I'm back with a question, a problem I've been experiencing. Maybe you can help, and I really appreciate it if you can. When I'm cutting with my lathe and maybe moving right to left I sometimes bring it back to the start position without moving the cutter away expecting maybe a little drag or some fine cutting but what often happens is the cutter seems to dig in and on the way back it cuts more than it should and messes up my work. I've tried to see if there is play in various components but this still seems to persist. Have you ever heard or experienced this? Thanks.
I think what you're describing is spring cutting. It's caused by deflection (usually of the workpiece). It's actually pretty common for manual machinists to do a "spring pass" on their final finishing cut. This is to get any metal left uncut when the deflection occurs. I've noticed that I end up with a taper when I turn a long diameter, not from any sort of misalignment, but simply from deflection caused by long stick-out, or overhang. It will be fatter at the end because the workpiece is less stiff, meaning more deflection, and less material removed. The closer to the headstock you get, the more rigid it becomes, and the tool can cut the material. Really hope this helps and good luck!
just a remidner. i dont know how your getting enough "precision" for interferance fit when measuring with calipers. Especially for the inside bore. Get your self a set of micrometers. Or at least get the proper bore size from the spec... you cant get close enough with the flats of the caliper inside jaws.
Exactly what I was looking for, an explanation and real life example of fitting a bearing. The filing and oversize info helps me understand.
I'm back with a question, a problem I've been experiencing. Maybe you can help, and I really appreciate it if you can. When I'm cutting with my lathe and maybe moving right to left I sometimes bring it back to the start position without moving the cutter away expecting maybe a little drag or some fine cutting but what often happens is the cutter seems to dig in and on the way back it cuts more than it should and messes up my work. I've tried to see if there is play in various components but this still seems to persist. Have you ever heard or experienced this? Thanks.
I think what you're describing is spring cutting. It's caused by deflection (usually of the workpiece). It's actually pretty common for manual machinists to do a "spring pass" on their final finishing cut. This is to get any metal left uncut when the deflection occurs. I've noticed that I end up with a taper when I turn a long diameter, not from any sort of misalignment, but simply from deflection caused by long stick-out, or overhang. It will be fatter at the end because the workpiece is less stiff, meaning more deflection, and less material removed. The closer to the headstock you get, the more rigid it becomes, and the tool can cut the material. Really hope this helps and good luck!
@@mattruth7109 thank you very much for a nice explanation.
just a remidner. i dont know how your getting enough "precision" for interferance fit when measuring with calipers. Especially for the inside bore. Get your self a set of micrometers.
Or at least get the proper bore size from the spec... you cant get close enough with the flats of the caliper inside jaws.
I don't think the caliper inside jaws have "flats." This looks pretty precise to me.