FAB-ISP Assembly
Machine: Roland Modela
Material: Copper
Design Software: Pre-made , FAB module
My first two attempts using the 1/64 mill on the ISP board's interior traces failed, as shown on the lower copper sheet above. The sacrificial layer was not fully adhered and raised at its lower left corner, where I orginally positioned the copper sheet. I moved the sheet to the center and again used double-stick tape to fix the board on the flatter part of the sacrificial layer.
The 1/64 and 1/32 mills correctly cut the intererior and exterior of the ISP board this second time around. However, my use of new mills resulted in burrs and one USB connection slightly raised. One swift medium-pressure swipe across the length of the board removed most burrs, kept the precarious USB connection intact, and even revealed the CBA logo more clearly.
Working from the center out, for each component I applied flux to all appropriate connections on the board and solder to one. I first attached the component to the soldered position and then followed by applying solder to the rest. I avoided bridges between solder until the last fixed component, the USB connector. I absorbed the bridge with a Desoldering braid with additional flux.
Neil pointed out that my crystal seemed nearly cooked and my first attempt to program my board failed. To rule out other possible causes I then touched up my solder job on every connection. My board was finally programmable (Dan did this with avrdude from his computer).
I removed my jumpers and inadvertently created another bridge. Since I also nearly stripped my board, I just removed this bridge with a razor (see top-middle of banner image). Will kindly re-soldered his jumpers so Adam and I could test our ability to program his ISP. We ran into the same error:
avrdude: initialization failed, rc=-1
Double check connections and try again, or use -F to override this check.
avrdude done. Thank you.
make: *** [fuse] Error 1
