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

OptionMinimum milling tool diameterParameter0.8mm
OptionSmallest radius for inner cornersParameter0.4mm
OptionMinimum spacing copper / milling contourParameter200µm

Milling application

ApplicationMilling tool diameter ØMulti-CB Service
ApplicationStandardMilling tool diameter Ø≥ 0.2mmMulti-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.