Convert PHO to DRL

Understanding the PHO and DRL file formats

PHO files are typically associated with Gerber photoplotter files used in PCB (Printed Circuit Board) manufacturing. These files contain information for creating the photomasks used in the PCB fabrication process, such as copper layers, solder masks, and silkscreens.

DRL files are Excellon drill files, also used in PCB manufacturing. They specify the locations, sizes, and types of holes to be drilled in the PCB, such as vias and mounting holes. DRL files are essential for the drilling stage of PCB production.

Why convert PHO to DRL?

Converting a PHO file to a DRL file is necessary when you need to extract or generate drill information from a photoplotter file, especially if the original design did not include a separate drill file. This conversion is crucial for ensuring that the PCB can be manufactured with the correct hole placements.

How to convert PHO to DRL

Direct conversion from PHO to DRL is not always straightforward, as these files serve different purposes. However, you can use PCB design software to import the PHO file, interpret the layer data, and then export the drill information as a DRL file.

Recommended software for PHO to DRL conversion

• KiCad: An open-source PCB design suite that can import Gerber (PHO) files and generate DRL files. Use File → Import → Gerber to load your PHO file, then use File → Plot and select Drill Files to export as DRL.
• Altium Designer: A professional PCB design tool that supports both PHO and DRL formats. Import your PHO file via File → Import, then use File → Fabrication Outputs → NC Drill Files to create a DRL file.
• GerbView: A Gerber viewer and converter that can help visualize PHO files and, in some cases, export drill data if present.

Step-by-step conversion using KiCad

1. Open KiCad and create a new project.
2. Go to File → Import → Gerber and select your PHO file.
3. Review the imported layers and ensure the drill locations are visible.
4. Go to File → Plot and choose Drill Files to export the DRL file.

Tips and considerations

• Ensure your PHO file contains clear drill markings; otherwise, the DRL file may be incomplete.
• Always verify the generated DRL file using a Gerber/Excellon viewer before sending it for manufacturing.
• If the PHO file does not contain drill data, you may need to manually add drill points in your PCB design software.