9100
Diamond
- Joined
- Nov 1, 2004
- Location
- Webster Groves, MO
A Hawacheon lathe refusing to run and making growling sounds. It didn't take long to determine that it was losing one phase. The Yaskawa contactor is still available from China with several weeks travel time. Meanwhile, the folks wanted to make parts. The contacts were all burned evenly and by the gospel according to Tom, should not be filed. Maybe so in most cases, but in this one, the contacts were in two rows of fixed ones with the moving contacts on a strip with a jiggle in it that locates in a notch in the Bakelite frame. They move straight up and down with no wipe and are only more or less positioned. You can't count on them meshing the same way twice and sometimes one set was not making an electrical connection. I filed them down to where there were a few tiny spots of pitting left, which left .030" to 040" of silver. Heresy though it may be, the bottom line is the machine runs, which is the name of the game. We will get a new contactor, but I don't expect to have to change it for a while.
Bill
Bill