Ferrule Tool Alignment

I have made more than 200 of the ferrule shrinking tools and have had only positive feedback on their performance, until recently. Paul had borrowed a tool from me and was able to tighten the ferrule fit on several rods. He returned the tool and then later bought one. But the tool he bought did not work as well as the borrowed tool. His description is that the ferrules were “unevenly swedged”. I can accept this description since he has successfully used the borrowed tool.

When the tool was eventually returned, it was obvious that one bearing race had been dragging against an end plate.

Future tool production will be with spacer shims on the two fixed bearing pins.

While waiting for the tool to return, I tried to imagine what the problem could be. I obtained a Fujifilm product called “Prescale” that, when squeezed between surfaces, produces an image of the pressure pattern. I made up a tool alignment procedure that would slightly improve the uniformity of the pressure pattern.

My procedure for realigning your tool if you feel that it is not correct or if you have dropped it:
1. Loosen the two radial screws. Loosen the 3 screws that clamp the two sides together. This only needs to be a quarter turn or so. Tap the edge of one plate with a mallet to be sure that it is not adhering to the spacers.
2. Tighten the two radial screws, bringing the moveable roller into contact with the two fixed rollers. Bring both screws into contact with the bearing pin before tightening either.
3. Re-tighten the 3 clamp screws.
In the photo are before (left) and after (right) alignment impressions made on film strip. There is a slight improvement.

In use, the tool is working on a hollow ferrule that is much more compliant than bearing-on-bearing contact, so pressure is much more uniform than what I have shown in the photo.

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