Thursday, May 31, 2007

Cleaning & Oiling A Bulova 10BC Movement

One of my favorite watches took a nasty spill and the upper pivot on the balance staff broke.

After acquiring another 10BC movement from Larry Foord, I proceeded with a pretty standard cleaning and oiling.

I was pleased to see that the replacement movement was a 17 jewel 10BC, so I swapped it for my 7 jewel 10BC.

The new movement was missing the barrel ratchet wheel, the hour wheel, the canon pinion and the upper pivot on the pallet arbor was broken, but the balance and hairspring were perfect.

After disassembling and hand cleaning the new movement, I separated the parts.


After the cleaning process, I used wooden skewers to clean out the jewel holes, being careful not to crack one. I also removed the cap jewel for the pallet arbor lower pivot and cleaned that.


Here are pics of the pillar plate:


And the dial side:


To avoid smudges I did a preliminary wiping of the bridges and plate with Rodico. A more though cleaning would happen after the movement is assembled.


Here we see the damaged pallet fork and arbor from the replacement movement. The missing pivot is quite obvious, even on so small a part.


Here is the first step in assembly; the pallet arbor and fork (PA&F) are set in place and the PA&F bridge is carefully set onto the upper pivot.


Here, all the pics are from the 7 jewel movement. As I got going on assembling the 17 jewel movement, I became careless and didn't take any pictures. So the 7 jewel will have to sit in for the 17 jewel movement. The layout is identical, however.

Next, the escape wheel is put in place.


Then, the fourth wheel--the gear which moves the sub-second hand.


Next, the third wheel--the gear which moves the minutes hand.


And lastly, the second wheel, or center wheel--the gear which moves the hour hand.


Here the bridge has been replaced. On a personal note, I've noticed it's far easier to place the bridges down on high jeweled watches. These seven jewel movements are tough, because there isn't a colour contrast between the pivots and holes, like a jewel will give you.


Here the barrel is placed in position.


And here the barrel bridge in put in place.


Here, the click spring gave me some grief on the 17 jewel movement. The click had jumped the spring, so I had to remove the click, so as to get the spring back behind the stud located on the underside of the click. Thirty minutes later, I was victorious and the click spring was my defeated enemy!


To crush your click springs, see them driven before you, and to hear the lamentation of the winding clicks!

Lastly, the balance goes into place.



This video may be downloaded for free from Rapidshare

http://rapidshare.com/files/34464677/Mov00694.mpg

Here is a video of the 17 jewel movement ticking along nicely.




This video may be downloaded for free from Rapidshare

http://rapidshare.com/files/34464322/Mov00679.mpg

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