Carriage clock
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By coned do you meanĀ it sits proud of the barrel before you fit the lid?
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Hi all, Might a posit a theory and people can chime in and tell me if I'm barking up the wrong sycamore: If a mainspring is a bit coned and returned to its barrel for reuse, is it less likely to slip when the spring gets to fully wound?Ā For a bit of background: Slava 2427, barrel walls greased with 8217, six dots evenly spaced around each of the barrel walls, then smeared/ spread along the wall before popping the springs in.Ā
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By nickelsilver · Posted
What kind of screwplate are you using? The old Martin ones commonly came in B and L variants. The thread pitch is slightly different between the two, and the full thread diameters tend to be a little off from metric nominal, but the B plates are close enough to metric that they work most of the time. The numbering follows (pretty much) the numbering for stems- at least how stems threads are commonly called out. So a "tap 12" would be 0.70mm. (I can only guess the "tap" size for stems comes from these old plates) Ā These old plates tend to cut some and also form the thread by displacing metal. I think in part because they are low-tech, and also generally a bit worn. So it's good to start quite undersize with your initial diameter, and work up to something that gives a full thread form. There are variances plate to plate too, most likely a combination of manufacturing differences and wear. Ā I haven't tried any modern screw plates, I think they are of questionable origin, and even if marked in metric, probably merit some experimentation like the antique ones to find a good starting diameter. Ā Ā -
Exactly. As Richard says, all good - I helped you by splitting your comment made on an old topic into a new topic of your own in order to help with clarity š Welcome to the forum by the way š
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By RichardHarris123 · Posted
Mark, means he has made this a separate post, he has split it from the old post. You don't need to start a new thread now.Ā
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