I am making a 316 tubular part with a thread in the middle,

I am having a problem with the drill on the sub spindle wanting to push the part when 8t gets just the slightest bit dull, the owner complains he gets 3000 pcs out of a drill on his okuma and i only get around 1000 before it starts pushing parts.

The part is too long to bore a step in the collet, but i had an idea to press a stop into the back journal and lock it into the relief holes of the collet with set screws, then the part would have a hard stop to push against when drilling, the only other thing I can see is to flip the part around and do more of the drill and tapping on the main, but that throws the cycle out of balance and im drilling into a hole where there could be a tap( currently all tapping is on sub)

I tried tightening the toggles, but all that accomplished was squeezing the part down more and making the hole barreled

Am I way off the deep end on this one or is there some merit to the idea.

Part is 3/8 diameter 3" long with a m6 thread in the center 1/2" and an m8 thread on one side , and 7mm clearance on the other

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