OK, I know there are many threads on the pros and cons of smooth broaching, but in my searches on the Forum, I've only found a little on the pros and cons of smoothing new bushings that are otherwise fine as is. If you do use a smooth broach, the broach should be oiled with the same oil you plan on using with the movement, and the method described by David LaBounty, in his article titled "Burnishing" is to wallow the tool in the bushing: Burnishing. From the various threads I've read, it almost seems to be a matter of personal preference regarding the science whether or not to broach and whether or not the bushings are new or original. Any articles that might help me to make a final decision on which direction to go?
Presently, I only broach new bushings when it is necessary to make the ID large enough to accommodate the pivot properly (5 degrees of movement). This happens when I have to choose between a bushing who's ID is slightly too small as opposed to the next size up which turns out to be too large. Presently I do not smooth broach new bushings that require no adjustments. I read from several clock makers that they never broach at all and seem to be happy if the bushing ID is "close enough" without binding.
As my experience and knowledge in repairing clocks progresses and grows, I especially think it is appropriate to broach a new bushing (as outlined in the previous paragraph), especially the case when it is necessary to file and polish the pivot due to uneven wear and ridges. Any thoughts?
Presently, I only broach new bushings when it is necessary to make the ID large enough to accommodate the pivot properly (5 degrees of movement). This happens when I have to choose between a bushing who's ID is slightly too small as opposed to the next size up which turns out to be too large. Presently I do not smooth broach new bushings that require no adjustments. I read from several clock makers that they never broach at all and seem to be happy if the bushing ID is "close enough" without binding.
As my experience and knowledge in repairing clocks progresses and grows, I especially think it is appropriate to broach a new bushing (as outlined in the previous paragraph), especially the case when it is necessary to file and polish the pivot due to uneven wear and ridges. Any thoughts?