Editing How to choose servo motors and drives

Choosing suitable servo components for a linear motion machine is straightforward process. This article gives a method for choosing suitable servo motors and drives for a machine with linear axis, such as CNC, 3D printing or pick'n'place systems.
[[File:Linear axis and drives.png|thumb|A typical lead screw driven linear axis comprising linear guides, lead screw and a motor. To drive this, a motor driver and power supply is needed.]]
==Defining goals==
The first step is to define goals of the system. Find numbers to the following questions:
#How much is the required linear force?
#How much is the maximum desired speed?
#What is the required accuracy (resolution, precision, repeatability)?
#What is the required stiffness / nature of mechanical load (stationary/vibrating)?
==Choosing electromechanical parts==
===Choosing linear guides===
Selection of linear guides have different choices to match desired speed range, stiffness, precision and cost. The following table summarizes most common choices with pros and cons:
{| class="wikitable"
|-
! Type !! Cost !! Precision !! Stiffness !! Speed capability
|-
| Round linear bearing (sliding) || Low || Low || Low/moderate || Medium/high
|-
| Round linear bearing (ball) || Low/medium  || Medium|| Medium (Supported only at end points) || Medium
|-
| Track linear guide || Medium/high || High || High (Supported from whole length) || Medium
|-
| Dovetail || Low || Medium/high|| High || Low
|-
| Roller || Low/Medium || Medium || Medium || High
|}
===Choosing lead screw===
===Choosing motor===
===Choosing motor drive===