Page 22 - Modular design for machine tools

xx Nomenclature

p : Number of identical entities
e
u: Feed movement
v: Cutting movement or movement in general

Λ : Deviation vector
j
δ : Vector
j
λ : Linear deviation of point O j
ji
ψ : Rotation of structural body component about axis passing through
ji
point O j
2. Nomenclature for Part 2
A: Cross-sectional area, bearing area
A : Apparent contact area
a
A : Real contact area
r
C: Constant to represent joint stiffness, coefficient of contact
compliance
C : Compliance
k
C : Load distribution factor
r
D: Damping ratio
E: Young’s modulus, modulus
E loss : Energy loss per cycle
F: Cutting force
F : Frictional force
r
F drv : Driving force
H: Height of column, representative length or height
I: Cross-sectional moment of inertia (second moment of area)
K (K , K , K , K , K , K , K , K dyn , K , K , K , K , K , K ): Stiffness
t
sep
eq
e
sn
sh
ST
b
s0
SB
R
drv
a
K : Stiffness of joint surroundings
0
K : Joint stiffness
j
L (L , L , L ): Representative dimension of guideway, protruded
z
G
x
length
M: Moment
N: Rotational speed
P (P dyn , P , P , P , P ), ∆P: Load
t
st
r
h
Q: Normal load, normal preload, tightening force
Q : Magnification factor
D
R (R CLA , R , R , R max , R rms ): Surface roughness
T
a
R , R , R : Reaction forces
A
C
B
S: Constant
T: Torque
∆T: Temperature difference at contact surface
V : Period of vibration
T
W : Volumetric weight of water
V
X, Y, Z: Cartesian coordinate