Also I’m just removing the high spots that happened from galling and running dry. I think as I scrape the bottom it falls deeper which tightens up the sides.Edumacate me...trying to follow your process.
Scraping- removing material- increases the ID of the assembled bearings. Given the bearings are machined to match the OD of the spindle, and you're not increasing the diameter of that part- how can you get 100% contact between bearing surfaces and spindle?
Ok got it. I had wondered whether it was galling at the beginning of the thread. I've seen them damaged at the business end of the spindle from chips getting between them.Also I’m just removing the high spots that happened from galling and running dry. I think as I scrape the bottom it falls deeper which tightens up the sides.
I don’t have a picture of it but it’s a gruesome homemade tool. It’s a file that I grind hole in the middle on a belt sander and sharpened the edges. It’s supposed to mimic a spoon scraper. You make it rainbow shaped and put the ends of the rainbows on the surface to be scraped. I made it very poorly and I’m sure the wrong dimensions but it’s working for me and this is probably the only time I’ll need it. :knock on wood:Ok got it. I had wondered whether it was galling at the beginning of the thread. I've seen them damaged at the business end of the spindle from chips getting between them.
I was lucky with mine. I completely disassembled, cleaned, painted and re-assembled after I bought it- the bearings and spindle looked new. I could barely tighten the bolts finger-tight without binding the spindle but I was told that's a good thing...
What are you using to scrape the concave surface?
The issue that appears to of happened was that the bearings were so egg shaped that I was contacting metal on metal on the sides but still very loose up and down. I am going to see how it does now. The front bearing feels gray with .001 of deflection. The rear starts to snug a little with .001” of defection. I’m going to fool with torquing it less and see. Worst case I will work on that one some more. I think it’s still pinching the sides of the spindle. It’s really close though.That doesn’t look bad, don’t let perfect be the enemy of good. Can always take off more but putting it back on is much harder.
You won’t be looking at this surface, and the spindle should be much harder than the bearing. I’d put it back together and see how it runs.
My old Seneca Falls Star had bearings that looked worse than that and it ran fine. Remember, it should really be running on a film of oil, not really metal on metal.
John