BoxcarPete
Stainless
- Joined
- Nov 30, 2018
- Location
- Michigan, USA
I've been using TPG 322 inserts in a boring bar for the lathe for a little over a year now, and they've been solid and reliable for all that time. I don't do all that much machining, so in that time I only went through three inserts. When I went to replace the third one, I dropped the spacer from the boring bar holder right into the damn chip pan. Searched for a while and finally gave up on finding it because the chip pan was pretty full. As I recall, it was only a little triangle of steel slightly smaller than the insert meant to pinch the insert into the holder, so I made a new one.
Now, the next three inserts have broken within seconds of starting a cut on all three corners. Doesn't matter if I baby it, if I do I might get a dozen seconds rather than a couple. Since I changed the insert at the same time as I lost the spacer, I don't have the experience to know if I am just unlucky three times in a row, or if there really is a difference in the way my new spacer holds the tool that's causing them to crumble once I get them within an inch of a workpiece.
For what it's worth, the boring bar is marked "FIRTHITE FS 810F" and I was unable to get any hits on a quick search. Am I SOL and in need of a new boring bar?
Now, the next three inserts have broken within seconds of starting a cut on all three corners. Doesn't matter if I baby it, if I do I might get a dozen seconds rather than a couple. Since I changed the insert at the same time as I lost the spacer, I don't have the experience to know if I am just unlucky three times in a row, or if there really is a difference in the way my new spacer holds the tool that's causing them to crumble once I get them within an inch of a workpiece.
For what it's worth, the boring bar is marked "FIRTHITE FS 810F" and I was unable to get any hits on a quick search. Am I SOL and in need of a new boring bar?