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

Parameter	Value
Parameter	Minimum milling tool diameter	Value	0.8mm
Parameter	Smallest radius for inner corners	Value	0.4mm
Parameter	Minimum spacing copper / milling contour	Value	200µm

Milling application

Application	Milling tool diameter Ø	Multi-CB Service
Application	Standard	Milling tool diameter Ø	≥ 2.0mm	Multi-CB Service	Inclusive
Application	Special	Milling tool diameter Ø	≥ 0.8mm < 2.0mm	Multi-CB Service	Inclusive

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:	Parameter	0.8mm
Option	Layer:	Parameter	Dimension layer, e.g. EAGLE layer 20
Option	Copper exemption:	Parameter	150µm
Option	Note:	Parameter	Copper exemption needs to be carried out.

PTH slits / milling - Design parameters

Option	Parameter
Option	min. Ø:	Parameter	0.8mm
Option	Layer:	Parameter	milling (mechanical layer), e.g. EAGLE layer 46
Option	Note:	Parameter	Needs copper connections on TOP and BOT for through-plating.