Minco can accept CAD data in the following forms:
Gerber photoplotter code: Embedded aperture code
(RS-274-X) format, or with separate, detailed aperture
Other forms may be acceptablecontact Minco for
Minco accepts transfer media in the following forms,
which are listed in order of preference:
E-mail: Ask Minco Sales Engineer for address
FTP: Ask Minco Sales Engineer for address
Floppy (3½"), Zip disk, or CD: IBM-PC format
Guidelines for all formats:
Single entity draws for conductors are required.
Single pad flashes are required.
Minimum entities for conductor to pad transitions
(`fillets') are preferred.
Guidelines for DXF:
Place artwork data, part outline, hole centers,
soldermask, coverlay, silkscreen marking, etc. on
separate, individual CAD system layers.
Polygons or zero width line draws for irregular pad
shapes and shield area outlines are preferred instead
of filling in these shapes.
Supply arcs and circles. Do not convert arcs or
circles into segmented lines.
Avoid supplying only conductor outlines, as it
increases set-up cost. If you do supply conductor
outlines, include a supporting CAD system layer with
proper line width conductors and pads.
Guidelines for Gerber:
Incremental or absolute absolute is preferred.
2.3 or 2.4 data. We prefer 2.4, which specifies 2 digits
to the left of the decimal point and 4 to the right.
The decimal point may or may not be omitted we
prefer that it be omitted.
Leading/trailing zeros may be present or omitted we
prefer that the leading zeros be omitted.
We prefer character code 7-bit ASCII, but 8-bit ASCII,
EBCDIC, EIA, or BCD is acceptable.
Commands may be terminated with an asterisk (*) or
a dollar sign ($) we prefer the asterisk.
Each coordinate is followed by:
D01 Draw line
D02 Move without drawing
D03 Flash a pad
Example of a preferred format:
Line draws require `Round' apertures be used.
Pad flashes may use `Round,' `Square,' `Oval,' and
`Rectangular' apertures. Any other special shapes
must be accompanied by a detailed drawing of the
When conductors change direction, chamfer or radius
corners. All outside conductor corners will have a
radius equal to one half the conductor width.
Large copper planes or shielded areas should have
as few fill lines as possible. Do not supply files with
`redundant' fill patterns (i.e. overlapping vertical and
horizontal fill lines). If Gerber conversion allows,
specify the following fill apertures to be used:
Fill #1 0.005
Fill #2 0.010
Fill #3 0.020
Fill #4 0.050
Fill #5 0.100
When sending your photoplotter code, please include:
The format of the data
An aperture wheel listing (when required)
The number of files supplied and their
correspondences to the circuit layers.
Below is an example of the information to include with
your photoplotter code. For best service, please
provide all the following file information:
Data Type -- Gerber
Character code -- 7-bit ASCII
Format -- 2.4 absolute
Decimal point -- Suppressed
End of block character -- *
Zero suppress -- Leading
.060 x .040 Oval
.065 x .045 Rect.
6 files on disk:
Artwork Layer 1
Artwork Layer 2
Silk Screen Layer 1
Silk Screen Layer 2
Gerber Wheel List
Application Aid #24
Tel: (763) 571-3121 K Fax: (763) 571-0927 K www.minco.com