Meaning
A mechanical or digital device mounted directly on an injection mould tracks the number of moulding cycles the tool has completed. This shot counter provides an accurate, tamper-proof record of the tool’s usage, which is independent of the moulding machine’s internal computer logs. It is necessary for determining when the mould requires routine maintenance, cleaning, or replacement of worn components such as ejector pins and slides.
Tooling Maintenance
Preventative maintenance programs rely on accurate cycle counts to prevent part defects and tool damage. For example, a mould running abrasive glass-filled nylon requires more frequent cleaning and polishing than one running unfilled polypropylene. When the shot counter reaches a specified limit, the tool is pulled from the press and sent to the toolroom for service.
This scheduled maintenance prevents flash, burns, and other defects caused by worn tool surfaces.
Production Tracking
Tracking tool usage also ensures compliance with supply agreements and warranties. Many high-volume moulds are guaranteed for a specific number of shots, such as one million cycles.
Data Integrity
Mechanical counters provide a highly reliable method of data collection because they cannot be reset easily or affected by power outages. They are typically embedded in the mould base to protect them from grease, heat, and impacts. Using a shot counter allows both the OEM and the custom moulder to share a reliable record of tool life.
