
4. NOTES ON INSTALLATION
B–65152E/03
BCATLTLON EOT TFC α
26
CAUTION
(2) Correction with a pulley mounted
(a) When the pulley is longer than the key
When the pulley is longer than the key, M
1
and M
2
in the keyway and M
3
in the full key
imbalance section may cause an imbalance. To satisfy the following equations, drill
holes D
1
and D
2
in advance:
π(D
1
/2)
2
H
1
ρR
1
=M
1
r
1
–(M
3
/2)r
3
π(D
2
/2)
2
H
2
ρR
2
=M
2
r
2
–(M
3
/2)r
3
D
1
and D
2
: Diameter of each correction hole (cm)
H
1
and H
2
: Depth of each correction hole (cm)
ρ : Specific gravity of the pulley (kgf/cm
3
)
R
1
and R
2
: Distance from the center line to each correction hole (cm)
M
1
and M
2
: Weight based on the pulley material (kgf)
M
3
: Weight of the imbalance section of the full key (kgf)
(Perform calculation with the specific gravity assumed to be 7.8 x 10
–3
kgf/cm
3
.)
r
1
, r
2
, and r
3
:Distance from the center line to M
1
, M
2
, or M
3
(cm)
Pulley, gear, or coupling
Full key
Output shaft
Section E–E
Section F–F
Magnified view
of section G
T/2 (Thickness of the half key)
T (Thickness of the full key)
NOTE
1 The same correction method is used for the gear, coupling, and so on as well as the pulley.
2 This correction is not required for a motor having no key.
3 When a motor is to be used at a speed higher than 4500 min
–1
, the use of a motor having
no key is recommended.
4 This correction does not result in the fully balanced status.
If correction is still required, perform correction (c).