- Joined
- Jun 5, 2017
- Messages
- 80
Hello Everyone;
I originally posted this in the Atlas threads section, but decided I might be likely to get more replies here, as mine is very much a newbie sort of question:
"New forum member here and this is my first post (and I am a novice at machining). I was given an old Atlas 618 lathe by a friend who passed away and I have taken it down into parts for rebuilding/refinishing. The old countershaft hanger bushings (or bearings, if that is the correct term) were so worn and the countershaft spindle so scored and worn in spots that I ordered a new spindle and bought two bushings from a local bearing supply house.
I pressed in the bushings and rigged up a setup on the lathe using an angle plate and bolts (Chinese 9 X 20) to hold the spindle holes/bushings in line with the lathe axis but the countershaft hanger slipped while boring through the first bushing (which I did by turning the lathe spindle -three jaw chuck attached- with a spindle crank in the lathe).
I stopped there and checked the new spindle in the bushing and it was a tight fit, and "looked" straight, but it is off by about 1/16" when pushed over to the other bushing. In other words- the two bushings will not line up.
So my question is; can anyone suggest a rigid setup for holding this oddly shaped piece (the countershaft assembly) on the lathe cross slide to bore new bushings for the countershaft spindle? I am wondering what kind of fixture they used at the factory for this job. And by the way, I used the hand crank rather than boring under power because I was afraid the reamer would do damage to the part if the part slipped while being bored under power. Thanks for putting up with my long post!"
Also, am I correct in assuming that the right procedure is to press fit the bushings into the part first and then bore the bushings to size for the spindle since they most likely get squeezed down a bit after pressing into the bore?
I originally posted this in the Atlas threads section, but decided I might be likely to get more replies here, as mine is very much a newbie sort of question:
"New forum member here and this is my first post (and I am a novice at machining). I was given an old Atlas 618 lathe by a friend who passed away and I have taken it down into parts for rebuilding/refinishing. The old countershaft hanger bushings (or bearings, if that is the correct term) were so worn and the countershaft spindle so scored and worn in spots that I ordered a new spindle and bought two bushings from a local bearing supply house.
I pressed in the bushings and rigged up a setup on the lathe using an angle plate and bolts (Chinese 9 X 20) to hold the spindle holes/bushings in line with the lathe axis but the countershaft hanger slipped while boring through the first bushing (which I did by turning the lathe spindle -three jaw chuck attached- with a spindle crank in the lathe).
I stopped there and checked the new spindle in the bushing and it was a tight fit, and "looked" straight, but it is off by about 1/16" when pushed over to the other bushing. In other words- the two bushings will not line up.
So my question is; can anyone suggest a rigid setup for holding this oddly shaped piece (the countershaft assembly) on the lathe cross slide to bore new bushings for the countershaft spindle? I am wondering what kind of fixture they used at the factory for this job. And by the way, I used the hand crank rather than boring under power because I was afraid the reamer would do damage to the part if the part slipped while being bored under power. Thanks for putting up with my long post!"
Also, am I correct in assuming that the right procedure is to press fit the bushings into the part first and then bore the bushings to size for the spindle since they most likely get squeezed down a bit after pressing into the bore?