Introduction of Ball Screw

Ball Screw is a feed screw that turns the radial motion into linear motion by making a rolling motion between the screw’s ball channel and the nut’s ball recirculaiton channel.The reason for using it instead of trapezoidal shaft is high efficiency. Due to the ball between the nut and the shaft, the friction effect is less compared to the trapezoidal shaft.

Types Of Ball Screw Shaft

Screw shafts are divided into two according to the way they are manufactured.

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Introduction of Planetary Reducer

Planetary reducers are used for applications where low reduction rate and precision are required.Except for the general reducer definition, let’s get to know planetary reducer in a little detail.

Planetary Reducer Input Side and Output Side

planet reducer input output

When viewed from the outside, the input side for the servo motor connection and the output side for the load connection are visible.

The input side of the reducer is designed according to the shaft output and flange dimensions of the servo motor to be connected.

In general, there are body sizes such as 40, 50, 60, 70, 80, 90, 100, 110, 120, 140 and 155. However, for now, we will proceed based on the body of 90 (in the image).

Internal Structure of Planetary Reducer

planet reducer internal structure input output

Planetary reducer consists of 3 basic parts as sun, planets and ring. The servo motor drives the sun, the planets around the sun spin in the ring. In this case, the sun gear transfers the power from 3 different points (for the 3-element reducer) to the outer planetary gears.The output power increases according to the ratio between the outer ring and the sun. At the same time, the speed decreases at the same gear ratio.

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Horizontal Linear Motion With Belt&Pulley – 1

Guide, Belt Pulley , Reducer and Servo Motor Sizing

Belt pulley driven is not my favorite method for linear motion. Because this is the drive method with the weakest positioning accuracy. However, if a cheap and high speed method is required, belt pulley is the most suitable method.

I’m using Yaskawa SigmaJunmaSize+ and THK Life Calculator applications for my all calculations.

linear system calculation inputs

Target values;

Max Speed: 1000mm/sec

Stroke : 2000mm

Let’s start by calculating linear guides as usual. This time we have an asymmetric gravity point. There is also a high speed request, which is specified as 1000 mm / second. Therefore, we will use the SHS series, which is more suitable for high speed. You can use these products either externally or assembled in a linear module.

belt pulley driven linear module

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Horizontal Linear Motion With Rack&Pinion – 1

Guide, Rack&Pinion , Reducer and Servo Motor Sizing

Next is the calculation of the system that will be driven by rack and pinion. Usually this drive system is used in marble, wood, laser cutting and plasma machines.

Also I’m still using Yaskawa SigmaJunmaSize + and THK Life Calculator applications.

Target values;

Max Speed: 500mm/sec

Stroke : 2000mm

linear system steps chart We’ll start with linear guide sizing again.

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