Most visitors online was 1660 , on 12 Dec 2020
Wow...!!!I'm still here, SB and RJ - nothing got my goat, but I had a few blood clots in my cerebrum which put me out of action for a while. Good to see that the Forum seems to be much better and more user friendly
Hi Shutterbug, I have adjusted that eccentric bushing so it does move. I had to adjust it (see earlier posts in this thread). So, my big concern is when I punch the new bushing down inside it will it knock the eccentric bushing out of the plate? That pivot is badly worn so I need to rebush it.As long as the pivot is centered where it used to be and the eccentric bushing doesn't move, you should be fine. You don't want those to turn. They are set at the factory and should never require adjustment.
Yup, I am thinking lack of power, perhaps one of the bushings I didn't smooth it out enough, might be a little tight. I do have the book This Old Clock, it's how I adjusted the pallets after working on the EW. Running still today since yesterday but keeps running fast (amplitude issue?) so I'll keep regulating the bob downward to slow down the beat and this may also fix the problem with amplitude.Your beat analyzer could be picking up an extra noise, like the pendulum leader clicking in the crutch slot.
Try listening to the beat with a beat amplifier. You may detect an extra noise.
You may have the "gain" adjusted too high.
If you have a bent tooth on an escape wheel with say 35 teeth, the uneven beat should show up every 35th tick.
Bent teeth on escape wheels usually come from brute force, not from wear.
If you are seeing an escapement that is normally even and then deteriorates over a period of a half minute or minute, it is a sign of lack of power to the escapement.
With normal operation, how is the pendulum amplitude? If it is rather shallow, I would be suspicious of low power.
Before you adjust the escapement, I would suggest you check the locks and drops.
The best explanation I know of locks/drops comes from THIS OLD CLOCK by David Goodman.
If you do not have that book, let me know and I will PM the necessary pages.
Is the time wheel train free? Could you have a bushing that is too tight and causing power loss?
Have you addressed all loose pivot holes or only the worst ones?
Again, the escapement may be the victim rather than the cause of the problem.
Best of luck,
Thanks Bruce, all good suggestions. Well she stopped now after I did my last adjustment to the bob. Time to take apart and analyze everything again. Oh my. I like your trick for smoothing the pallet surfaces. I have them polished to a very high shine.what i've been doing lately... with good success... is installing a busing and then installing just the one arbor to see how it spins. i tilt the movement back to make sure the gear spins like a greased pig on ice, and then forward. i then check add the next/adjacent arbor in the train and check them together. this can multiple passes, so it's important to be extra extra careful about bending (or worse) pivots. at the end, though, you have a train that should spin with just the slightest pressure on the great wheel.
next step is looking at a the escape wheel to see what you do and don't have.... using magnification. close observation will reveal rough surfaces, spacing issues, non-flat teeth ends, etc. you can CAREFULLY top an EW but have to be careful about changing depthing between it and the verge. another thing i've been doing is taking 4000 grit wet/dry paper and wrapping some around very fine needle files to very carefully polish and smooth out the surfaces of the EW and pallets that interact.... 4000 will smooth without removing much material, and help reduce friction.
btw... just had a banjo clock movement where the minute hand arbor was a noogie too snug coming through the front plate... the clock would run great without the hands, but when the hands were put on it would stop within hours. i used a smoothing broach to barely dress the hole in the front plate, which addressed the problem.
after that... you can look at the interaction of EW and verge... with requisite adjustments for anchor or deadbeats. and, in fact, the banjo clock movement would not fall into beat until i had the drops adjusted perfectly... and now it's happy.