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Bullard VTL drum sequencers?

Bullard VTL drum sequencers?

Bullard VTL drum sequencers?

(OP)
We have a Bullard 56" Dyn-Au-Tape vertical turret lathe (VTL). The automation (lol) was removed long ago and we just use it manually. We are considering replacement of the two drum controllers (drum sequencers) which apparently control acceleration of feed and traverse. I think they were made by GE. A PLC with solid state outputs seems like a durable replacement. There is a fairly complicated mechanical linkage which seems to go between the two controllers, however, and we don't really understand what it is for. Our documentation on this machine is sketchy. Can anybody enlighten us? I'll look around to see if we can purchase a set of proper manuals, too. Thanks.

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