TAIG Tools

  Machined parts are not always produced at one exact dimension. Small variations naturally occur during machining, so drawings specify an acceptable range for each feature. This range is known as a machining tolerance. Knowing how tolerances work helps machinists understand part requirements, choose suitable machining processes, and avoid making a tolerance tighter than the application actually needs. What Is a Machining Tolerance? A machining tolerance is the permitted variation from a specified dimension. Instead of requiring a part to measure one exact size, the drawing gives an acceptable upper and lower limit. For example, a dimension of 1.00 ± 0.05 in allows the finished feature to measure anywhere from 0.95 to 1.05 in. The smaller the allowed variation, the more carefully the machining process needs to be controlled. Common Types of Machining Tolerances Machining tolerances can be specified in several ways. The most common types include bilateral, unilateral, limit, and geo...

Accurate milling depends on more than choosing the right machine and cutting tool. During machining, cutting forces can cause a tool to bend or move slightly away from its intended path. This movement, known as tool deflection, can affect dimensions, surface finish, tool life, and overall machining results. Understanding the causes can help machinists make better setup and cutting decisions. What Is Tool Deflection? Tool deflection occurs when cutting forces push a tool away from its programmed or intended position. The effect becomes more noticeable when using small diameter cutters, longer tool extensions, heavy cuts, or less rigid setups. Tool deflection should also be distinguished from runout. Runout involves unwanted variation during rotation, while deflection occurs because cutting forces cause the tool to bend or shift under load. Both can create machining problems, but they require different approaches when troubleshooting. Common Causes of Tool Deflection Several factors can ...