Difference between revisions of "PCB-assembly"

Revision as of 15:19, 11 September 2023

HSGR PCB assembly tools

Stencil Printer

Our stencil printer is based on https://dengler-mechatronik.de/?p=560. In the the above photo you check the modifications:

Stencil Printer

Other Tools:

1. squeegee, use it softly and slowly as is referred in to solder paste datasheet
2. small plastic spatula or stick, to stir the solder paste
3. isopropyl alcohol and paper towel to clean everything
4. M3 allen key wrench, to install the stencil
5. Microscope Camera with USB interface, use it with VLC in order to check the alignment of PCB and stencil

Manual Pick and Place

Our Pick and Place is https://www.eurocircuits.com/blog/ec-placer/ with 2 cameras and a in-house software: https://gitlab.com/hsgr/lab/ec-placer-camera-viewer. The set-up needs 2 monitors:

1. 1st for Pick and Place cameras
2. 2nd for interactive BOM, https://github.com/openscopeproject/InteractiveHtmlBom

Pick and Place

Other Tools:

1. PCB vice: https://gitlab.com/thanos.husk/tiny-vice
2. all the grounding - ESD connections, Pick and Place and user
3. SMD feeders: https://www.thingiverse.com/thing:2414955/files

Reflow Oven

The model of reflow oven is puhui T-962. There are some improvements base on https://github.com/UnifiedEngineering/T-962-improvements/wiki:

1. Flashing the LPC21xx controller
2. Dallas 18B20 for cold junction mod
3. Kapton tape was added for better thermal inslulation
4. Improve grounding
5. Use Custom 2 profile

Reflow Oven and Ultra sonic Cleaner

Other Tools:

1. Use M4 nuts to place PCB in to oven base
2. Calibration process: https://github.com/UnifiedEngineering/T-962-improvements/wiki/calibration

Ultrasonic Cleaner

It is a 2.0L ultrasonic cleaner. The model is JP-010S. For flight models (space) it is not recommended to clean it with this. Use isopropyl alcohol to clean PCBs.