Altium Designer is a professional PCB design tool.

• The size of the slots can be indicated in text together with tolerances ( if needed). Indicate only one border in your mechanical layer. If you want a round shaped PCB then we expect a round shaped contour, not a round shaped PCB inside a square box, as this will result in a square shaped PCB Examples. Acceptable contour file indicating slots.
• Use drilled slot command (G85) - check this option to use multiple drilled holes to create slots. Generate Board Edge Rout Paths - check this option to create a separate NC Rout file to define the board shape, including board cutouts. Rout Tool Dia - specify the tool size used to rout the board outline.
• Altium Designer 20 represents decades of innovation and development dedicated to creating a truly unified design environment - one that enables users to effortlessly connect with every facet of the PCB design process.

Design Rule Setup

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Downloadable Files

Drill slots are officially supported. Most design tools can generate a drill slot by use of a built-in command on the footprint or board layout editor. These slots are represented on your Drill file, rather than an outline. Note that limitations apply to the use of drill slots.

Kind customers have provided loadable DRC rule and Stackup files for our 2 and 4 layer services.

Note, these files are not exhaustively validated or guaranteed by OSHPark, and may contain errors. Use your judgment and always verify your designs meet our service specs to prevent design defects that could affect your boards. If you have corrections or find errors, please email support.

known issues: Current minimum 2 layer specs are 10 mil drill hits, with 5 mil annular rings. The RUL file currently shows the older 13mil drill and 6mil ring

Generating Manufacturing Files

For accessing the various menus and output screens, see Altium’s Gerber Setup

Disabling “ Mechanical Layers to Add to All Gerber Plots”

Altium tools have the option Mechanical Layers to Add to All Gerber Plots, which must have all layers unchecked. Many footprints contain mechanical “courtyard” or “pick and place” data on these layers. When these footprints are added to copper layers, it can create gerbers that will be fabricated with shorts. See Altium’s Gerber Setup for information on how to access this setting.

Internal Plane Polarity

We recommend submitting planes with a Positive polarity. See our Positive vs Negative Gerbers page for additional information.

Board Outline

We need a watertight board outline on its own layer with no extra text or measurements. This tells us where the fab should mill the edges of the board. This layer can also contain board cutouts.

For best results, place the outline by itself on the Keep Out, or on a Mechanical Layer (normally 1 or 2). This will generate the outline on .GKO or a .GM<number> file.

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Drills

Drill files should work without issues for most export options. If the drill files do not appear correct, check out our Drill File CAM configuration page for settings that we know will work correctly.

Slots

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Altium’s native Slot callout is supported. See our [slots][slots] guide for limitations and DRC requirements of slots.

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Common Issues

Missing Drill File

Altium keeps the drill data in the project-name.TXT file. Make sure any uploaded zip files include this file.

Drill file not being read correctly

Try exporting the drill file with the INCH units. Some format issues in METRIC are more difficult to reliably correct.

Internal Layer names

If you’re using a 4 layer stackup with both “power” and “signal” internal layers, Altium will generate the internal layers as GP1 and G1. Unfortunately, this makes it impossible for us to determine the correct layer order, since multiple layers identify themselves as “Internal Layer 1”.

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To correct this, simply rename the layers using the G2L and G3L extensions. The G2L will be near the Top Copper Layer, and G3L will be near the bottom layer.