John,
Still doesn't make any sense as to the thrust bearing where it concerns tapping out of a floating holder.
FWIW, we run a lyndex compression tapper having very light spring pressure in soft materials / small taps...conversely, usually use a bilz unit that's really stiff for larger taps in stuff like 4130 @ 42 rc
I agree. S*it happens? This is AMC after all and things that work don't always make sense. I know you know that. LOL I repair/tune machines the way I shop. Something screwed up with Rigid tapping will lead to the replacement and or tuning of every component in the related system. Bearings, control params - everything. I hate it when CNC's don't do what they should and I'm not a great diagnostician. Plenty of other things to be aggravated with. A CNC milling machine shouldn't be one of them.
We've been getting outside shops to drill and tap our die shoes when they do the 2d machining. I don't know if it was our engineering dept, our their machinists but...
Some die shoes came back with flat-bottom holes (exactly two nominal thread diameters deep), tapped right to the bottom, with the outline of the three flutes of the tap in chips at the bottom. I guess they were using three-flute spiral flute bottoming taps and actually bottoming them out on their machines. (I usually drill to 4x nominal diameter, tap to 3x, and the screw enters 2x). Of course, *I* had to drill them all deeper and tap deeper as we use standard screw lengths, and things don't always mesh. Great time-saving technique...
Regards,
Robin
Fair enough.
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