Maybe the sub jaws have a taper? Allowing the part to slip off once the main releases? And/or the bore has taper as well. Does your transfer process use any dwells? Surely... I only ask because you don't feel it would help.
Such a general description of the application you got there. Instead of explaining my thoughts further... Let's just take bets and see how it goes... I say tap failure is likely. Ofc as previously stated idk how stout a speedio is. Other people say 16mm is a cake walk for it. We shall see! Wish...
Sorry to say G15 is not going to run. I'm fairly certain. Alot of codes/features that are standard today either did not exist or where paid options. G13 G15 etc.. were proprietary Fanuc codes back in the day. If you need to helical bore you can long hand it.
Had the pleasure of using that exact machine once apon a time. Had to program using G92. The standard G54-59 WCO was a paid option when those things came out...yikes. You need to write a simple program to start. Comp is turned on at the point that it is being used in the program and back off...
Go as big as your budget and facility can handle. (With-in reason). Big machine can make small parts too. Though with big machines & big parts comes the reality of having to handle those big parts. Got a forklift/hoist etc... Just buy a horizontal with a pallet pool and thank me later.
Assuming it is not an issue of debris interfering with the part seating or clamping...longer dwells are sometimes required at lower clamping pressure. Possibly increase both the main dwell (during unclamp) & especially the sub while clamping.
Intermittent sounds like debris to me.
Have a custom step drill made with the critical dia portion utilizing indexable inserts as the cutting edge. Flip em and rock on. Pretty sure the big boy tooling company's will make it for you.
Course or Fine Pitch? Tapping would be faster for sure! Imo with given parameters... Thread Mill.... It is a one off part anyways. Not sure how stout the speedio is but 20x holes at that dia x 1.0depth and course pitch is asking to scrap a part. If it's fine pitch you should be fine to tap it...
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