Altium Board Slots

Define an oval slot-type cut? -Justin I had to create oval holes in a project at work though I was using. Altium and not Eagle. What I did was overlap three holes so it looked. Like an oval shape. The board house we used was Prototron Circuits. They seemed to know what I wanted though they did call and ask just to.

1. Altium’s native Slot callout is supported. See our slotsslots guide for limitations and DRC requirements of slots. 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.
2. 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.
3. Board Planning Mode - when viewing the board in planning mode, the following commands are available from the main Design menu: Redefine Board Shape - use this command to interactively draw a new shape. Edit Board Shape - use this command to interactively modify the shape of the board by moving vertices or sliding the edges of the shape.
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In addition to the relatively small holes required for Through Hole PCB Assembly and the mounting holes located on a board, many PCBs also specify Slots and Cutouts, also known as Internal Routing. These names are used to refer to holes in the PCB that are too large or irregularly shaped to be created by normal drilling methods, and must instead be cut out with a routing bit during PCB Fabrication. Internal routing holes can be either plated or non-plated, as per the client’s request, since these holes are sometimes used to connect the board to other PCBs, or to the chassis of a device.

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At Bittele Electronics, we sometimes receive questions from clients who wonder whether the presence of slots or cutouts in their PCB will act to increase the price or lead time of their project. Thanks to the flexible and comprehensive nature of our PCB Assembly Process, we are able to assure these clients that their slots and cutouts will cost them no more than a regular drill hole in the PCB.
The only additional thing to keep in mind when specifying internal routing on your PCB is that, while not particularly uncommon, these types of holes are not exactly standard either. As such, it would be beneficial to call attention to these features in a mechanical layer of your Gerber Files, and perhaps in your initial email to Bittele, along with your PCB Design Files.

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For detailed information regarding the design of internal routing, please see our comprehensive guide on Best Practices for Plated Slots, which also covers non-plated internal routing practices.
You can also Contact Us with any further questions. Feel free to reach out over email at sales@7pcb.com any time, or call us toll-free at 1-888-812-1949.
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Slots, milling, contour and rout-outs have to be indicated clearly to be processed correctly in production.

• Do not indicate them in your cupper layers or textprint layers
• Do not indicate them by putting text outside your layout
• Do not indicate them by adding a textfile or any other document together with your datafiles.

But

• Do indicate the slots, milling and routing information into a mechanical layer. A mechanical layer consists of the border of the PCB, together with any other mechanical finishings like extra milling, routing or slots.
• 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. The contour layer has to have the same offset as the other copper layers in order to align copper and routing together.
• Properly aligned layers – correct offset to the contour layer
• Not correctly aligned layers – incorrect offset to the contour layer
• Example of acceptable drillmap file indicating slots
• • Note that the contour layer is drawn with a normal linewidth (0.2 mm). Do not use the thickness of the router to avoid confusion about the correct dimensions of the PCB. We consider the midpoint of the line as indicator of the correct dimension.
  • Slots will be PTH when copper pads are present on top and bottom layer (comparable rule as with normal plated through holes).
  • Slots will be NPTH when no copper pads are present on top and bottom layer (comparable with normal non-plated through holes).
  • When you need a NPTH slot and copper pads are present, then you will have to indicate this clearly in your design – see example below:

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