Have a job coming up here where we are boring some castings. The bore is 4.00 inches and the cast bore now is 3.625. It is 10+ inches deep. We may use a hi-feed mill and helical mill it, but will need a long extension for the shell mill. Who offers these long shell mill extensions? I know I have seen them. Our other option is to buy a boring bar and I think this may be the way to go. Who offers good rough/finish boring bars for milling machines? Thanks for your help on this one.
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