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

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.