It smell something… sniff sniff … yes, I smell BS!
Initially I was pretty happy when these boards finally arrived. They looked reasonable, nothing was raising my suspicion – BIG mistake.
Now the Chinese New Year is upon us once again. No chance to get a quick fix I suppose. Oh well…
Let’s play a little game. It is called “Will it fit?”
The piece of wire is exactly 0.80mm thick. The finished diameter of the holes should be 0.80mm as well. Who would have guessed, right?
As you can see for yourselves, it doesn’t quite fit.
Same BS viewed from the other side. The pin width of this microMaTch connector is 0.60mm [verified], so it should go in.
Something is obviously wrong. I did think about the HASL process, which is a bit notorious for leaving too much solder behind, but that wasn’t the main issue here. I managed to insert a drill into one of the holes. The drill is exactly 0.58mm wide. It was a very close fit.
I ran a 0.72mm drill through 4 of these holes to see if this was a viable option. One hole still seems to have some copper left, but the remaining three were destroyed in the process – sigh.
So what happened in the factory? Under-sized drills, excessive copper plating… who knows. One thing I know for sure is that IT SUCKS!
Oh, just in case, the gerber files are OK.
I don’t see any fault on my side. Let’s see if I can get replacements boards.