The boring bar is long enough to go through the other end.This is not necessary for the alignment as all the support bearings have been set in line. I do it mainly to spread the load while machining over as many bearings as possible.You may have noticed that the spiders are mounted in half circle shells that I tack weld inside.You can't see what you are welding,its done by feel so the welds tend to be a bit dodgy.So I don't like to put all my trust in one bearing
The boring bar is long enough to go through the other end.This is not necessary for the alignment as all the support bearings have been set in line. I do it mainly to spread the load while machining over as many bearings as possible.You may have noticed that the spiders are mounted in half circle shells that I tack weld inside.You can't see what you are welding,its done by feel so the welds tend to be a bit dodgy.So I don't like to put all my trust in one bearing
Steve,I'm not sure about the wire formula. The wire attachment comes with a chart so I just use that.
The workshop it at has a rule,no climbing over 6 feet with out scaffolding and harness. When I told them I needed to get up on top they decided not to do the top bores. So I told them about the 4 thou Cat alignment tolerance and told them they are welcome to do it any way they want but if I do it,the top holes will be done.So its now scaffolded up waiting for me.
This is a Komatsu WA 700 rear axle pivot I bored a while back. It was simple enough. I machined up a lining up jig that bolted up to the bolt circle of the tractor.Made it a little undersize and used jacking bolts to dial it up centre. It was a bit cramped working under there but it finished up OK. The bores take nylon bearings which seem to wear out bores quicker than anything else.