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Subspindle collet chucks and parting off at the sub face

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QTN-100MSY with VDI 40...we're considering a switch to collet chucks on both spindles. Nearly everything part is bar work, picking off with the sub. So far, we've been doing it with the B206 / B205 chucks with relieved jaws, looking to switch to S20 / S16. The trick is getting a cutoff blade in between the two collet chucks down to X0 close to the face of the sub.

Does anybody know of a tool block manufacturer and/or cutoff tool combination that allows some descent reach to get between the collet chuck faces? Something like a left hand cutoff blade or a low profile tool block with a protrusion just for fitting in between chuck faces?

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