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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Clock with oscillating spring as "pendulum"
My wife has a small clock, of sentimental value only, which has a spring
with a weight on the bottom which oscillates vertically to operate the escapement. It runs for a couple of seconds but the movement that the spring exerts on the escapement quickly decays to a point that the escapement no longer operates because the claws do not move far enough to release one tooth at a time. I presume the escapement is not providing enough "driving force" to keep the spring oscillating. https://i.postimg.cc/50Kt1njT/20201013-131035.jpg The spring has a peg trapped between its coils which causes arm 1 to move clockwise/anticlockwise about a pivot as the spring oscillates. This causes two claws to operate the escapement. There is a second arm, arm 2, but that plays no part in the escapement - it just operates a moving bird on the clock face! The clock used to work perfectly, but has been in storage for several years because we couldn't find a key to wind it until recently. I can't see anything that looks obviously bent or out of place. The main spring is fully wound. The coils of the "pendulum spring" are roughly evenly spaced when the spring is extended - one coil of the spring is not more stretched than another. The spring is securely attached at the top, so it can't have rotated to move the peg onto the wrong turn of the spring, which would cause the escapement claws to be unbalanced: it takes about the same amount of movement of arm1 either side of its neutral position to release either the upper or lower claw. If the clock is placed face down so there is no load on the spring, the spring can be manipulated so the escapement oscillates very rapidly and the gears turn, which proves that the mainspring is driving the escapement and there isn't excessive bearing friction. Any suggestions? |
#2
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Clock with oscillating spring as "pendulum"
"NY" wrote in message
... My wife has a small clock, of sentimental value only, which has a spring with a weight on the bottom which oscillates vertically to operate the escapement. It runs for a couple of seconds but the movement that the spring exerts on the escapement quickly decays to a point that the escapement no longer operates because the claws do not move far enough to release one tooth at a time. I presume the escapement is not providing enough "driving force" to keep the spring oscillating. https://i.postimg.cc/50Kt1njT/20201013-131035.jpg The spring has a peg trapped between its coils which causes arm 1 to move clockwise/anticlockwise about a pivot as the spring oscillates. This causes two claws to operate the escapement. There is a second arm, arm 2, but that plays no part in the escapement - it just operates a moving bird on the clock face! The clock used to work perfectly, but has been in storage for several years because we couldn't find a key to wind it until recently. I can't see anything that looks obviously bent or out of place. The main spring is fully wound. The coils of the "pendulum spring" are roughly evenly spaced when the spring is extended - one coil of the spring is not more stretched than another. The spring is securely attached at the top, so it can't have rotated to move the peg onto the wrong turn of the spring, which would cause the escapement claws to be unbalanced: it takes about the same amount of movement of arm1 either side of its neutral position to release either the upper or lower claw. If the clock is placed face down so there is no load on the spring, the spring can be manipulated so the escapement oscillates very rapidly and the gears turn, which proves that the mainspring is driving the escapement and there isn't excessive bearing friction. Any suggestions? This is the clock https://www.youtube.com/watch?v=dEwiuIjWXts - a standard German mechanism, apparently |
#3
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Clock with oscillating spring as "pendulum"
NY explained on 13/10/2020 :
The clock used to work perfectly, but has been in storage for several years because we couldn't find a key to wind it until recently. The lubricant will have become sticky, it will probably need to be cleaned and re-oiled. |
#4
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Clock with oscillating spring as "pendulum"
On Tue, 13 Oct 2020 21:16:14 +0100, Harry Bloomfield wrote:
The clock used to work perfectly, but has been in storage for several years because we couldn't find a key to wind it until recently. The lubricant will have become sticky, it will probably need to be cleaned and re-oiled. +1 -- Cheers Dave. |
#5
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Clock with oscillating spring as "pendulum"
On 13/10/2020 21:45, Dave Liquorice wrote:
On Tue, 13 Oct 2020 21:16:14 +0100, Harry Bloomfield wrote: The clock used to work perfectly, but has been in storage for several years because we couldn't find a key to wind it until recently. The lubricant will have become sticky, it will probably need to be cleaned and re-oiled. +1 + another 1 |
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