| Cause |
Failure condition |
Countermeasure |
D
r
i
l
l
i
n
g
C
o
n
d
i
t
i
o
n |
High chipload |
Increase of thrust force causes burring. |
Apply suitable chipload. (Please refer to drilling
parameters.) |
| Low chipload |
Low chipload promotes wearing, and it causes burrs. |
Apply suitable chipload. (Please refer to drilling
parameters.) |
| Hit count to high |
To many hits promotes wearing, and causes burrs. |
Apply suitable Hit Count |
| Raised entry board |
Burrs occur on the front of the PWB. |
Check entry board setting. Use thicker entry board. |
P
W
B
S
e
t
t
i
n
g |
Unsuitable entry board |
Thinner PWB's are less rigid and
more likely to "ride-up" the
drill, causing burrs. This also applies to soft / flexible materials |
Using suitable thickness entry board. |
E
q
u
i
p
m
e
n
t |
Unsuitable bush and pressure foot setting |
A deformed bush can't press entry board properly.
A worn pressure foot bush makes uneven contact. |
Change bush. Checking pressure foot. |
| Low pressure foot pressure |
PWB lifts more easily causing burrs. |
Set correct pressure foot force. (Recommend: About
100-150 N, Suitable value is depends on application) |
| Non deburring |
Untouched burrs. |
Deburr treatment |
