Page 265 - Modular design for machine tools

224 Engineering Design for Machine Tool Joints

TABLE 6-7 Recommended Values of C 0 for Horizontal Slideways (by
Levina)

Mean interface Width of slideway C ,
0
2
pressure p kgf/cm 2 mm mm . cm /kgf
m,
< 50 0.5–0.7
< 100 1.0
< 3.0 < 200 2.0–2.5

< 300 3.2
< 400 4.0

> 3.0–4.0 (40–50)% lower than above values

Notes: 1. In the case of slideway with local deformation, the recommended values
2
of C are (50–70)% higher than those of slidways under p < 3.0 kgf/cm .
m
0
2. In the case of vertical slideway, the values of C should be (30–40)% higher
0
than those for horizontal slideways.

∆ = 18 mm
P

Experimental
4 2
value
500

Joint deflection λ, mm 2 Theoretical 1 P
3

value

p = 0.26 kgf/cm 2
1 0
Experimental
value
0
0 250 500 750 1000 P, kg
0 1 2 3 4 p, kgf/cm 2
Interface pressure (mean)
m
Note: Theoretical value was calculated on the basis of the expression of λ = Cp .
Figure 6-3 Applicability of Ostrovskii’s expression to engineering calculation (by Levina).