-
Recently Browsing
- No registered users viewing this page.
-
Topics
-
-
Posts
-
By Latetothegame · Posted
Here’s a couple pics showing how rough the case and crystal were. -
By HectorLooi · Posted
No. Just the opposite. Cannon pinion not pressed all the way down, so the pinion leaves were just glancing off the teeth of the minute wheel. -
-
Hello everyone- I have a 0S “Lady Waltham” model 1900 movement which I’ve just completed a rebuild of the balance- new staff to replace broken pivots and new hairspring to replace mangled one. The hairspring is a NOS 20277 “light” rather than the preferred “medium” but that’s all I was able to source. I was able to ensure that the new hairspring is reshaped slightly to correct the radius for the overcoil segment affected by the regulator pins, and have also made certain that the hairspring is not interfering with the balance cock or balance arms, and is breathing relatively evenly all around so that coils aren’t touching each other in operation. In other words, everything looks pretty good and the balance appears to oscillate reasonably well. When I put it on the grapher, it fails to lock on if I let it auto-determine the rate. If I manually set it to 18k, it runs a little longer before it gives up and tries to lock on again. I’m able to get it to briefly show an amplitude in the 180+ range and a sub-1ms beat error. When I manually time the movement against a quartz watch I can see that it’s running about eight seconds slow per minute. Regulator position doesn’t make a significant difference. I am surprised that it’s that slow and with a pre-studded NOS hairspring it doesn’t seem like it should need to be shortened that significantly in the first place to get into the right range, should it? At this point I’m not sure whether the failure to lock on and get a stable timing reading is due to the excessively slow operation or whether there’s another cause within the escapement, but I don’t see anything else obviously wrong in the pallet action the impulse jewel interaction with the fork, interference from the single roller guard pin, or anything like that. Any thoughts or guidance as to the possible effects of the light hairspring on the timing or other sources of the failure to get stable timing on the machine would be greatly appreciated! Thanks- -
By RichardHarris123 · Posted
If one of the wheels has moved out of position, then tightening the screw may of broken a pivot.
-
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.