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Pendulum clock runs *fast* in hot weather
"Terry Casey" wrote in message
... If the clock is wall hung, use a spirit level to get it perfectly vertical and make a small mark on the wall so that you can see immediately if it has moved. Both clocks are longcase, standing on the floor. Now start the clock and see if that cures the problem. If not, you need to adjust the pendulum's vertical position Move the pendulum to one end of its natural travel range and keeping going slightly further, just overcoming the resistance. Start the clock and listen. Is it better or worse? If better keep nudging the pendulum a bit further in the same direction and try again. If it is now worse, move the pendulum in the opposite direction, again moving it past its natural end stop. Repeat the adjustments until the clock sounds right. All things being equal, it should now carry on ticking without stopping. Fascinating. I didn't know that. I'll try it on our clock. Did you get round to trying it - and was it successful? For the very old grandfather clock about 7 feet tall, I tried that. I can't feel any change in resistance as I move pendulum aside as far as the side of the case, which is obviously the limit of its travel. I wonder if the mechanism is so old that it doesn't have automatic adjustment. Maker dates from early 1800s (Barwise Mitchell, Cockermouth) and may not have had any enhancements since then. For the much newer granddaughter clock (about 4 feet tall), the pendulum is about 3" long and consists of a bob that hooks onto a vertical piece of springy metal that nudges the escapement feed sideways. This moves with the same resistance as far as a hard limit, beyond which the escapement release doesn't move any further and the spring metal pivots about the escapement release mechanism rather than about the suspension point of the springy metal which is slightly higher. Pressing and holding the springy metal on one side of its hard limit doesn't seem to alter the neutral rest position of the bob or the even-ness of the tick and the tock. The clock runs for a few minutes and the ticks get fainter and fainter until the clock stops. The hands do go round. The mainspring (and chiming spring) are both fully wound and the mainspring winder definitely won't go any further, so it's not broken and winding forever without tightening the spring. The clock seems to be fairly sensitive about its fore/aft angle. Against the wall it stops but pulled out a few inches it has been running for about ten minutes and the tick sounds more even. I wonder if that's what the problem was. I'll find a spirit level and see how vertical it is fore/aft and side/side. |
Pendulum clock runs *fast* in hot weather
On Thu, 16 Aug 2018 15:38:40 +0100, "NY" wrote:
"Terry Casey" wrote in message ... If the clock is wall hung, use a spirit level to get it perfectly vertical and make a small mark on the wall so that you can see immediately if it has moved. Both clocks are longcase, standing on the floor. Now start the clock and see if that cures the problem. If not, you need to adjust the pendulum's vertical position Move the pendulum to one end of its natural travel range and keeping going slightly further, just overcoming the resistance. Start the clock and listen. Is it better or worse? If better keep nudging the pendulum a bit further in the same direction and try again. If it is now worse, move the pendulum in the opposite direction, again moving it past its natural end stop. Repeat the adjustments until the clock sounds right. All things being equal, it should now carry on ticking without stopping. Fascinating. I didn't know that. I'll try it on our clock. Did you get round to trying it - and was it successful? For the very old grandfather clock about 7 feet tall, I tried that. I can't feel any change in resistance as I move pendulum aside as far as the side of the case, which is obviously the limit of its travel. I wonder if the mechanism is so old that it doesn't have automatic adjustment. Maker dates from early 1800s (Barwise Mitchell, Cockermouth) and may not have had any enhancements since then. For the much newer granddaughter clock (about 4 feet tall), the pendulum is about 3" long and consists of a bob that hooks onto a vertical piece of springy metal that nudges the escapement feed sideways. This moves with the same resistance as far as a hard limit, beyond which the escapement release doesn't move any further and the spring metal pivots about the escapement release mechanism rather than about the suspension point of the springy metal which is slightly higher. Pressing and holding the springy metal on one side of its hard limit doesn't seem to alter the neutral rest position of the bob or the even-ness of the tick and the tock. The clock runs for a few minutes and the ticks get fainter and fainter until the clock stops. The hands do go round. The mainspring (and chiming spring) are both fully wound and the mainspring winder definitely won't go any further, so it's not broken and winding forever without tightening the spring. The clock seems to be fairly sensitive about its fore/aft angle. Against the wall it stops but pulled out a few inches it has been running for about ten minutes and the tick sounds more even. I wonder if that's what the problem was. I'll find a spirit level and see how vertical it is fore/aft and side/side. Up to now it's been about your grandfather clock, but now you also mention a granddaughter clock. Regarding the original one, I don't understand Terry Casey's suggestions. Perhaps he's trying to bend the flexible strip at the top of the pendulum, which might have the same effect as tilting the whole clock sideways by a wedge underneath. Making the clock vertical by plumbline or spirit level is no guarantee that it will tick evenly. so I recommend you try my tilting suggestion. I did post that on 07/08/18, but unfortunately the title got prefaced by and shows up outside this thread, so maybe you didn't see it. -- Dave W |
Pendulum clock runs *fast* in hot weather
On Thu, 16 Aug 2018 15:38:40 +0100, "NY" wrote:
"Terry Casey" wrote in message ... If the clock is wall hung, use a spirit level to get it perfectly vertical and make a small mark on the wall so that you can see immediately if it has moved. Both clocks are longcase, standing on the floor. Now start the clock and see if that cures the problem. If not, you need to adjust the pendulum's vertical position Move the pendulum to one end of its natural travel range and keeping going slightly further, just overcoming the resistance. Start the clock and listen. Is it better or worse? If better keep nudging the pendulum a bit further in the same direction and try again. If it is now worse, move the pendulum in the opposite direction, again moving it past its natural end stop. Repeat the adjustments until the clock sounds right. All things being equal, it should now carry on ticking without stopping. Fascinating. I didn't know that. I'll try it on our clock. Did you get round to trying it - and was it successful? For the very old grandfather clock about 7 feet tall, I tried that. I can't feel any change in resistance as I move pendulum aside as far as the side of the case, which is obviously the limit of its travel. I wonder if the mechanism is so old that it doesn't have automatic adjustment. Maker dates from early 1800s (Barwise Mitchell, Cockermouth) and may not have had any enhancements since then. For the much newer granddaughter clock (about 4 feet tall), the pendulum is about 3" long and consists of a bob that hooks onto a vertical piece of springy metal that nudges the escapement feed sideways. This moves with the same resistance as far as a hard limit, beyond which the escapement release doesn't move any further and the spring metal pivots about the escapement release mechanism rather than about the suspension point of the springy metal which is slightly higher. Pressing and holding the springy metal on one side of its hard limit doesn't seem to alter the neutral rest position of the bob or the even-ness of the tick and the tock. The clock runs for a few minutes and the ticks get fainter and fainter until the clock stops. The hands do go round. The mainspring (and chiming spring) are both fully wound and the mainspring winder definitely won't go any further, so it's not broken and winding forever without tightening the spring. The clock seems to be fairly sensitive about its fore/aft angle. Against the wall it stops but pulled out a few inches it has been running for about ten minutes and the tick sounds more even. I wonder if that's what the problem was. I'll find a spirit level and see how vertical it is fore/aft and side/side. Up to now it's been about your grandfather clock, but now you also mention a granddaughter clock. Regarding the original one, I don't understand Terry Casey's suggestions. Perhaps he's trying to bend the flexible strip at the top of the pendulum, which might have the same effect as tilting the whole clock sideways by a wedge underneath. Making the clock vertical by plumbline or spirit level is no guarantee that it will tick evenly. so I recommend you try my tilting suggestion. -- Dave W |
Pendulum clock runs *fast* in hot weather
On Thu, 16 Aug 2018 23:13:06 +0100, Dave W wrote:
On Thu, 16 Aug 2018 15:38:40 +0100, "NY" wrote: "Terry Casey" wrote in message ... If the clock is wall hung, use a spirit level to get it perfectly vertical and make a small mark on the wall so that you can see immediately if it has moved. Both clocks are longcase, standing on the floor. Now start the clock and see if that cures the problem. If not, you need to adjust the pendulum's vertical position Move the pendulum to one end of its natural travel range and keeping going slightly further, just overcoming the resistance. Start the clock and listen. Is it better or worse? If better keep nudging the pendulum a bit further in the same direction and try again. If it is now worse, move the pendulum in the opposite direction, again moving it past its natural end stop. Repeat the adjustments until the clock sounds right. All things being equal, it should now carry on ticking without stopping. Fascinating. I didn't know that. I'll try it on our clock. Did you get round to trying it - and was it successful? For the very old grandfather clock about 7 feet tall, I tried that. I can't feel any change in resistance as I move pendulum aside as far as the side of the case, which is obviously the limit of its travel. I wonder if the mechanism is so old that it doesn't have automatic adjustment. Maker dates from early 1800s (Barwise Mitchell, Cockermouth) and may not have had any enhancements since then. For the much newer granddaughter clock (about 4 feet tall), the pendulum is about 3" long and consists of a bob that hooks onto a vertical piece of springy metal that nudges the escapement feed sideways. This moves with the same resistance as far as a hard limit, beyond which the escapement release doesn't move any further and the spring metal pivots about the escapement release mechanism rather than about the suspension point of the springy metal which is slightly higher. Pressing and holding the springy metal on one side of its hard limit doesn't seem to alter the neutral rest position of the bob or the even-ness of the tick and the tock. The clock runs for a few minutes and the ticks get fainter and fainter until the clock stops. The hands do go round. The mainspring (and chiming spring) are both fully wound and the mainspring winder definitely won't go any further, so it's not broken and winding forever without tightening the spring. The clock seems to be fairly sensitive about its fore/aft angle. Against the wall it stops but pulled out a few inches it has been running for about ten minutes and the tick sounds more even. I wonder if that's what the problem was. I'll find a spirit level and see how vertical it is fore/aft and side/side. Up to now it's been about your grandfather clock, but now you also mention a granddaughter clock. Regarding the original one, I don't understand Terry Casey's suggestions. Perhaps he's trying to bend the flexible strip at the top of the pendulum, which might have the same effect as tilting the whole clock sideways by a wedge underneath. Making the clock vertical by plumbline or spirit level is no guarantee that it will tick evenly. so I recommend you try my tilting suggestion. -- Dave W |
Pendulum clock runs *fast* in hot weather
In article 3tudnSzq87
, says... For the very old grandfather clock about 7 feet tall, I tried that. I can't feel any change in resistance as I move pendulum aside as far as the side of the case, which is obviously the limit of its travel. I wonder if the mechanism is so old that it doesn't have automatic adjustment. Maker dates from early 1800s (Barwise Mitchell, Cockermouth) and may not have had any enhancements since then. Any clock I've had any contact with has had a slipping clutch arrangement to couple the pendulum to the escapement - just a screw with a fibre pad on the end. Possibly the screw has been overtightened or the pad has 'glued' itself to the escapement? This is easy to get at with a mantle clock because the back door opens, giving access to the movement. You would hve to remove the movement in this case to check and rectify the problem. For the much newer granddaughter clock (about 4 feet tall) . The clock seems to be fairly sensitive about its fore/aft angle. Against the wall it stops but pulled out a few inches it has been running for about ten minutes and the tick sounds more even. I wonder if that's what the problem was. I'll find a spirit level and see how vertical it is fore/aft and side/side. Assuming the wall is true, you can replicate the same effect by loosening the movement fixings and putting suitable packing detween the bottom of the movement and the case. Over a distance of nearly 4 feet, the thickness of the packing will be only a minute fraction of 'a few inches' to create the same angle and shouldn't be noticeable under normal operating conditions. -- Terry --- This email has been checked for viruses by AVG. https://www.avg.com |
Pendulum clock runs *fast* in hot weather
In article ,
says... I did post that on 07/08/18, but unfortunately the title got prefaced by and shows up outside this thread, so maybe you didn't see it. I don't recall seeing it but I don't think there will be any doubts this time! -- Terry --- This email has been checked for viruses by AVG. https://www.avg.com |
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