He could swap a two-plate tool faster than anyone on the floor, clamp bolts, water couplings and hot runner plugs included. So when the B shift lead resigned, the owner handed him the job one Friday evening. By the following Monday he was still under a platen with a spanner while three presses stood idle waiting for him to approve first-offs. Two packers were arguing about who had taken the table by the cooling fan. A leave request sat unanswered on his phone.
Few patterns in plastics are as widespread. The best operator is promoted because he is fast. Nobody teaches him to run people. Targets, complaints and conflicts arrive on his desk with no support. Some cope by doing everything themselves. Others cope by shouting over the granulator.
What it looks like by the third month
- The lead dives in to free every jammed ejector pin, so nobody else on the shift learns how.
- Every first-off waits for his signature, so presses idle with the mould warm and the hopper brimming.
- Operators stop mentioning problems, because the reply is a sermon.
- Overtime and night duty flow to his old cronies, or get dumped on anyone too meek to argue.
- Squabbles between the packing table and the checker reach the plant head unresolved.
- Leave is granted or refused over the phone with no record and no consistency.
- Former workmates now reporting to him quietly shrug off instructions.
Look at a single shift start to see why. The planning office sends a list of moulds, colours and quantities. The lead must decide which press takes the four-cavity cap tool and who loads the dryer two hours ahead. He must also pick who trims, who packs and which helper is still too green for the robot cell. Nobody coached him in those calls, so he makes them in the order people shout.
What it costs
Injection moulding operator attrition often tracks the shift lead more closely than the wage. A shift that feels unfair loses its steadiest people first, either to another shift or to the next estate. The press also loses its quickest pair of hands, so mould changes slow down. Safety short cuts creep in when the lead is the one rushing: a safety gate held open, a purge done without the nozzle guard. Many promoted leads, worn out by month six, plead to return to the machine or quit altogether. Then the plant has lost both a supervisor and a setter.
Why it keeps happening
- Promotion is the only rung on the ladder. A gifted setter who wants a bigger pay packet has nowhere to climb except into supervision.
- Nobody wrote the job down. The new lead is simply told to 'keep the shift running' and pieces together the rest alone.
- Selection rewards the rescue. Owners pick whoever revived the last breakdown, not the person colleagues quietly consult.
- The boss counts pieces. The production manager asks about output per hour and rejects, never about grumbles, favouritism or transfer requests.
- Training feels like an indulgence. The press must run, so the new lead learns by fumbling on real operators.
Start with the leads you already have
Write the name of every current shift lead on one sheet. Beside each, note how they were picked, what grooming they received and how many operators resigned or asked to switch away from their shift in the past year. Add any grumbles that reached you. A lead with high exits and no preparation is the first place to act. The pattern indicts the support they were given more than the person.
A fix that starts before the promotion
- 1
Describe the shift lead's job on one page
Running the start-of-shift huddle, allocating presses and tables, approving first-offs, handover, rosters and overtime within the rules, leave requests, the corrective conversation and when to escalate.
- 2
Open a technical track
A senior setter or process specialist grade carrying a separate pay increment, so skill can be rewarded without forcing a reluctant setter into supervision.
- 3
Try candidates as acting leads
Give a handful of people a few shifts each in charge. Ask operators afterwards whom they would approach with a problem.
- 4
Teach in short slots
Half-hour huddles at the changeover across the first three months, one theme at a time: allocation, feedback, fair rosters, defusing a quarrel, leave.
- 5
Give every new lead a mentor
The production manager or an experienced lead from another shift meets them weekly for twenty minutes to go through what happened.
- 6
Hand over simple rules
A roster pattern, an overtime rotation list and a leave rule on paper, so the new lead is applying a system rather than inventing one.
- 7
Review at ninety days
Look at exits, transfer requests, rejects and safety notes for the shift, and hear from two or three operators, before confirming the role.
Keep the speed, though. The knack of reading a short shot from the sound of the screw, or smelling a scorched heater band before the alarm, is what makes a lead credible on the floor. Channel it. The lead diagnoses, someone else turns the spanner, and the lead watches and coaches. Within a season the shift has two people who can do what only one could.
Where to read more
Supervisor promotion is one of five people patterns in plastics plants that we describe. A structured manager development programme covers the skills above in more depth. Extrusion plants, where line supervisors usually rise from the winder, have their own notes for extrusion line supervisors. For a longer guide to the first year in the role, see developing first-time supervisors.
