Electronics Production

Objectives

Group (To redirect to the group assignment page Click here)¶

characterize the design rules for your in-house PCB production process

Individual

make an in-circuit programmer that includes a microcontroller:

extra credit: customize the design

mill and stuff the PCB

test it to verify that it works

milling the PCB

designing a PCB board- done in week-6

understanding and prepping the milling machine roland mdx

prepping the PCB board

connecting the milling machine using MODS

milling the PCB

selection of components

inventory

Soldering

equipment's for soldering

soldering practices

soldering

Programming using Arduino ADI

PCB design

During 6th week, we have done an electronics design utilizing attiny 412. Now, In order to manufacturing it, we had to choose a suitable production method.

In the week 6, I have created a design in Fusion 360, And now i am using that design in this production week.

***this was the PCB that i designed using fusion 360.**

Production Prerequisites

I had to export the file in the png format, in fusion 360 it was an easy process, i just had to type export in the command line

image here

i had to export it in two files

the complete design

the outer border which will be cut out from the rest of the board

The design

Milling the PCB

Roland Modela milling machine

The Roland Modela milling machine is a desktop-sized milling machine that is used for precision milling, drilling, and carving of a variety of materials such as plastic, wood, wax, and metal. It is manufactured by Roland DG Corporation, a Japanese manufacturer of digital fabrication tools and equipment

Setting up the machine

Since it is a basic milling machine we had to set it up for milling the pcb

selection of tools

For milling the PCB we have to use 0.4 and 0.8 mm bits.

0.4mm bit for tracing the paths and 0.8mm bit for cutting the outer border

Selection of PCB board

Here i used a stock size board of dimetions 70mm x 50mm it is a standard size

stick a double side tape on the other side of the PCB board

this is in order to stick the PCB to the bed of the milling machine

stick the pcb to the bed

Setting the jog height

first loosen the Allen keys and remove the existing bit

first we are using the 0.4mm for tracing, if we cut first the whole board will move around

insert the bit and tighten the Allen keys

now the move the spindle to the top of the pcb -the coordinates where 60x-15y for me

now reduce the z height to a level where it almost touches’ the board

loosen the bit and manually touch the board with the end of the bit

be careful as the bit is a bit expensive and might fall when loosening the allenkey, so first hold the bit and loosen the allen key, * note apply some pressure then tight the allenkey

Move the z axis, just by one press, this is to set the origin.

FABMOD

https://modsproject.org/ - for mods

As the machine only takes input in the form of G-code, we need to convert the PNG or SVG format into G-code. Luckily, we have mods, so the PNG files can be converted into G-code using mods. In the mods, we have to change the settings according to our machine.

We need to change the spindle RPM to 1400 RPM and the jog height to 0.5 mm. After selecting the tool for milling or cutting, we can hit calculate, and the G-code will be downloaded automatically.

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/0feda3e2-2f92-4080-a046-61428ac0df11/video_2023-03-22_17-55-06.mp4

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/cd2e19b3-cfe5-4993-a175-c21d0c7c4e3b/video_2023-03-22_17-55-00.mp4

selecting the components

since i used fusion 360 i was able to export the BOM

From the components list I selected the components from our inventory

our inventory was large there where a lot of components, it it took a bit of time

Components list

Soldering the components

The setup

equipment's

Soldering practices

*refer this link for good soldering practices

Here i started soldering small components first, then the smaller ones, as it would be harder to solder smaller components as it will be harder to asses the pads with larger components on top.