FAQ: How does SnapEDA create slotted holes in Orcad & Allegro

May 30, 2019faust

Q: The footprint I downloaded should have slotted holes in Allegro – why aren’t they appearing?

A: SnapEDA defines slotted holes for Allegro footprints using the layer Board Geometry > Ncroute-Path.

Q: How can I ensure that my PCB fabricator accurately makes the slots?

A: When sending your design to manufacturing, provide the NC Route file in addition to the NC Drill file to the PCB fabricator. Here’s how to generate the NC route file:

Instructions for Orcad/Allegro 16.6:

  1. Click on the Manufacture > NC > NC Route
  2. Click on Route.

Instructions for Orcad/Allegro 17.2:

  1. Click on the Export > NC Route
  2. Click on Route.

Q: I would prefer to see the slotted holes in my actual Allegro design. How can I do this?

A: You can manually modify the size and shape of the slotted hole to be defined as slots by following these steps:

Instructions for Orcad/Allegro 16.6:

  1. Click on Tools > Padstack > Modify Design Padstack
  2. Click over the slotted pad and right click > Edit
  3. In the Parameters tab, change the hole type to Oval Slot and input the value for Slot size (X & Y). (See Figure 1)
Figure 1: Padstack Parameters

4. Click File > Update to Design and Exit

For Orcad/Allegro 17.2:

  1. Click on Tools > Padstack > Modify Design Padstack
  2. Click over the slotted pad > Right click > Edit
  3. The Pad editor window will show. Click on Start tab and select Slot. (See Figure 2)
Figure 2: Pad Editor – Start tab

4. Go to Drill tab and in the Slot type, change it to Oval Slot then adjust the measurement of X and Y size. (See Figure 3)

Figure 3: Pad Editor – Drill tab

5. Click File > Update to Design and Exit

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