Milling

Printed circuit board breakouts and contours are normally milled. Please observe the following rules:

  • Milling always comes at no extra-charge at Multi-CB.
  • The inner and outer contours of the circuit board should be indicated with a line width of 1µm! This prevents problems in dimensioning and measurement.
  • Please avoid milling copper (durability of the circuit board, risk of injury).

Milling parameters

ParameterValue
ParameterMinimum milling tool diameterValue0.8mm
ParameterSmallest radius for inner cornersValue0.4mm
ParameterMinimum spacing copper / milling contourValue200µm

Milling application

ApplicationMilling tool diameter ØMulti-CB Service
ApplicationStandardMilling tool diameter Ø≥ 2.0mmMulti-CB ServiceInclusive
ApplicationSpecialMilling tool diameter Ø≥ 0.8mm < 2.0mmMulti-CB ServiceInclusive

Sample milling diagram

Sample milling diagram

Outer corners of contours may be 90°, or rounded to your specifications.

The inner corners of contours have at least the radius of the milling tool.

Milled-out portion for exactly rectangular parts

Printed Circuit Board milled-out portion

To hold exactly rectangular parts, the corresponding milled-out portion should also be drilled at the corners; this permits (for example) a precise framing for seven-segment display units.

NPTH slits / milling - Design parameters

Option Parameter
Option min. Ø:Parameter0.8mm
Option Layer:ParameterDimension layer, e.g. EAGLE layer 20
Option Copper exemption:Parameter150µm
Option Note:ParameterCopper exemption needs to be carried out.

PTH slits / milling - Design parameters

Option Parameter
Option min. Ø:Parameter0.8mm
Option Layer:Parametermilling (mechanical layer), e.g. EAGLE layer 46
Option Note:ParameterNeeds copper connections on TOP and BOT for through-plating.

Z-axis milling (level milling)

Z-axis milling

A variable level elevation can be milled at the edge or within a circuit board. This is called Z-axis milling.

To do this, create a new layer in your PCB design software for Z-axis milling only. Set the contour (1mil) for the milling area and also write down the desired milling depth (tolerance ±0.20mm).

Now activate the option "Z-axis milling" in the PCB calculator.

Milling/scoring combination hassle-free

If the outer edge of the milling lies on the scoring line, the milling tool moves along the scored base material. This increases the risk of forming of chips.

Advice: Do not mill directly aligned with scribe lines.

We manufacture PCBs with milling and scoring on the same line. Should this result in  shaving (chip) formation, a reclamation in this regard would be rejected.

Printed circuit board milling and scoring - avoid problems 1

Milling meets scoring line at the panel frame (grid)

Printed circuit board milling and scoring - avoid problems 2

Milling and scoring on one line leads to chip formation