-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On Wed, 3 Jul 2019 09:03:44 +0100 Luke Kenneth Casson Leighton <[email protected]> wrote: > ---------- Forwarded message --------- > From: Luke Kenneth Casson Leighton <[email protected]> > Date: Wed, Jul 3, 2019 at 8:16 AM > Subject: [eoma68 update] report back from factory on HDMI > > Mike's staff began the PCB assembly of the run of 100, and had to stop > at 36. 20 were ok: 16 of them, the HDMI connector refused to fit. > The reason: the CNC machining on the edge of the PCB has not been done > accurately enough: it's simply too ragged. The staff did some > experimentation, cleaning up some of the edges in the cut-out with an > xacto-knife: this did the trick, even though it is shaving something > like 0.01mm off the ragged edge of the PCB. > > The left and right edges do not matter too much, however where the > HDMI connector comes in close, it definitely does. Mike is going to > talk to the PCB factory to see if there is anything that they can do > in future, however with 1,000 PCBs already manufactured, the safest > thing to do is probably to *hand-trim* that PCB edge, removing the > burrs, on all 1,000 PCBs. > > Again, to reiterate, because I am still seeing evidence of > "complaints" out there, from people who believe this should be easy: > these are absolutely ridiculously tiny components and tolerances, and > the budget on which it's being done is equally as frugal. 0.05mm on > the edge of a PCB. 0.2 mm wide pins, with 0.2mm clearance between > them. A "normal" Single-Board Computer product from any other > well-funded Corporation would use large (Type A) HDMI, top-mounted, > with plenty of tolerances and no need for the PCB edge to be > accurately milled. > > Again, to reiterate: we do not know what will need to be solved next. > Therefore, a production date simply cannot be provided, and that > really is the end of the matter. Or, the answer is: the production > date is "the production time plus the unknown time to solve unknown > and unknowable future issues". > > Mike is sending me the 20 "good" PCBs so that I can test them here, to > see if they are okay. The staff will continue with the rest by > shaving the burrs on the PCB on every single one of the remaining 80 > with an xacto-knife, before putting them through the production line. > It is looking like I will need to do the testing of all 100 of this > preliminary production run, here, at my home, in Taiwan.
Maybe you should be focusing on FLOSS PCB tooling instead of Laptops. (-; More seriously, from my experience it seems as though a lot of the "professional" tools have major design problems. As though the engineers gave up halfway through at the "test it in the real world" phase. Sincerely, David -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEL2N7+xWmVOJDQxWGm3XCrhg2YP8FAl0dWdMACgkQm3XCrhg2 YP+Q4g/+IldjAr3N/5rlmvIkMqnqIVOzJEiOkIgArnSvvtyvSZ8SGCzMdaQH7f3O KDROpePP1M0YFkRJpXDw6sdq6Wn3ACMzRhrwEzmFGXgLiATk1YdLgafj4qYbcaPO bBpfruG28l75xPio7WUPXp1zZ/oXKm62sveHRPD+PVXHJaxzwjpaDENOleqrLOTJ REc43PCJmsY9eiSu+XPGJUQ+WoE44U1krEssOMD/NB+lHmIblJYXzkDw9NIiNNRv 1ETQ3W4qOQT0Hvh3QNn1o6qs9QIGxKuZXP0jbuym4o3UkaINwos50SyCchgsOEP3 FBDP8vGungLpTVvLjQ18fAWLGibDptkD8IlRWDLARgP7Toi5d65b3B9JWEtcZ3Qq T4L2+9tYBk0PW8dfuxpqnvZcBT19k5Z2lPIb95z85jx7EQjwzJb9yvgkkiY7zAQ2 dEVtP82YgPzdJTn+by96uNJUJ0/Ev0dCX6V0wYM+/8rERsl8ZPBhmrK2jU2ir3qw NTYE34VIBt5eeAI/WtwCqqfXLDYbfmbvI8NHERCnFifon49XXadSIC7WglqSi1mu +x7RB9ehH7lrjNyPZvuj51neR/rHHWmfg53GDIL2ReqXx7yKZsDM1LdmyYhRrohp VMMvYmutVxpv6TEHjsKLVwtPeOLTd420etJynxe/bQek+Gyku3Y= =cbik -----END PGP SIGNATURE----- _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
