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).
- 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.
Parameters
Milling
| Parameter | Value |
|---|---|
| Minimum milling tool diameter | 0.8mm |
| Smallest radius for inner corners | 0.4mm |
| Minimum spacing copper / milling contour | 200µm |
Application
| Application | Milling tool diameter Ø | Multi-CB Service |
|---|---|---|
| Standard | ≥ 2.0mm | Inclusive |
| Special | ≥ 0.8mm < 2.0mm | Inclusive |
NPTH slots / milling
| Option | Parameter |
|---|---|
| min. Breite: | 0,8mm |
| Layer: | Dimension-Layer, z.B. EAGLE layer 20 |
| Kupferfreistellung: | 150µm |
| Hinweis: | Die Kupferfreistellung muss erfolgen. |
PTH slots / milling
| Option | Parameter |
|---|---|
| min. width: | 0,6mm |
| min. annular ring | 200µm |
| Layer: | milling (mechanical layer), e.g. EAGLE layer 46 |
| Note: | Needs copper connections on TOP and BOT for through-plating. |
Milled-out portion for exactly rectangular parts
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.
Z-axis milling (level 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.