Looking for a safer, stickier way to teach new hands how to verify thread pitch on the lathe without fingers drifting near a coasting chuck. I’m using wires and a thread mic with the spindle locked and a hard stop on “hands off until zero RPM,” but a couple of apprentices still cheat the rule - what demos or drills have helped you ingrain the habit and keep quality high?
Make it a physical interlock: tether the wires/thread mic to a lanyard that only releases when the spindle‑lock pin is engaged, so they can’t even pick the tools up unless the chuck is pinned at zero. Do a 60‑second demo with a bright zip‑tie on a jaw and a glove on a stick to show what coasting really does, then require a spoken call‑and‑point - “lock, zero, hands” - before every measure. If coast time’s the culprit, add a foot brake or VFD DC‑injection stop so the habit isn’t fighting impatience.