Back Up Next

Repairs and adjustments. The movement as received had several shims inserted into areas of the frame. Apparently in an effort to alleviate friction where the prior repairer was unable to properly service the the movement and bring it back to it's original operating tolerances. These were crude efforts in the first three photos. Also note in the 2nd photo the etching on the top of the frame indicating 'N' in an effort to identify how parts should be put back together. Other instances of this inexcusable practice are noted here. The last photo shows a shim that was neatly made and not noticeable when assembled. It turns out that this one and only shim was necessary to provide proper depthing of the main spring barrel from the second wheel in the going train. Eliminating this shim caused lock up between these two wheels. All other shims were unnecessary after the movement was cleaned and adjusted.

                          Gourdin miniature r (7).JPG (1030844 bytes)     Gourdin miniature r (14).JPG (998124 bytes)

                          Gourdin miniature r (15).JPG (936352 bytes) Gourdin miniature r (76).JPG (1078529 bytes)

The remontoire weight had obviously had additional mass added to it at one time. Although this was done in a fairly neat workmanship manner, I wanted to see if the original weight's mass could be enough to drive the escapement. Additional weight on this part could overdrive the escapement and will definitely cut the duration that the clock will run on a winding. My guess is, that the prior repairer was not knowledgeable enough to correct problems leading to excess friction in the wheel train and used this route to 'cure' the problem. The first photo clearly shows the additional material added resulting in just over 25% additional mass over the original. Total weight was 0.23 oz. This number shows just how precise this movement is to be able to run on such a small (yet increased) remontoire weight.

          Gourdin miniature r (53).JPG (904591 bytes) Gourdin miniature r (54).JPG (1146938 bytes)

A dummy weight consisting of lead wool mounted on a toothpick was used to test different weights. These were logged as weight was decreased until the point that the remontoire failed to drive the escapement. We are talking incredibly small amounts here. Starting at 0.23 oz, I went to 0.21, 0.19 0.17 and at 0.16 it failed. Each test had to last at least 24 hours to be sure the wheels in the going train past the barrel had all rotated in relation to each other at least once. For a safety margin I stuck with 0.20. The position that the dummy weight occupied was slightly closer to the fulcrum than would be the real weight as it hung from it's thread so this also added to the safety margin since the weight's leverage is increased as it moves away from the fulcrum point. In the end three quarters of the added mass was eliminated. It is possible that the clock may have run with all of it removed, but I did not want to take it too close. The result is that the clock will run an additional amount of time time equal to two turns of the going barrel, about 4 extra days.

Gourdin miniature r (55).JPG (978823 bytes) Gourdin miniature r 77.jpg (149439 bytes)

Back Up Next