75_OSH Stencils
The stencils from OSH stencils came in this week. The alternative to using these was to place solder manually on the PCB pads. Figure 1 shows the stencil for the Motor Control PCB and Figure 2 the stencil for the processing PCB.
Figure 1: OSH-Stencils stencil for Motor Control PCB
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Figure 2: OSH-Stencils stencil for Processing PCB
I taped the stencils over the PCB’s and spread some solder paste over the film, filling the pad pockets. After finishing and removing the stencil, the pad paste on the pcbs ended up touching each other.
Even though the width calibration partially fixed the milling problem previously mentioned, the traces and pads on the PCB’s were still thinner than expected. Because of this, the stencil holes were a bit larger than the actual pads. This was okay though. I just scraped out the extra solder in-between each of the 390 pads on the boards.
After that, I started using the Pick-&-Place to place parts on the pasted pads.
