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Creating Trenches and Non-Circular Hole Pads on PCBs

Shenzhen Inno Circuit Co.,Ltd | Updated: Jun 05, 2018

Creating Trenches and Non-Circular Hole Pads on PCBs


Grooves and non-round hole pads can be created in AD6.3 and later versions, adding trenches and square pad dimples.


The detailed drilling type can be seen from the manufacturing steps. Place a special string symbol on your PCB and add the output specification on it. Place the legend string symbol in the DrillDrawing layer.


Note: If the latest software version supports output file inspection, it is best to check your PCB processing file to see if there is already a groove in your board. In addition, the most common methods used in the earliest versions include the description of grooves in mechanical or solder masks, using textual descriptions. Some designers place pads or vias that overlap strings in the vias to define the area of the drill output, but this may cause the drill bit to be destroyed.


When irregular holes are manufactured differently than the next board structure, you will find that your board structure is more suitable to be processed. So there are three ways to define the groove


Add detailed processing information to the mechanical layer


Add multiple overlapping pads or vias


Apply CAMtasticNCDrill Features


For this design example, the mechanical layer is usually used to describe the groove information


The detailed information can be found in the mechanical CircuitPlateRouteDetails, where you can see that the connection of the wiring is connected to the trenches of the components J1, J6, and J2S. When you switch to single-layer mode, you can see the initial settings for each layer (shortcut to switch to single-layer mode: shift, s)


The wiring details are included in the component so that the components are moved when switching.


Before using this route, check the PCB processor to see if the method of setting up the dog can be accepted.


For this step, the pad and trench area must have been established in the following sufficient support information to the processor:


The multilayer pad with holes is set to 0 units, which is the default pad area


The starting and ending pad positions are located at the end of the groove position, and the size of the holes for these pads is the same as the groove size.


Place a line on the mechanical layer of the plating channel detail from the starting center point to the end of the pad. The width of the line refers to the width of the trench cutout.


You also need to think carefully about the inner plane connection of the trench pads, leaving enough room for the inner plane to place the physical connections, and the hot pads and empty pads need to be set manually. In this PCB example, the hot pad has been used - manually creating the arc and wire. See J1 pad 1 for details.


The connection rules for the power plane connections set for the pads can be directly connected. As for the design rule, check the power plane connection type setting rule settings directly connected to these trenches, (rule: PlaneConnect_Obround_Pads, add an already set class for the pad in the design> class can be more easily set in the rule.) When mounted on a board, you can choose simple options to connect directly to these trench pads if you cannot easily connect to the hot pads.


Finally, the trench pad cannot be connected to the plane. For example, pad 2 and pad 3 on J6 need to be copper-clad on the cut empty area, so adding a line or other object as the flying line of the trim area connects the inner layer . Because the plane is negative output.


When you export your Gerber files or ODB++ files, carefully check the connections of the inner layer, remember to include the Planned routing layers, and remind your board manufacturer to pay attention to the trench pads on the PCB.