Importing 274X Gerbers

Example of Importing Top Layer 274x Gerber data into Altium.

Open the Top Gerber layer in CAMTastic.

Add a new layer to the CAM file and name it drill. Edit > Layers > Add

Go to Tables > NC Tools and create a new small drill, example 10 mil.  

Set CAMTastic to drill mode by going to View > NC Editor. 

In NC Editor Mode go to Place > Drill > Point and place a small drill inside one of the mounting hole flashes.

Tables > Layers, set Top to Top and set Drill to Drill Int.

Tables > Layers order, click the Physical Layers column for top and set it to 1.

Tables > Layers > Enable (Select On) for the layers to export.

Go to Tools > Netlist > Extract.

Select File > Export > Export to PCB.

Done !

Tip: Go to Tables > Layers > Review the Type column after the layer name.  You need at least one layer to be the Top layer.  If all of your copper layers are Internal...it will not export. Be sure to specify at least one drill layer as Drill Top if you are importing drills into Camtastic. 

Links: CAM Editor Reverse Engineering PCBs | Altium