That was actually an accidental ding!
2 Likes
Titanium
accidental ding
Som’at dunt maff hurr
2 Likes
I have found that the brake pads drag on the bearing. I spent some time trimming the ends down a little bit and it seemed to improve play.l, allowing the bearing to free spin, and remains tug responsive. I noticed this after swapping bearings, as orginal bearing that was in is really noisy, maybe dirtied up a bit with string bits and cork dust, so I’ll try cleaning it before I send this out.
Who is next?
2 Likes
Please report back. It would be odd that they might drag, but I’d believe it. I notice that a couple of my units slow down much faster than others, and manufacturing tolerance of the cork leading to a smaller gap before the bearing might explain it?
In any case, how are you liking it so far?
2 Likes
I guess I never even considered a post-machining HT. I assume it’s an annealing step to soften the Ti since it was work hardened?
2 Likes
Not really soften, no. I’m not trying to change any of the materials properties at all, only relieve the stresses inside the material. A low temperature (~900-1100F) bake for like 1.5-2 hours allows for the material to normalize without changing much about the heat treatment state according to my copy of Vol.4 of the ASM handbook:
I’m not working with plate or anything, but I am removing different amounts of material from different sides of a rather thin wall. So far I’ve noticed an easier time removing vibe, so I think it’s worth it if I don’t have the kind of money or machinery to cut both sides of a yoyo in one go. The distortion is reasonably rather minimal, but if I can cut down the incidence of nail vibe or whatever else might go wrong, it’s worth it to me.
4 Likes
Stress-relieving was probably the better term, but to be pedantic, stress relieving does tend to reduce hardness slightly. 
1 Like
I’m also known to get baked for stress relief every now and again
11 Likes
Holy cow I forgot I still have this PiF!!! Who is next?!
3 Likes
Oh right. I gotta do that still.
The last couple months have DISSAPPEARED. Holy crap.
1 Like
Wait a minute, doc! Are you telling me I just lost 8 months?!
2 Likes
Having kids sure does make it feel that way at times
2 Likes
Im down to give it a go
1 Like