03-01-2013, 01:34 PM
PCB Design Guide Sheet
1PCB Design.pdf (Size: 976.29 KB / Downloads: 51)
CAD System
Recommended software is Altium. We are using it ,since it is thought as a powerful tool in
designing PCB layout because of its availability of enhanced features like improved interactive
routing,user selectable track width,internal routing loops,PCB routing completion
detector,preserving track angles while dragging,designing bottom layer layout (mirror has to
done) just by flip and editing the board etc., .
CNC drilling/milling machine
A computer automated ,single spindle CNC machine is used which allows direct processing of
Excellon/Sieb&Meyer drill data or HP/GL data for PCB production (drilling, milling, isolation
routing) and milling/drilling of holes ,selection of drill bit is also automated and moves to the
corresponding coordinate to make a drill. Likewise drills of different dia can be made.
Photo plotter
With this photoplotter films are developed for layers and the solder masks .More over both
positive and negative type films can be developed. This is also computer automated equipment.
It plots images from a CAD database by using Gerber data file on photographic film.
Here film is rolled over inner drum. On running the software in computer the laser diode moves
step by step along the rotating drum by means of stepper motor driven lead screw. Moreover
laser diode moving speed, resolution can also be adjustable as per requirement.
Film Developer
Taking after from photoplotter ,layer film is produced by a developer machine. Then under light
table the film is inspected for any track breaks, line shortages or missing of any track. Here we
are developing films manually in a tray.
Brushing Machine
After completion of drilling, boards are to be brushed thoroughly to ensure no stray particles on
the board. Boards are brushed thoroughly ,rinsed and dried by this wet brushing machine.
Laminator
This is used to laminate the entire board area with photoresist material. Here either positive or
negative photoresist material can be used for Laminating the board. We generally use negative
photo resist. Lamination is performed by rolling photoresist coil under pressure on both sides of
the moving board by heatable feed rollers. However rotational speed is adjustable as per
requirement.
Plating unit
This unit is used for making printed through hole(PTH) circuit boards, where connectivity from
top to bottom layer can be made through holes. Here top and bottom layers are connected by
depositing copper in holes of the board. This unit comprises all the tanks and equipment for
degreasing, rinsing, catalyzing, activating, pickling and plating drilled and cleaned boards. These
process of degreasing, rinsing, catalyzing, activating, pickling are used for removing grease, oil,
dirt, soot and other contaminants from surfaces. After thorough cleaning only it deposits copper.