The selection steps and installation fixing method of ball screw are detailed as follows：

The selection steps of ball screw

1. Positioning accuracy requirement：

• The first thing to consider is the requirement of bearing positioning accuracy。Whether its processing equipment or industrial robots，It is necessary to ensure that the bearing can meet the accuracy requirements of the mechanical system。

2. Definite lead：

• The lead of the lead screw bearing is determined according to the motor speed and linear speed。Under normal circumstances，The lead of the lead screw multiplied by the motor speed is greater than or equal to the required linear speed。

3. Determine itinerary and related data：

• Determine the travel of the lead screw bearing、Relevant axial end data, etc。The length of the bearing should meet the actual working stroke、Nut length、Safety margin、Installation length、Sum of connection length and margin。

4. Calculate load and speed：

• Calculate the average axial force of the bearing、Rotational speed、Pressure data，To understand the rated load of ball screw bearings、Rated speed、Rated acceleration。

5. Consider environmental and physical factors：

• Know the outside diameter and nut of the lead screw bearing in advance，And consider the ambient temperature、Whether the total length of the nut can meet the actual use needs of different working conditions。

6. Estimated life and durability：

• Consider the service life and durability of bearings，Avoid choosing a cheap product that wont last long enough，This will affect the use of machinery and equipment。

7. Inquiry and purchase：

• After confirming the above information，You can ask the ball screw bearing manufacturer for prices、Payment terms and delivery time，And consider installation capabilities，Make sure the bearings are properly installed and working。

Mounting and fixing method of ball screw

The ball screw is generally installed and fixed by a support seat，There are four common installation methods：

1. One end fixation，One end free：

• Fixed-end bearings bear both axial and radial forces，This approach is simple in structure，Easy to install，But the accuracy has great influence，Suitable for short screw and vertical screw。

2. One end fixation，Other end bracing：

• Fixed-end bearings bear both axial and radial forces，The support end bearings bear only radial forces，And can do a small amount of axial float。This way can avoid or reduce the bending of the screw due to its own weight，At the same time, the hot deformation of the lead screw can be freely extended to one end，Simple structure，Good effect，Widely used。

3. Fixed at both ends：

• Both ends of the lead screw are fixed，Fixed end bearings can withstand both axial and radial forces。In this way, the appropriate pre-tension can be applied to the screw，Improve the support stiffness of the screw，Partial compensation for the thermal deformation of the screw。But its adjustment work is more tedious，And too large or too small preloading force may affect the accuracy。

4. Screw fixation，Nut rotation：

• Nut turning on one side，One side moves axially along a fixed screw。Because the screw doesnt move，The limit speed and pressure stability of the screw can be avoided，Achieve high speed operation。This approach requires high structural requirements，Cost is also high，But good for big trips、Application scenario of high rotational speed。

When selecting an installation method，Comprehensive consideration should be made according to actual working conditions and needs，To ensure that the ball screw can be stable、Work reliably。