Use lumped parameter models when temperature gradients inside each part stay small, time constants are long, and you need speed for design iteration. Use FEM when geometry drives the answer, local gradients matter, or modal detail decides performance. Reduced order modeling sits between: FEM fidelity at lumped-model speed. Pick the model that matches the question, […]

A flexure stage reaches sub-micrometre accuracy when elastic deformation replaces sliding joints, Abbe offsets are minimized, stiffness ratios exceed 500 to 1, and the metrology loop is short. Success depends on topology choice, spring stiffness math, material control, and tolerancing more than on the actuator. Sub-micrometre accuracy is not an exotic speciality anymore. Semiconductor handling, […]

Choose air bearings when you need friction-free motion and nanometer smoothness over long travel. Choose flexures when travel is short and zero backlash matters most. Choose crossed roller bearings when you need high stiffness and load capacity at moderate cost. The wrong pick corrupts the error budget before the first part ships. How Air Bearings […]

In a precision machine, temperature is a dimension. A positioning stage that is accurate to a few nanometres on the day it is qualified can lose that accuracy by lunchtime because the room warmed up, a motor dissipated a little more power, or an operator opened a door. The mechanics did not change. The temperature […]