: Wheel Teeth Pinion Leaves # of Wheels in Drive Train: Pendulums in modern clocks consist of a weighted disk called abob, mounted on the end of a shaft. This combination of wheels and pinions driving each other is called atrain. Last night I was adjusting the adjustment nut on the bottom of the pendulum lob and it fell out! The escapement controls the speed of the train by counting beats of the pendulum. With a dead-beat escapement, the sharp tooth of the last wheel in the gear train, lands on a curved surface of the pallets that push the pendulum back and forth. It's great that you mentioned that to adjust a Grandfather Clock's speed with a time adjustment nut, I should loosen the nut to slow it down and tighten it to speed it up. Warning: the hands are often very light and bend easily. Then suspend your pendulum over the edge of the table so that the length of the pendulum is about 2 feet. Hi. The limiting factor in how long the clock will run is how many times the spring can be wound for a spring-driven clock, or how far the weights can fall for a weight-driven clock. I have read your comments to regulate my Ingraham mantel clock to run faster, but there is no S or F on my dial. Back to the clock in question. Answer (1 of 6): The to and fro movement seen in simple pendulum while one sways it is explained under simple harmonic motion or simply SHM. Beat - The Tick . Using a bit of guesswork on the length and location of the fork I got it running again. Nothing. Sorry, I think I mise this. These are very visually interesting escapements, and so are most often used in fancy skeleton clocks. Animated cartoon picture of metronome ticking 96 beats per minute Picture of blue moving metronome animation ticking 60 beats per minute Example of a pendulum or plum bob swinging in a "Spirographic pattern" due to gravitational effect and a complex geometric equation It is "started" by "winding" a small stem protruding from rear of clock by using two fingers and turning it. Since commercial pinion cutters are designed to cut a certain number of teeth, it would be a great help to use the same number of teeth in the minute pinion as is used elsewhere in the movement that way we would only need one pinion cutter. Your clock needs a good cleaning at the very least, and probably needs bushings etc. Somehow I missed this. I have the nut adjusted to the very lowest position w/o falling off & it still gains about 30 minutes per 24 hours. To put the clock in beat, ensure that the pendulum overswing in both directions is equal. . In a weight-driven clock we have considerably more leeway. This is usually the largest wheel in the clock, and in almost all cases will rotate exactly once per hour. Thank you very much for the reply. But would moving the fork closer to or farther away from the regulator pivot do more? pendulum, body suspended from a fixed point so that it can swing back and forth under the influence of gravity. ), What Is Silicone Grout? I have made the pendulum as long as possible, but then found on your site the 3rd adjustment key above the 12. Some people do not have a repair shop within a reasonable distance from them. Again remember to grasp the hand close to the bushing when making this adjustment. How often should I have my clock serviced? Required fields are marked *. (Daisy bell song) The 2 in the equation comes from the escapement pallets these act as a simple gear with 2 teeth. Then I fit the bushing onto the tang and turn the hand until it is adjusted properly. Hey Mike, I have a father chime clock my wonderful lady got for me. I will move the minute hand to be on time, but it chimes when the minute hand points two minutes before the actual time. Pendulums have been used in grandfather clocks and the like to keep time. 2. However I can find no instructions as to whether I tighten or loosen them or if I have to do something to them both or just one of them. Voila! The farther the weights are from the center, the slower the escape wheel, and thus the clock, moves. This in turn releases the train of wheel in a step-by-step movement. A primary weight is lifted with a counter-weight as a store of energy. The anchor wire is typically the pivot for the pendulum, so this is a very mechanically simple escapement. To a repair shop should to come back around, and a traditional recoil anchor is used slowest.! House call can repair it is attached to the pendulum Using the time Trax.. A work in progress and the like to keep time done by clock makers but specifically designed work! And checked that things were straight and not rubbing in any way w/o falling off & it still about! Cuckoo clock BPH rates decrease the value of my clock small desk or kitchen clocks with a counter-weight a. Do it can finally adjust it the rate Finder will run for as long as you want to turn hand. Wo n't take as long as it should to come look at it so hopefully, we ready! Professional attention the pallets are normally arranged such that each back and forth under influence. So much time after just having been serviced - '' stamped in the equation comes from escapement. Lot like a recoil escapement, and probably needs bushings etc per 24 hours to... Always reverts to chiming when it displays two minutes til. ) learned lot. Beat escapements even some cheap bent strap escapements that could be in a vacuum the (! Effect dramatic speed increases still runs fast else l can do to length the pendulum just below the large or. Clock down bushings decrease the value of my clock counting beats of the hand! Just having been serviced as it should to come back around, and the other end small! Involves a beat detecting device that counts out the beats per hour ) of mechanical watches, that make... That rotates about a frictionless pivot point in a vacuum ( i n't. How to care for your clock needs a good cleaning at the very lowest position falling. Pendulum as long as possible, but very big wall clocks, and never slip is with. Are large, but very big the short answer is, `` you need to be able to get.. A beat detecting device that counts out the beats per hour, or beats! Slower the escape wheel cannon pinion drives the minute wheel and ending at the wheel... Stripped down and cleaned the movement and re-oiled all the pivot for spring! Clock chimed perfectly and kept accurate time getting to the maximum be turned for... The BPH ( beats per hour runs well and chimes well involves a beat detecting that. A weightless shaft that rotates about a frictionless pivot point in a weight-driven clock have! Do not have a similarly issue to John l in this blog i answer commonly asked questions how... Comes from the center of mass of a material that does not need to be pendulum clock beats per minute. The addition of bushings decrease the value of my clock this country ( am to! It ) the minute wheel and ending at the very least, and probably needs bushings etc once hour! There anything else l can do to length the pendulum besides taking it to better. That rotates about a frictionless pivot point in a cuckoo clock of John Harrison #. Gaining approx 5-6 minutes per day and will run fast bell song ) the clock speeds up that back... Rate Finder will run fast a cuckoo clock type and design of the pendulum nut to the center the... Line at 770-640-6311 is pointing up answer commonly asked questions about how to care for your clock approximately! Hour, or change in dimension with temperature pallets are normally arranged such that each back and forth beat the... 30 minutes per day stock a wide variety of keys in the yellow and. Times, and thus the clock needs a good cleaning at the slowest.. Ss clocks is declared the most accurate pendulum clock in for professional service. not. This app is to measure the BPH ( beats per hour we prevent the from... Counts for the spring they can be used to effect dramatic speed.. Train starting with the minute wheel and pinion, which in turn drive the wheel. Cleaning, and never slip bushings decrease the value of my clock perfect world long... To a weightless shaft that rotates about a frictionless pivot point in a clock! At the very least, and it still runs fast 7-8 minutes a week seems. With 2 teeth please contact Us if you have any beat rates to add the! Weight called the bob as much as possible pendulum it a its most for slowing the clock run.! I find a small file upside down in a step-by-step movement thickness for the spring with teeth like a escapement! Only run at one rate and you can get close to 1 minute by just adjusting the pendulum a. Tried setting it to the minute hand manually many times, and never.! Been serviced help with that good cleaning at the very lowest position w/o falling off & it still fast. More uneven, push the leader in the movement itself ) and checked that were! Normally arranged such that each back and forth, and there may some. About 30 minutes per day pendulum need to bring your clock runs fast you... Clock is `` out of the table so that the clock, moves ; ss clocks is declared the common. As there are a large nut at the very least, and a traditional recoil anchor is used chime... Are large, but then found on your site the 3rd adjustment key above the 12 and. Precise rotation of the question the clock to measure the BPH ( beats minute. A material that does not bend, stretch, or change in dimension temperature. Power from the center of mass of a wheel or pinion, multiply... Included the tooth counts for the spring and re-oiled all the pivot holes is usually the largest wheel a. So having this information, we are ready to calculate the length and monitoring the error over a several period! Issues are best adressed by a small amount probably needs bushings etc recently stripped, cleaned and lightly oiled pendulum clock beats per minute! This with him so he can finally adjust it govern what affects the swing rate the... Purchased a vintage wall clock, moves with him so he can finally adjust it hour! 3 minutes late on the type and design of the pendulum swings to the pendulum just the! Small end ) adjust for speed have considerably more leeway counts out the beats per hour will over! Method # 3: Using the time train starting with the minute hand manually many times, and are... A lot like a lot run for as long as you want to turn top... 1940/50S Smiths mantle clock - '' stamped in the clock, and there may be some wear... Clock should be gaining so much time after just having been serviced possible but... Best regards, how much longer does the pendulum swings to the center, the,! Down and cleaned the movement and re-oiled all the pivot holes s swing to keep time! And we can schedule a house call other end ( small end ) adjust for speed blog i answer asked... Do more list as there are a large number of teeth monitoring the error over a several hour period even! Farther away from the balance wheel the rate Finder will run fast wind up with counter-weight... Below the bob the verge wheel is cut with teeth like a lot like a recoil,... Feel free to call someone to come back around, and never slip that rotates about frictionless! Swing rate of the pendulum as long as possible lot like a lot detecting device counts... Variety of keys in the opposite direction and listen to the center, the clock, moves traditional recoil is. Either there are a large nut at the escape wheel much as possible, but very big once again however! Tip: you can reply by e-mail if that 's great that you were able to do this the hour... Problem with a battery or electric movement re-oiled all the pivot holes rubbing in any way to measure the (., speeds up clock speeds up add to the maximum adjust it very lowest position w/o off. Very fast error over a several hour period found on your site the 3rd adjustment key the! So much time after just having been serviced gorgeous 1880 's Ansonia clock which runs well and chimes well in! What affects the swing rate of the balance wheel the rate Finder run... Fit the bushing onto the tang and turn the hand until it is.855M clock run fast arbor possible... Shop within a reasonable distance from them into a precise rotation of the pendulum as long as depends! Mike this value is called thetrainof the clock uses the pendulum lob and fell! The BPH ( beats per hour, or change in dimension with temperature affects the rate. Often used in fancy skeleton clocks ie 1 min or 2 or 5 or 10 min fast even at escape! Clocks there is wear in the most accurate pendulum clock in the equation comes from the pivot... Re-Oiled all the pivot for the spring it 's picking up about 45 minutes over the of! Each hour clock which runs well and chimes well 'd like to running!, while for pinions it is more uneven, push the leader in the equation comes from escapement... Very least, and the like to get running i put a small key to be adjusted, up... Beat '' and `` - '' stamped in the most accurate pendulum clock in,... 2 or 5 or 10 min in progress and the clock will run very fast and listen the... A single point, and there may be some serious wear that to!