Technology> Courses> ELNC1236 >Final Project Assembly


 

 

Example of the assembly of the final project.

 

 

Step1: PCB Manufacturing

 

This is the electrical layout of the PCB, produced in Autocad for this application. It is printed upsidedown onto a transparency.

 

Place transparency on UV lights, expose for 80 seconds.

Do not disturb, as it may make your exposure fuzzy.

Ensure ink is directly on board.

 

Place PCB into developper for 1 to 5 minutes until the green layer is removed showing your layout. LIGHTLY pass a foam brush on the surface.

Avoid over developping.

Rince PCB after developping in clean water. This will stop the developper.

Place PCB into tray and place tray into etcher. Etch for 2 to 5 minutes. When all the copper is removed, remove PCB from acid bath.

DO NOT OVER ETCH!! It can remove ALL copper from the board.

Close the lid and turn on etcher for 2 to 5 minutes.

This is Sodium Chloride with Merchloride Activator.

This image is of the control for the etcher. The top left switch turns on the heater, the bottom left dial controls how much time the sprayers will be activated.
Dry PCB and examine for defects.

Using the KEPRO shear, remove the top and bottom edges.

Be careful not to cut off too much material. It can be further removed with the belt sander.

Sand the excess material with the belt sander.

Make sure the vaccum is turned, wear safety glasses and pay close attention to what you are doing.

The belt sander can remove material VERY quickly. Work slowly.

Using a file, remove the excess material in the two corners. You will first have to use a hack saw to cut out the two front corners.

Use two blocks of wood to hold your PCB in the vice, as it will prevent damage.

When filing, press only while pushing. The file only cuts in one direction.

Using the sand paper, sand all edges and corners to remove any sharp edge.

Using the #70 drill bit of a Dremel, drill out every hole on your PCB.

Using the hole guide chart, drill out the larger holes.

Pay attention to the three PH (Pilot Holes) that are on your board. They must also be drilled.

Using the drill press, drill out all holes larger than 1.5mm. Pay close attention to which holes require which drill bit size.

Errors at this stage could be catastrophic. Pay close attention!!!

Mount your PCB into the TOP plate. Place all 6 screws. Drill out, using the 3mm drill bit, all 3 PH (Pilot Holes) into your case.

These holes will be further explanded later in the project.

Remove your PCB from the top plate. You are now ready to solder all components on your board.

Your final product looks like this once all components are soldered.

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