How do I keep night shift productive?

Walk into a machine shop at two o'clock at night and the picture is often the same. Two lathes are cutting. A VMC stands with its door open and an alarm on the screen. Its operator is waiting for the setter, who went home at ten. Nothing is wrong with the machine. The night simply has nobody allowed to fix a small problem.

• Nobody cleared to act. A chipped tip, an expired tool-life counter or a drifting bore stops a spindle. The only person allowed to touch an offset is asleep.
• The crib is locked. Spare tips, drills, taps and the bore gauge sit in a cupboard whose key travelled home with the day supervisor.
• Handover is a few words at the gate. The night operator never hears that tool twelve is nearly worn out or that the second fixture has a weak clamp.
• Tiredness after three. Attention dips, yawning operators skip gauge checks, a chip conveyor jams unnoticed, and the count rises while the rework bin fills.
• The newest people get nights. Seniors refuse the shift, so the hours with least supervision also have least skill.

Make sure every machine running at night has two or more signed-off names against it. Give one night lead the authority to take small decisions. Prepare the night's work before the day shift leaves. Review results by shift every week, and pay a night allowance that people accept as fair. None of that is difficult on its own. The hard part is doing all five, every week, without letting one slip.

1. 1

   Clear two people per machine for nights

   Use the skill matrix to see who may run each lathe, mill or EDM alone. Where only one name appears on the night roster, train a second person before you add more night work. A machine with one cleared person is idle whenever that person is off.

2. 2

   Name a night lead and write the limits

   Pick a senior operator or a junior setter. List what they may do without calling: change an insert, nudge a wear offset within a stated amount, move to the next job in the queue. List what always needs a call, such as editing a program or releasing a doubtful first piece.

3. 3

   Stage the night during the day

   Before the day setter goes, the night's programs should be proven and first pieces approved. Inserts, drills and gauges for each job go into a labelled tray at the machine. A night that opens with a hunt for the bore gauge has lost its first hour.

4. 4

   Hand over on one page at every machine

   Part number, count made, tools close to end of life, offsets changed and why, fixture trouble and the next job. The night operator reads and signs before starting. The morning setter reads the night sheet before anything else.

5. 5

   Look at the night every week

   Compare good parts, scrap and idle hours by shift. Ask why each idle hour happened. Patterns appear quickly: the same machine waiting for the same setter, or rejections bunching after three.

People on nights are not lazier. They are tired at predictable hours. Put the long, steady cycles in the drowsy hours and the fiddly jaw or fixture changeovers before midnight. Fix the gauge check to clock times, so it survives when attention slides. A hot meal or chai at a set hour, a drop-off van at shift change and a lit, swept walkway to the gate do more than a speech about discipline. Rotating people off nights on a published pattern also helps, so the same few are not stuck there for months.

If the night allowance is small or paid late, your strongest people find reasons to work days. Nights then fill with whoever cannot refuse. Set the allowance by policy, not by bargaining, and pay it with wages on the same cycle. Tie any shift bonus to good parts rather than spindle hours, so a night that ships scrap never earns more than a careful one. A pay benchmarking exercise for turning shops shows what neighbouring units offer for the same work.

Not always. A small shop can run nights with a capable night lead, a written call-out rule and a setter on call. The call-out rule says who to ring for what, in which order, and the fallback when the phone rings out. Paint it on the wall by the time office, not in someone's phone.

Some cycles, such as long wire EDM cuts, run unattended through the night. That only works if the start of each cut is checked and signed, and someone reviews every failure in the morning. Our spotlight on overnight cuts in wire EDM shops covers that case, and the EDM shift and leave notes describe the roster side.

Print last month's output by shift. Mark every hour a machine stood idle at night and write the reason beside it. Then count, per machine, how many names are signed off on it after dark. Those two lists tell you whether your problem is cover, authority or preparation. The pattern post on shift cover depending on who turns up goes deeper on cover. Our page on lathe, mill, grinder and EDM employers sets nights alongside setter scarcity and grade ladders. Our rostering and shift rules work puts rosters and allowances on paper.