Tiny85 spi controller

View this project on CADLAB.io.

pcbs

Repo for pcb layouts, gerber and gcode files

Ki-Cad

PCB layout:

• Use as wide traces as possible. 1mm preffered.
• Dont use "filled areas" if possible. It does not make good geometry in flatcam
• Don't forget to set origin marker
• Export gerber: use auxiliary axis

FlatCam

geometry generation:

• If you are using thru-hole components or using bottom layer, mirror around y axis for both geometry and Drilling
• Edit drill files if necessary for fewer drill sizes
• TODO: test double sided layout by mirroring around center axis!

Isolation generation:

• Current isolation mill depth to test: 0.04 mm (0.05 was tested and seems to work fine!) (Common copper depth is about 0.03 mm)

• Current feedrate on isolation milling to test: 60 mm/s

• spindle speed 12000 rpm

• use 0.2 mm tool width on cnc generation

• 2 passes with 0.1 overlap

Cutout generation:

• Current cutout mill depth: 1.6 mm
• Current feedrate on cutout milling: 40 mm/s
• spindle speed 12000 rpm

FlatCam defaults:

• put a link in ~/.FlatCAM/defaults.json

bCNC

Probe:

• Fastfeed: 120
• Probefeed: 25
• Probe points: 4/cm (in each direction)

Drilling:

• Current drill plunge rate to test 20 mm/s
• spindle speed: 12000 rpm
• Drill depth: 1.6