Can every part use a vibratory bowl feeder?
No universal fit is implied. Geometry, separation, orientation, surface condition and the required presentation must be reviewed. Send representative samples and identify variants before confirming the feeding method.
Does the cell drill the starting hole as well?
Only when that operation is included in the proposal. State whether the part arrives pre-drilled or needs drilling, chamfering and tapping. A rotary indexing layout may be reviewed when several successive operations are required.
What should an automatic feeding demonstration prove?
Agree the incoming condition, continuous observation period, interruptions to record and inspection of identified output parts. Keep feeding observations linked to machining results; successful orientation alone does not demonstrate thread acceptance.