You are taking the last .0015 X 8.500 to finish with emory ? Apparently, you are not in a hurry.We have an old leblond af work, 1.500 2024 getting turned down to 1.375 over 8.500 inches, .006 diameter runout from tailback to jaws. I actually take the center out for the last pass of about 5k to get it down to .0015ish then finish with Emory. It makes things difficult lol.
It actually doesn't take that long, maybe a few minutes at the most. I hit it with 180 then 320 and finish with green scotchbrite. I use wd40 to help it cut, spin around 800 rpms.You are taking the last .0015 X 8.500 to finish with emory ? Apparently, you are not in a hurry.
I'd blame Dr Georg Schlesinger He largely wrote the standard of inspecting machine tools. Which went on to become the DIN standard, and many other agencies followed, including JIS.Okay- I know if the tailstock on your lathe is not centered on your spindle in the X axis you will turn a taper. If it is high or low will the same thing occur?
Ya, emory can be a pretty fast finishing tool provided the mat isn't too hard. With a lean back into the emory roll it will remove some mat fast. I wouldn't want to do it all day, but for a 1-2-3 off, easier than comping the tool and trying to make it cut the last .001" IMOIt actually doesn't take that long, maybe a few minutes at the most. I hit it with 180 then 320 and finish with green scotchbrite. I use wd40 to help it cut, spin around 800 rpms.
ExactlyYa, emory can be a pretty fast finishing tool provided the mat isn't too hard. With a lean back into the emory roll it will remove some mat fast. I wouldn't want to do it all day, but for a 1-2-3 off, easier than comping the tool and trying to make it cut the last .001" IMO