How to build a pattern and die history register

Start with identity. A stamped number, nothing vaguer. Each pattern, core box or die gets a number stamped on the tool itself, and the record ties that number to the customer part, drawing revision and process.

Add the facts about construction: wood, resin or metal for a pattern, the die steel, cavity count, insert details, the toolmaker and the date the tool was accepted. These explain wear later. A four-cavity aluminium die with hardened inserts ages differently from a single-cavity gravity die in H13 steel, and the record should show which one you hold.

Then add ownership. A tool paid for by the customer is held in trust and may have to be shown on request, while a tool you paid for is your own asset. The register must say which is which.

A die’s life is counted in shots. A pattern’s is counted in moulds. Write the count on the production slip for each run, never from memory a month later when the operator who ran the job has moved to another shift.

Pressure die casting machines carry a shot counter, so read it at the start and at the end of the run and write both figures on the slip. For sand work, count moulds off the moulding line or from the flask tally kept by the box handler, and note any boxes scrapped before pouring.

Add the date, machine, operator and good quantity, which takes a minute and saves an argument when a customer asks how many parts a tool has made. Without it you guess. The guess becomes a dispute.

Each repair is a data point, so record the date out, the date back, who repaired the tool and what was done to it. Note the shot count at the time. It anchors everything else.

Use a list of causes: heat checking, die soldering, a cracked insert, a worn ejector pin, a blocked vent, a loose core print and a warped pattern board. Over a year the list shows which failures repeat, and repeats usually trace to die spray, die temperature or pouring speed rather than to the die itself.

Note the hours the tool was down. A die that sits in the toolroom for a week costs production even when the repair itself is cheap, because the press waits and the dispatch date slips. The register makes that cost visible.

Tools wander. Dies especially. A die may sit on a machine, on the rack, at the toolmaker for welding or at the customer for trials, so log each move with date and name.

Give racks and bays a location code so the record can say bay C, shelf 4, and nobody searches the pattern shop for a morning. Customer-owned tools often need a periodic check and report, and a register with owner and location produces that list in minutes instead of a day on the racks.

Auditors stop being a surprise. That alone pays for the effort.

Set service triggers by count. Polish and clean vents after a set number of shots, check ejector pins at the next step and inspect the pattern board before it warps further.

Watch the trend. When the interval between repairs shortens, ask for a quote on a new die before the old one fails halfway through an order and leaves the customer waiting. A late die stops dispatch. A new pattern set or die can take weeks to design, cut, heat treat and prove, so the warning must come well before the old one gives out.

Start with your five busiest tools. Read the count at the next run, write the repair history you remember and fill in one line for each tool, marking any figure you had to estimate. Add the rest later. Within a month the register covers every tool that runs, and the oldest dies show you where the next repair is coming from.