cadsoft eagle 4.5 Manual De Usuario

RS-274D, or subsets of it, is the commonest format, which can be gene-

rated with the CAM Processor. Therefore choose the devices GERBER

and GERBERAUTO. In this case a file with the associated aperture ta-

ble must be supplied, in addition to the files with the plot data. All the

further explanations in this section are based on this format.

Drill Data

The generation of drill data is very similar to the generation of photo-

plot data. The aim is to create files which are sent to the board manufac-

turer. The appropriate device drivers are SM1000, SM3000, and

EXCELLON resp. EXCELLON_RACK. A drill configuration has to

be defined before an output can be generated. The manufacturer must

know this configuration, otherwise he cannot drill the proper holes. It is

therefore advisable to send the drill rack configuration file along with

the drill data file(s) to the manufacturer.
Since EAGLE 4.11r2 the EXCELLON device writes the rack file infor-

mation into the drill data file automatically. So you do not have to care

about the rack file as it was in previous versions with the EXCELLON

device.

The device EXCELLON_RACK works with a separate rack file as it is

with SM1000 and SM3000 (and was with EXCELLON in earlier

EAGLE versions).
EAGLE generates drill holes for the objects pads, vias, and holes. The

appropriate data for pads and vias (plated-through holes) are generated

if layer 44, Drills, is active during the CAM Processor output session.

The data for holes (with no contact between different layers) are gener-

ated if layer 45, Holes, is active. Both layers must be active if all holes

should be drilled together. If they should be drilled separately, either the

Holes or the Drills layer must be active, and two separate files created.
A tolerance can be specified for drills. In such cases please make sure

that your Design Rules are maintained.
The Rotate option given in the configuration is useful if the board ap-

pears in the Layout Editor in landscape format.

Data for Milling Machines

Data used by milling machines are normally drawn in layer 46, Milling.

This is where, for example, the contours of board cut-outs are drawn.

The output is made via the CAM Processor in Gerber or HPGL format.

Agree the required format with your board manufacturer beforehand.

You can generate outline data for milling a prototype board with the

help of the User Language programs.

212

EAGLE Manual