Metalcutting CNC machines cater to diverse applications, reflecting the varied needs of users. However, amidst this diversity lies a challenge: many CNC features remain undiscovered or underutilized, potentially hindering operational efficiency. Here, we shed light on some lesser-known CNC capabilities and offer practical dos and don’ts.
Understanding Least Input Increment and Sizing Adjustments: In the past, CNC machines operated with a minimum input increment aligned with their resolution. Today, while resolution has dramatically improved, the standard increment remains the same. Despite this limitation, modern CNCs allow programming values smaller than the least input increment, enabling precise adjustments, especially crucial for tight tolerances.
Rapid Motion Control: Traditionally, simultaneous motion commands (G00) in multiple axes could lead to non-linear motion, risking collisions. However, newer CNCs offer parameter settings to ensure linear rapid motion, enhancing safety and accuracy. For instance, FANUC 30 series controls enable users to choose between linear and non-linear rapid motion, minimizing the risk of tool collisions.
Machine Lock Caution: Features like “Machine Lock” were designed to prevent axis movement, aiding program verification. However, improper usage can result in coordinate system errors, leading to mishaps or crashes. Users must fully comprehend these functions before implementation to avoid disruptions in CNC operation.
Maximizing Feedrate Efficiency: While CNCs boast impressive rapid rates, their cutting mode feedrates may not always suffice, particularly when dealing with coarse threads. In such cases, where standard feedrates fall short, users must exercise caution to ensure accurate machining. Failure to address this discrepancy can lead to inaccuracies in threaded components, posing significant challenges in diagnosis and rectification.
By familiarizing themselves with these hidden features and adhering to best practices, CNC users can unlock new levels of precision and efficiency in their machining operations.
