Dave B
Banned
Several months ago, I got a call to look at a clock with a Hermle 340-020 movement that had stopped running. The pivots were obviously spalling, and all three trains showed serious signs of wear and the dreaded "black gook". I told the owner he had two choices: either he could pay me to overhaul the movement and install bearings, or he could get a replacement movement.
The client is in his late 80's, and his eyesight is beginning to fail. He told me that many years ago, he had attended some repair classes at National Headquarters, but no longer felt confident to work on his own movements. He did, however, feel he could switch one over, so he opted for the latter.
He obtained a 340-020A movement, and had it in the case, but the chime hammers did not line up, and there was no way to bend them to make them work. He sent the clock to me, along with his old movement, and asked if I could switch out the chime/strike mechanism, so the hammers would line up. I did that, and had the chimes and strike working properly. When I went to test the movement running, to be sure the old chime and strike works were not going to hang the movement up, I found it did not run. The following Monday, I took the movement to a meeting of the Horological Association of Maryland, to see if some other eyes could spot the problem. Several people there felt that I should try oiling under the thrust washers on the escapement lever, and should also oil the escape wheel and fourth wheel pivots. I did that, but it still would not run. Today, I took off the balance machanism, and proceeded to push the lever back and forth by hand, watching to see if there was dirt in one of the pinons. No such luck. The pinons are all clean and dry. So then, I proceeded to look carefully at the pivots, and to scrape around them with a piece of pegwood. The attached photo was taken after I got this gunk from around the escape pivot on the front plate (hidden under the rack). It was taken through the 40X side of my stereo microscoope. As soon as I saw this, I knew that these are plated pivots, and are spalling, so I double checked the letter stamp on the front of the movement., to see if it really is a new one, or was something the client had bought used somewhere. It has a W stamp, which I believe should indicate the movemnt was made this year, and is therefore new. That is most disconcerting.
The client is in his late 80's, and his eyesight is beginning to fail. He told me that many years ago, he had attended some repair classes at National Headquarters, but no longer felt confident to work on his own movements. He did, however, feel he could switch one over, so he opted for the latter.
He obtained a 340-020A movement, and had it in the case, but the chime hammers did not line up, and there was no way to bend them to make them work. He sent the clock to me, along with his old movement, and asked if I could switch out the chime/strike mechanism, so the hammers would line up. I did that, and had the chimes and strike working properly. When I went to test the movement running, to be sure the old chime and strike works were not going to hang the movement up, I found it did not run. The following Monday, I took the movement to a meeting of the Horological Association of Maryland, to see if some other eyes could spot the problem. Several people there felt that I should try oiling under the thrust washers on the escapement lever, and should also oil the escape wheel and fourth wheel pivots. I did that, but it still would not run. Today, I took off the balance machanism, and proceeded to push the lever back and forth by hand, watching to see if there was dirt in one of the pinons. No such luck. The pinons are all clean and dry. So then, I proceeded to look carefully at the pivots, and to scrape around them with a piece of pegwood. The attached photo was taken after I got this gunk from around the escape pivot on the front plate (hidden under the rack). It was taken through the 40X side of my stereo microscoope. As soon as I saw this, I knew that these are plated pivots, and are spalling, so I double checked the letter stamp on the front of the movement., to see if it really is a new one, or was something the client had bought used somewhere. It has a W stamp, which I believe should indicate the movemnt was made this year, and is therefore new. That is most disconcerting.