A first post with a really hard question, at least so it seems to me.
Trying to rebuild a cast gearbox. A failed bearing wallowed out the bearing bore-- to egg-shaped. Not having specs. on gear center-to-center, I indicated on the hole assuming very little damage on the "good" side. I bored the housing -through, both sides, for insets. On assembly with new gears a and shafts, one of the bearing pockets has error, of position (center), of about .016"--which resulted in the gears being too tight.
I am thinking about trying to build a bushing with .016" eccentricity (that is, center of the ID offset .016" to the center of the OD) to rotate about to get a good bearing fit. I consider a good bearing fit as minimal backlash but turn by hand with no tight spots felt. The box is a right angle and speedup with three spur gears after the right angle.
Anybody done this?
I am a novice machinist, but lots of years in design and manufacturing.
Trying to rebuild a cast gearbox. A failed bearing wallowed out the bearing bore-- to egg-shaped. Not having specs. on gear center-to-center, I indicated on the hole assuming very little damage on the "good" side. I bored the housing -through, both sides, for insets. On assembly with new gears a and shafts, one of the bearing pockets has error, of position (center), of about .016"--which resulted in the gears being too tight.
I am thinking about trying to build a bushing with .016" eccentricity (that is, center of the ID offset .016" to the center of the OD) to rotate about to get a good bearing fit. I consider a good bearing fit as minimal backlash but turn by hand with no tight spots felt. The box is a right angle and speedup with three spur gears after the right angle.
Anybody done this?
I am a novice machinist, but lots of years in design and manufacturing.