How do we protect knowledge held by a few melters or moulders?

On a Monday the senior melter rings in with fever. By Wednesday the spectro slips show carbon wandering, the second ladle reaches the moulds cold, and the moulding bay is chasing pinholes. No furnace hand was careless. The man who usually caught these drifts before they reached a mould was lying at home.

So the short answer runs like this. Name who holds what. Pair each holder with a learner. Write the key settings in plain words. Pay something for teaching. Sign a learner off only when they can run the task alone. It takes months, not weeks. Below, each part is laid out for a working melting bay and moulding floor, and then come the worries owners raise once they start.

A melter reads slag, judges fluidity from the way metal runs off a sample spoon, and knows how much carbon raiser or ferro-silicon a spectro result calls for. He hears a lining that is thinning. A hand moulder judges ramming hardness by feel, knows where a deep pocket needs a vent wire, and can patch a broken mould edge so the casting shows no mark. Some of this can be written. Some can only be shown.

• Settings and sequences. Charge order, tapping range, ladle preheat time, moisture in the muller sand. Put these on paper first.
• Judgement calls. Sluggish metal, a soft mould face, a core that sits proud. These need side-by-side work plus a few written warning signs.
• Rescues. What the holder does when a ladle goes cold, a core cracks or metal runs out at the parting line. These are worth most and are recorded least.

Before any training plan, draw up one sheet. Down the left go the jobs without which pouring stops. Charging and tapping, spectro corrections, magnesium treatment for ductile heats, hand moulding of the largest boxes, core setting for pump casings, judging sand at the muller. Across the top, list the people. In each cell mark alone, with help, or never tried. Most owners find two or three rows carrying a single name. Those rows are the plan.

1. 1

   Let the holder help choose the learner

   Ask the senior melter or moulder whom they would trust. A learner picked over their head is often kept away from the hard jobs, politely and for months.

2. 2

   Roster the pairing on real heats and moulds

   The learner works at the holder's elbow on named tasks during named shifts. Written into the roster, the pairing survives a rush order.

3. 3

   Write after doing, not before

   Each Friday a supervisor sits with the pair over tea and notes what was done and why, in the holder's words. A ruled notebook will do.

4. 4

   Hand over one row at a time

   The learner takes charging, or core setting, while the holder watches. Move to the next row only when that one is steady.

5. 5

   Sign off solo work with two names

   When the learner has done the task alone several times without the holder stepping in, record the date, the task and both names. The roster then uses that entry.

Task: for example, tapping a heat from the induction furnace.
Holder: name, plus the learner and the date of sign-off.
Before you start: the checks the holder always makes, in his order.
Normal signs: what good metal or a good mould looks, sounds or feels like.
Warning signs: what tells the holder something is drifting.
First response: what the holder does at each warning sign.
Never do: the two or three habits that cause scrap or burns.
Last checked: date, and who walked the card against the floor.

Keep each card to one side of a sheet, written in Hindi, Tamil, Marathi or whatever the bay talks in. A photo of a good chill wedge fracture beside a bad one teaches more than a paragraph. Pin the card where the task happens, not in a file in the office.

Holders seldom refuse to teach out of spite. Their standing rests on being irreplaceable at the furnace, and nobody has said what teaching earns them. A modest monthly teaching allowance while a learner is paired changes that sum. So does a recognised senior grade for anyone who has brought a learner to sign-off. The learner needs a pay step at sign-off as well, or the new skill walks to the foundry across the road. Grade and pay logic for these roles is covered under compensation and rewards.

What if the senior will not teach? Ask why, in private. Fear for the job and a disliked learner are the usual reasons. Offer a choice of learner, put the allowance in writing, and tell him clearly that nobody is cutting his post. If refusal still holds, it becomes a quiet performance conversation.

What if the learner leaves once trained? Some will. Close the gap between sign-off and the pay step, and pair two learners on the riskiest row, so one exit does not reset the plan.

How many months will this need? Charging or core setting can pass across inside a season of rostered shifts. Melt corrections and hand moulding of large work often need a year or more.

Should we just hire a trained melter? Hiring helps, yet a newcomer still has to learn your furnace, your scrap mix and your buyers' grades. Pair him with the holder too. Our guide to finding and testing skilled foundry hands covers trade tests.

Fill in the sheet this week and circle the single-name rows. Pick the row that would hurt most and pair it before the month ends. Our overview of foundry people problems covers heat, fettling churn and furnace shifts alongside this one, and why skill pools in so few hands explains why it keeps coming back. Should you want help with the pairing plan and the grades, tell us about the foundry.