Page 53 - CATALOGUE

5. Calculation of rigidity

Rigidity of the Feed Screw System

Elastic deformation of the feed screw system can be obtained by formula (5).

……………………………………(5)

δ: Volume of axial elastic deformation of the feed screw system (μ m)
Fa: Axial load (N)

Axial rigidity of the feed screw system can be obtained by formula (6)

…………………………(6)

K: Axial rigidity of the feed screw system (N/μm)
K s: Axial rigidity of the screw shaft (N/μm)
K N: Axial rigidity of the nut (N/μm)
K B: Axial rigidity of the support bearing (N/μm)
K H: Axial rigidity of the nut and bearing mounting section (N/μm)

1) Axial rigidity of the screw shaft

a. Ball screw shaft is fixed at one end

Fixed Floating

2
A: area of screw cross sction (mm )

d 1: root diameter (mm)
2
E: vertical elastic coefficient (2.06×105N/mm )
L: mounting distance (mm)

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