Gear and Rack

A coupling that fails tells you why, if you look at how it failed. A cracked hub and a side-worn spider need opposite responses.

Direction-dependent error is often blamed on the coupling. Before changing it, separate real lost motion from torsional wind-up - the fixes differ.

Most coupling failures trace back to the order things were done at fitting time. Align first, tighten second, set the hub gap third.

Three numbers settle almost every coupling sizing question: the torque you size on, the bore you can really use, and the speed the coupling will see.

Angular, parallel and axial misalignment do not behave the same way. One is easy to measure, one is easy to see, one appears only after warm-up.

Rigid or flexible is not a safety-versus-performance choice. It is about how much misalignment and thermal growth the axis actually produces.

Jaw and diaphragm couplings both connect a motor to a ball screw. The difference that matters is whether there is a wear part inside the drive train.

A shaft coupling is chosen last and fails first. Torque, bore, misalignment and backlash - the four things that decide whether it suits a CNC axis.

How module, tooth form and backlash decide whether a plasma table cuts clean edges at speed, and why the dust shortens every interval.

How to mount and align gear rack on a 2 m gantry router, covering joint alignment, backlash setting and lubrication intervals.

A gearbox manufacturer walks through the reduction ratio formula, a worked 100:1 example, and why efficiency decides the output torque you really get.

Rack gears convert rotary motion into linear motion - the core of long-stroke CNC axes. This guide covers rack gear types, ball screw comparison, selection tips and factory-direct