| Cause |
Failure condition |
Countermeasure |
M
a
n
u
f
a
c
t
u
r
e |
Unsuitable overall length |
Incorrect overall length causes non-piercing or
over piercing |
Check overall length. |
D
r
i
l
l
i
n
g
C
o
n
d
i
t
i
o
n |
Z feed set incorrectly |
Non-piercing or over piercing are caused by the
setting error compared to the target drilling depth. |
Check input values. |
P
W
B
S
e
t
t
i
n
g |
Uneven thickness of PWB and backup board |
Non piercing or over piercing are caused by different
depth values compared to the setting parameter. |
Check PWB and backup board thickness. |
E
q
u
i
p
m
e
n
t |
Unsuitable spindle height |
Non piercing or over piercing are caused due to
the variable height of the drill point. |
Check spindle height. |
| Unsuitable ring depth |
Check ring setting depth. |
