Tool measurement is a crucial step in CNC machining, directly impacting precision, productivity and cost control. Two main approaches exist: offline tool presetting and on-machine tool measurement. Each has its advantages and limitations, but which is the best fit for your workshop?
This article compares these two methods, helping UK manufacturers understand the benefits of each and decide the optimal tool measurement strategy. We’ll also explore how ZOLLER UK’s solutions support both approaches with industry-leading technology.
What is On-Machine Tool Measurement?
On-machine measurement involves setting and measuring tools directly in the CNC machine’s spindle or turret. Operators typically use probe systems or touch sensors to record tool length, diameter and wear without removing the tool.
Advantages of On-Machine Measurement
Immediate tool data capture: Measurement happens during set up or machining without moving tools.
Reduced handling: Tools stay in the machine, decreasing risk of damage.
Space-saving: No separate measurement station required.
Limitations of On-Machine Measurement
Machine downtime: Measuring tools on the machine ties up valuable machining time.
Limited accuracy: Machine probes may not match the precision of dedicated tool presetters.
Operator dependence: Requires trained operators to measure tools correctly on complex set ups.
What is Offline Tool Presetting?
Offline tool presetting uses dedicated machines to measure tools outside the CNC machine, capturing accurate geometry such as length, diameter and runout. Tool data is then digitally transferred to the CNC controller.
Advantages of Offline Tool Presetting
Minimises machine downtime: Tool measurement occurs in parallel with machining operations, improving throughput.
High precision: Dedicated presetting machines, like those from ZOLLER, achieve micron-level accuracy.
Standardised set ups: Stored tool data enables repeatable, error-free tool changes.
Faster changeovers: Operators can prepare tools in advance for quick job transitions.
Limitations of Offline Tool Presetting
Additional equipment cost: Requires investment in presetting machines.
Space needed: Requires dedicated area in the workshop.
Training: Operators need instruction to use presetting systems effectively.
Which Is Best for Your Workshop?
Choosing between offline presetting and on-machine measurement depends on your production needs, budget and workshop layout. Here’s a side-by-side comparison:
Offline Tool Presetting
Machine Utilisation: Higher — machines remain productive while tools are preset offline
Measurement Accuracy: Micron-level precision with dedicated equipment
Initial Investment: Higher — requires investment in presetting machines
Workflow Flexibility: Allows parallel tool preparation, speeding up changeovers
Training Complexity: Moderate, with user-friendly interfaces such as ZOLLER’s software
Space Requirements: Needs a dedicated area for the presetting machine
On-Machine Tool Measurement
Machine Utilisation: Lower — machine is tied up during measurement
Measurement Accuracy: Good, but generally less precise than offline presetting
Initial Investment: Lower — often uses existing machine probes
Workflow Flexibility: Limited — dependent on machine availability
Training Complexity: Higher — requires skilled machine operators
Space Requirements: No additional space required
How ZOLLER UK Supports Both Methods
ZOLLER UK offers industry-leading tool presetters that provide offline measurement with exceptional accuracy, as well as software to seamlessly integrate tool data into CNC systems.
For workshops opting for on-machine measurement, ZOLLER provides expert advice on optimising probe systems and operator training to maximise effectiveness.
Conclusion
Both offline tool presetting and on-machine tool measurement have their place in modern manufacturing. For workshops focused on maximising machine uptime, improving accuracy and speeding changeovers, offline presetting with ZOLLER’s advanced systems is often the superior choice.
Whichever method you choose, the key is accurate, reliable tool data to ensure quality and efficiency. Speak to ZOLLER UK today to discuss which solution fits your workshop’s needs best.