Hello! I've been lurking for a couple of months, and learning a lot. I'm amazed at how many of my google searches end up pointing me to this forum. Thanks for being here, and for creating such a rich, honest collection of knowledge and advice.
I'm looking for suggestions on freeing a stuck vertical shaft on a machine I'm rehabbing. It's labeled as a Tacsew T206RB, badged "SUPREME." ie, it's a Taiwanese 206RB/8BL. It has push-up reverse, and from what I've learned it looks like Consew 206RB machines, before they added the top oil reservoir and wick that heads out to the needle end. My guess is it came from Chikon Industrial Sewing Machine in New Taipei City, but I'm more familiar with the Chinese knitting clone business than sewing, so that's just a guess.
It's been very lightly used, and has none of the wear and scoring I've seen on production machines. The story I was told was that it was stored in a shed for 25 years, abandoned. It's cleaning up very well, but the vertical shaft won't budge. I've pulled the grub screws on the lower bevel gears, and the lower shaft spins fine, and the upper shaft will move slightly all along its length if I try to turn the handwheel gently, but the vertical shaft is tight. The catch is that I can't reach the set screws on the upper bevel gears, because of how the shaft is positioned, and I don't want to damage the upper gears by applying more force.
I've been oiling it and letting it marinate, but other than that do the machine folks in the crowd have any suggestions for freeing the shaft?
Thanks! -- Rick