Multilayer ultra mICRO Drill
0.050 – 0.090 mm
Multilayer Super mICRO Drill
0.100 – 0.190 mm
0.20 – 1.15 mm
0.20 – 0.65 mm
0.70 – 3.175 mm
Multilayer Undercut Drill
0.15 – 0.65 mm
0.20 – 2.50 mm
0.30 – 3.175 mm
D835 / D534 / D532
3.20 – 7.50 mm
On request:Inch sizes / Special dimensions
Hole Registration Accuracy
Hole registration accuracy is measured by an AOI machine. As shown below, hole positional accuracy is affected by some causes, therefore by countermeasure these defects we can get better accuracy results.
Roughness of Hole Wall
The below pictures shows some very rough holes caused by drilling. This defect should be controlled to get the desired quality requirements.
Poor swarf evacuation results in swarf deposit in the drilled hole and any space between the PWB and entry board.
Resin Smearing / Wicking
Resin is melted by heat of drilling and attaches to inner and copper layer. It prevents connection with the copper.
Drill Bit Breakage
Drill breakage is of two types:
- Deflected breakage.
Radial force tends to break the drill at the end of flute.
- Twisted breakage
Large torque tends to break the drill at the middle of flute
Burrs occur around drilled holes. It occurs on top and bottom boards.
Accurate Slot Drilling
Solution of short slot drilling by pre-drilling.