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Making a hole with very tight tolerances is often a two-part process. When starting from scratch, a drill is used first to create the hole.

The limitations of using milling tools to prepare holes for finishing become apparent as hole depth and volume increase. Enter the relatively simple and affordable twin cutter, which can solve this and virtually any other holemaking problem.

Shrink-fit and hydraulic holders are both useful in low clearance, tight work envelopes found in moldmaking and multi-axis machining applications. When deciding which one to use, their differences will guide your choice. Here are some of the fundamental contrasts to help you decide which holder type is best for your work.

Lead angles close to 90° more effectively combat potentially damaging chatter and vibration because they apply the least amount of radial pressure.

Anyone who’s made holes understands the difficulties that can arise: vibration, wander and even breakage. When it comes to production-level volume, these issues become even more limiting. Many turn to helical interpolation with a mill as a reliable way to rough out holes. We’re here to tell you there’s a faster, easier option.

Milling is a core operation in all kinds of manufacturing environments. Here are five different types of milling holders, each with their own strengths and weaknesses. We’re here to help you choose with a breakdown and tips for using each.

Common boring mistakes that are costing you time & money—and how to fix them