Yamaha YP-X Series, Owner'S Manual

Page: 104 / 110

CHAPTER 6 Specifications
6-22
2. Moment of inertia of the chuck
When the chuck form resembles that shown in Fig. 6-24:
Ws = 0.0026
×
1
×
4
×
6
= 0.06 (kg)
Fig. 6-24
3. Moment of inertia of the workpiece
8cm
4cm
R Axis
2cm
ρ π
D
2
h
4
0.0026
π×
2
2
×
4
4
0.03 (kg)
= Ww
=
=
0.03
×
2
2
8
×
980
0.03
×
8
2
980
0.002 (kg · cm · sec
2
)
= Jc
=
+
From equation (6.3):
From Fig. 6-25:
Fig. 6-25
4. Total weight
W = Ws+Wc+Ww=0.19 (kg)
5. Total moment of inertia
W = Js+Jc+Jw=0.0085 (kg·cm·sec
2
)
The allowable R-axis moment inertia is 0.01 (kg·cm·sec
2
), so there is no prob-
lem with the above point.
8cm
1cm
6cm
4cm
R Axis
0.06
×
(1
2
+4
2
)
12
×
980
0.06
×
8
2
980
0.004 (kg · cm · sec
2
)
= Jc
=
+
From equation (6.4):