Introduction for pcb depth routing 

When using depth routing, the routing goes partially through the board thickness. Normally all routing done on a PCB is going through the whole board thickness. However difficult, it is possible to rout away a small area on the surface or some parts of inner layers. This can only be done before they are pressed. The tolerances in depth routing are not by far what they are when treating metal, but some result can be achieved.

Depth control routing(milling) is also known as Z-axis milling or level milling, it refers to partial routing in printed circuit board manufacturing with a variable level elevation at the PCB edge or within PCB.
Control depth routing technology supports a high end market with the need for accuracy, miniaturization, process stability and the need for productivity, and depth routing option allows for very complex designs, bended boards and structures to be processed with fine precision.

Depth control routing technology have great advantages in PCB assembly as the special shape of depth routing.

Advantage
1.It can avoid cold soldering as siphonic effect use NPTH step stair slot
2.Use Special size NPTH step stair as resonant cavity of microwave signal, degrade signal loss and other special function.
3.Use the step stair of PCB edge make card slot is favor for PCB fixed and installation
4.Use the step stair in middle of PCB apply in special module application, and degrade the height of PCB assembly, achieve refinement and miniaturization

Hopetimepcb has manufacturing capability to build various types of depth routing with different size and depth, no matter on the PCB edge or within the PCB, and the precision tolerance can be controlled as +/-0.1mm(4mil).

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