Hello all,
I just brought home BTC-1 serial number 175. I’m not new to Bridgeports, but I am new to this head. Can anyone explain how spindle speeds are obtained? I realize there is a VFD, but are there three ratios? The motor nameplate lists three RPMs. What happens in the shoebox? And like everyone else, I would love to get my hands on a set of manuals, or at least the service manual. All of the previous links pointing to manuals result in dead ends now. I have access to an industrial grade scanner, so I would gladly scan in and make available to everyone.
Thanks,
Mike
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