Adjusting the rotate character selection on the 1053 - part 5

FIRST ATTEMPT TO GLUE RIGHT MARGIN LEVER FAILED

The glue didn't take, the pieces came right apart. I will need to use some kind of brace that fits over the flat surfaces, giving a larger area for the glue to adhere. A bit of thinking will be required.

MORE INVESTIGATION OF ROTATION ISSUE

Precise measurements are necessary to determine if the problem is caused by wear on the cams reducing their lift, or by incorrect placement of the bail, or by incorrect placement of the whiffle tree. If I can understand what is working incorrectly I have an excellent chance of fixing it. 

The ultimate goal of the whole mechanism is to pull the rotate tape the exact distance necessary to turn the ball to the +5 position, or to release the tape by the exact distance to let the rotate spring turn the ball to its -5 position. This is not happening properly at present.

The adjustments are for the most part getting the detent to slide into the tooth on the type ball at the ideal location so that it locks the ball on the desired rotate point, but all of those tweaks depend on the ball inherently turning the right number of degrees in each direction. That in turn requires that the rotate pivot arm moves far enough to the left and right that it swings the ball through that entire range of rotation. 

I could remove the rotate pivot arm, cut the notch where the pushrod mounts so that it can be adjusted closer to the pivot point of the arm. That would generate more leverage to turn the ball further. However, I am loathe to modify the machine until I fully understand the cause of the current problem and have exhausted all native means of correcting it. 

Notch in bottom of pivot arm

SUSPICION OF BALANCE LEVER ADJUSTMENT

I realized that the balance lever is the only part of the mechanism which determines the relative distance moved between the positive and negative rotation extremes. I tested more closely and indeed this is not set up properly.

I first worked on the balance arm from the donor typewriter to be certain I understood the process of changing the balance. The picture below shows the nut that is loosed (yellow arrow), the notch that a screwdriver can twist the two sides apart or closer together (green arrow). The two parts can be moved apart or pushed closer together (red and blue arrows show left-right movement). 

On the 1053, the -5 rotation lever was pulling the arm from the right side more than a +5 selection was pulling down on the left end. Therefore, we needed to move the parts together, which I did. The result was a much more consistent twist amount in both negative and positive 5 rotations. 

The ball was almost but not quite correct at this point. When I return to the shop I should be able to dial in the proper selection and wrap up this subtask.