Thank you for the link! That's quite a bit to take in, actually. For one thing, I never realized the groove is done on both sides of the board, so my guess is that it needs to be defined twice then. I guess, I'm going to have to heed his advice: "The PCB designer should collaborate with the PCB fabrication shop..." Yeah, it does not seem like an "upload and get it accepted in 2 minutes" type of an option...
Cheers!
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They end-of-lifed their APU boards since AMD EOLed the old SoC they were using....
L
langwadt
e-for-pcb...
my
ve to
ation
very few boards, that isn't just cut out to a shape, but needs to panelized in some way to make pcb house and manufacturing happy, are ..
-Lasse
S
Spehro Pefhany
Actually, I think that's kind of a CYA statement by Mentor-- you should be able to do just that if it's just an outline of a rectangular board. PCB makers do a fair bit of manipulation of the files.
S
Spehro Pefhany
to
formatting link
...
to
fabrication
RU google translate?
L
langwadt
tive-for-pcb...
ne
so my
have to
rication
2
Maybe my fingers and my brain aren't always fully connected, but I don't think I've gotten a Google implant just yet :P
-Lasse
W
who where
There pricing used to be quite competitive with the other Chinese fab houses that will handle small volume orders and protos, but recently they jacked up their area rate (price per sq in) and it is now about four times one of their competitors. As many of my jobs are quite cost-sensitive (whose aren't?) I've reluctantly move away from them.
You get to select the factory turnaround time on the job entry form. Obviously faster is more expensive. The knee of the curve is the ten-day. And they have ALWAYS delivered on the promised day.
Quality is top-notch. And not only do they answer your questions, if they have any they will ask you. I haven't had any v-grooves from them, only fully routed out, but I can't see why double-sided v-grooving would require more than the normal mech layer board outline.
Talk to them.
W
who where
I often send (non-SM) proto panels to a particular board house whose price structure for HASL-only finish is competitive. (They aggregate and outsource, I'm sure). The last one incorporated quantities from
1-4 of six different designs. Before ordering I sought confirmation that they would not be separating the boards from the panel if treated as a one-setup-charge job, which they confirmed. "Separation will incur a per-design charge". I'm cool on separating protos here, so instead of using corner cut marks I moved the mech layer outlines to top copper - easier for us. They came back (from their outsourced fab house no doubt) bitching about copper on the outline ("must clear by
10 thou") and I expained that it was not an electrical issue for me and was what I wanted for separation.
That panel returned with no sign of my copper outlines - and no sign they were ever placed - and routed with the minutest breakout tabs I have ever seen. If I had known that was what they were going to do I would have approached the panelising differently, but I'll bet that it wouldn't happen that way a second time.
J
John Devereux
I just draw lines on the drill plot where I want the grooves, they sort it out. It only got tricky when I was doing manual "breaking" of the boards.
"I want the groove deep enough so I can break them easily without stressing the parts, but not so deep they all fall apart during pick and place"...
They could embedd tiny strips of cordite on inner layers.
John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators
K
krw
to
fabrication
Or just use a chain saw to separate them.
J
John Larkin
my
to
fabrication
How about grooves with pcb traces under them. Run enough current to soften up the epoxy.
John Larkin Highland Technology, Inc
jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser drivers and controllers
Photonics and fiberoptic TTL data links
VME thermocouple, LVDT, synchro acquisition and simulation
K
krw
my
have to
fabrication
Traces on every layer with a *lot* of vias between them?
J
John Larkin
my
have to
fabrication
One skinny trace on one layer, inner or bottom side, should do it.
Or use a picosecond laser to slice things up. Lots of people, probably too many people, are making fast lasers for materials processing nowadays. Somebody has a 500 watt CW vicsel! That's a weapon.
For small lots, there's the Dremel circular saws, good for finishing off the almost-routed boards like I posted. A small Dremel-based table router would work, too.
John Larkin Highland Technology, Inc
jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser drivers and controllers
Photonics and fiberoptic TTL data links
VME thermocouple, LVDT, synchro acquisition and simulation
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