When the cutting accuracy of a bandsaw drops, the impact is immediate: uneven cuts, higher scrap rates and longer cycle times. In this article, UK bandsaw supplier Dimakin explains why cutting accuracy declines, and how to correct it quickly.
Accuracy rarely disappears overnight. In most cases, clear warning signs emerge first, allowing workshops to correct problems quickly and avoid unnecessary downtime. Common symptoms include angled or tapered cuts, rough or inconsistent surfaces, blade wandering, excessive burr formation, and inconsistent cut lengths. Operators may also notice increased vibration, chatter or unusual blade noise. These indicators typically point to issues with blade condition, set up, alignment or feed control.
Blade condition is one of the most frequent contributors to poor accuracy. Worn blades struggle to maintain a straight cutting path, particularly in thicker sections or higher-strength materials. Incorrect blade selection has a similar effect: fine-tooth blades can clog in thick material, while coarse pitches lack stability on thin sections. Both increase cutting resistance, leading to blade deflection. Prompt blade replacement and correct tooth pitch, geometry and width selection are among the fastest ways to restore accuracy.
Blade tension is equally critical. Under-tensioned blades flex during cutting, while excessive tension accelerates fatigue and places unnecessary strain on machine components. Following manufacturer-recommended tension settings and checking them regularly helps maintain stable blade tracking.
Guide and bearing alignment also play a vital role. Worn, misaligned or contaminated guides allow the blade to drift under load. Keeping guides clean, correctly aligned and positioned close to the workpiece minimises unsupported blade length and improves precision.
Finally, consistent feed control and secure workpiece clamping are essential. Controlled bow descent prevents blade deflection, while firm, square clamping eliminates vibration and movement.
More information www.dimakin.co.uk
