I have a Zojirushi BB-PAC20 two-paddle bread maker. It had been working fine for years, but recently it stopped mixing right, leaving huge chunks of unmixed flour. I found that the problem was one of the paddles; it rotated freely all the way around the post it mounts on, so when bread ingredients were there holding it in place, the post would have rotated freely within the cylinder, without rotating the paddle.
Originally the cylinder had a flat side, matching the flat side of the post it mounts on and which rotates the paddle. The paddle's cylinder had been bored completely smooth and round; no vestige of the flat side.
The other paddle had only a tiny nub remaining from the flat side; it would have failed in the same way soon.
My question is, what happened to the metal that had constituted the inner flat side of the cylinder? I'm pretty sure we didn't eat bits of metal, and I never saw bits of metal when cleaning out the pan and paddles between loaves. Where did that metal go?
Tetsujin asked for pictures. Here's the paddle:
This shows the posts at the bottom of the pan that the paddles mount on:
This shows the paddles mounted on the posts: