Tooling management: keeping cutting and forming tools where the job needs them

Knowing what you own and where it currently is

Control begins with an identified population: each tool or holder marked, recorded with its specification, and traceable to a location, whether that is the crib, a machine, the regrind loop or a setter's box. Plants without this buy replacements for tools they already own, and simultaneously run out of tools that exist somewhere unrecorded. The private stores that setters keep are a symptom rather than the problem: people hoard because the official system has failed them before. Fixing availability generally does more to empty the personal drawers than any instruction to hand tools back.

Deciding tool life policy rather than waiting for the part to go wrong

Running a tool until the product falls out of specification means the plant learns about tool wear from scrap. The alternative is a change point based on parts produced, cutting time or a measured indicator, set from evidence about how that tool behaves in that material. Erring early wastes tool cost; erring late wastes product and machine time and sometimes damages the workpiece or the machine. The right position depends on the relative cost of each, which differs sharply between a cheap insert on a low-value part and an expensive tool on a nearly finished component.

Presetting and the machine time it releases

Assembling and measuring a tool offline while the machine continues running converts machine downtime into work done in parallel. This requires a preset area, the measuring equipment, a duplicate of the holders in circulation and the discipline to prepare for the next job before the current one ends. The duplicate holders are usually the sticking point, since they represent real capital tied up in items that spend much of their life idle. The justification is machine hours released on the constraint, which is where the calculation should be done rather than across the whole shop.

Running the regrind and refurbishment loop as a supply chain

Regrindable tooling moves in a cycle between the machine, inspection, the grinder and back, and it fails when the cycle time is unknown or the loop is unbalanced. Track how many of each type are in circulation and how long the round trip takes, including any external service. When a shortage stops production, the cause is usually that the quantity in circulation was set for an old demand pattern. Set a review point, and record the number of permitted regrinds per tool, since a tool reground past its useful geometry produces quality problems that get blamed on the machine.

Standardising the tool list before it becomes unmanageable

Every new part programme adds tools, and without control the plant ends up with many near-identical items, each carried in small quantity, each needing its own preset data and regrind arrangement. Introduce a review at the point of process design that asks whether an existing tool will do, and maintain a preferred list that programmers work from. Rationalising afterwards is possible but slower, since it means revalidating programmes. The gain is fewer stock lines, better availability of the ones that remain and less setup error from tools that look alike but are not.

Frequently asked questions

Should the tool crib be locked and staffed?

It depends on shift coverage and the value of what is held. A staffed crib gives control and advice but becomes a queue and a constraint out of hours. Open access with recorded self-service works where the population is well identified and people trust the system to restock. The worst arrangement is a locked store nobody can reach on nights, since that guarantees informal stores will appear and the recorded position will drift away from reality.

How do we work out how many of each tool to hold?

Work from the cycle rather than from a general stock rule: how many are in use at once across the machines that need them, how many are travelling through inspection and regrind, and how long that loop takes including any external supplier. Add an allowance for the ones that get damaged. Reviewing that arithmetic when the product mix changes prevents the slow drift into shortage that follows a change in what the plant actually makes.

Who should be responsible for tool condition, the operator or the setter?

The person who fits the tool is responsible for confirming its condition at that point, and the person who removes it is responsible for reporting damage rather than returning it silently to the crib. Both need a quick way to quarantine a suspect tool. Where returned tooling is not inspected, damaged items circulate and eventually cause a scrapped part on a job where the cost is high, at which point the loss is attributed to whoever happened to be running it.