In a previous life, we used to replace the hard bronze bushings that attach the engines to the wing pylons on B747's.
The bushes were fitted using liquid nitrogen to shrink them then the machinists would line bore them in place.
My memory is a bit sketchy as its been 20+ years, but I don't recall the tooling being complex, and was just driven using large right angle pneumatic drill (slow speed and small head for access reasons). I don't recall any mechanical feed mechanism.
Since you're not looking at a high precision application, I don't see why you couldn't get away with making up a long boring bar with a HSS cutter, and mounting 2 guide blocks - one on the outside face of each bearing and simply driving it slowly with an electric drill.
If you make the boring bar so its longer than the whole setup by sufficient length that you can get the cutter to the space in between the faces to adjust for the next cut, and also have a second cutter hole in the bar in the appropriate place to let you bore the other bush without disturbing the setup I think the result should be plenty good enough.
I might be able to help you out with some bronze if you don't already have some. What size are the bushes?
Edit: re-reading you post, I think you were referring to line boring the steel pivot arms themselves. I was referring to line boring bronze bushes.
An option might be to bore the arms independently, fit bushes and then line bore them. As long as you make sure the bushes don't turn in operation the outcome should be the same.
Steve
The bushes were fitted using liquid nitrogen to shrink them then the machinists would line bore them in place.
My memory is a bit sketchy as its been 20+ years, but I don't recall the tooling being complex, and was just driven using large right angle pneumatic drill (slow speed and small head for access reasons). I don't recall any mechanical feed mechanism.
Since you're not looking at a high precision application, I don't see why you couldn't get away with making up a long boring bar with a HSS cutter, and mounting 2 guide blocks - one on the outside face of each bearing and simply driving it slowly with an electric drill.
If you make the boring bar so its longer than the whole setup by sufficient length that you can get the cutter to the space in between the faces to adjust for the next cut, and also have a second cutter hole in the bar in the appropriate place to let you bore the other bush without disturbing the setup I think the result should be plenty good enough.
I might be able to help you out with some bronze if you don't already have some. What size are the bushes?
Edit: re-reading you post, I think you were referring to line boring the steel pivot arms themselves. I was referring to line boring bronze bushes.
An option might be to bore the arms independently, fit bushes and then line bore them. As long as you make sure the bushes don't turn in operation the outcome should be the same.
Steve