After some testing it became apparent that an Index Plate was necessary to hold the selector arm in place once it has been extended.
It was important that the Index Plate was in line with the position of the balls in the upper & lower track. This is so the vertical piece on the selector will pass into the appropriate slot on the Index Plate.
Tabs were soldered drilled and tapped (2-56) onto the lower track to provide mounting for the Index Plate.
I didn’t want to solder the Index Plate directly to the lower track incase I needed to change something on it.
If there is one thing I have learned during this project it is that you have to keep your options open. It’s kind of like life, never box yourself in.
The index was necessary to establish the location of the lower gate to release the balls into the hour striker section.
Once mounted and tested, the assembly was reinstalled into the clock to check for clearances.
Things are getting tighter in that area and it is important to stay on top of it.
Some progress since the last post, albeit slow.
The supports for the selector assemble have been installed complete with bearings upper and lower. The trick was to get the angle right as the selector has to follow the slope of the magazine. (Photo-1)
Because I’m using a jig to work on this assemble, it is important to duplicate the mounting hole on the main clock.
The selector arm has been extended to be in the upper track of the magazine. This will allow it to be stopped by the balls in the upper rack when the cam drives it. (Photo-2)
Once it contacts the balls in the upper rack, the selector plate will cam out enough to place the lower extension into the balls on the lower rack.
This will separate the same number of balls as there are in the upper rack. Once I get a few more parts made, I’ll be able to make a movie of that action.
By separating the balls on the lower rack, I will be able to release that number into the hour striker section.
The release plate that kind of looks like a saw will be used to detect when the selector cams out and then release the balls on the lower track. (Photo-3) The plan is to have another cam that operates the ball gate for the lower track..
When the selector cams out it allows a pawl to engage with the teeth on the release plate and be carried around by the cam. That action will only happen when the selector has moved.
Still needs to be made is the ball release gate and associated parts that will work with the release plate.
That’s for another day.