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Thread: Preparing for COB factory process

24 Discord messages from 📐 - Designing/📦-cob/threads/preparing-for-cob-factory-process.md.

Category: 📐 - Designing Parent channel: #📦-cob Thread ID: 1492424810742026341

Messages: 24

message-1492424816865706025

2026-04-11T07:23:24.253+00:00 — stuart (@saladchap)

Content

@Tim 'mithro' Ansell @Andrew Wingate do we have a plan for how to keep the different die from getting mixed up after division / sorting through to shipping?
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message-1492425005894471690

2026-04-11T07:24:09.321+00:00 — stuart (@saladchap)

Content

afaicr there are reference codes for each die, is the plan to have labels on the reels / waffle packs / however the die will be packed after the sorting?
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message-1492425083795407009

2026-04-11T07:24:27.894+00:00 — Tim 'mithro' Ansell (@mithro_)

Content

Currently I'm planning to vacuum seal the reels with labels and instruction in them.
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message-1492425170777018505

2026-04-11T07:24:48.632+00:00 — Andrew Wingate (@anfroholic)

Content

Also we're going to have some information on the reels themselves.
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message-1492425988284350637

2026-04-11T07:28:03.541+00:00 — stuart (@saladchap)

Content

I'm mostly concerned about them getting mixed up during the wire bonding - from past experience the factory:

attaches the die to the PCBs
PCBs with die go into trays like this
next the wire bonding
bonded boards go back into trays
trays of bonded boards go for the glob top glue
glue added then baked

See above photo from when we did the last TT08 COB

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message-1492426406146085037

2026-04-11T07:29:43.167+00:00 — stuart (@saladchap)

Content

IMO it would be good if we can mark or label the PCBs somehow with the same die ID -  small labels for the panels would work until they get baked (unless the labels are heatproof)
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message-1492426552187555847

2026-04-11T07:30:17.986+00:00 — Andrew Wingate (@anfroholic)

Content

I will put some more thought into this when I have a little more bandwidth.
We can add some extra stickers and stuff in with the envelopes if we think that would help.
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message-1492427224778018917

2026-04-11T07:32:58.344+00:00 — stuart (@saladchap)

Content

But do we want to have something on each individual PCB too? Or would we ship panels to customers?

Either way IMO it would be worth having some mark or label on each 'unit' (PCB or panel) to help when it comes to shipping
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message-1492432276783628309

2026-04-11T07:53:02.836+00:00 — Andrew Wingate (@anfroholic)

Content

I'm in favor of shipping whole panels. The cob are small, we would have to put them in tape or something
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message-1492432561304113172

2026-04-11T07:54:10.671+00:00 — Andrew Wingate (@anfroholic)

Content

I think I can come up with some more robust solutions for Run 2.
Also keep in mind these are coming back through Tim and my hands before they're shipped off.

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message-1492713030071488754

2026-04-12T02:28:39.636+00:00 — Tim 'mithro' Ansell (@mithro_)

Content

I hadn't really thought about shipment after CoB mounting.
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message-1492713238423535617

2026-04-12T02:29:29.311+00:00 — Tim 'mithro' Ansell (@mithro_)

Content

@stuart / @Andrew Wingate - I assume we where not smart enough to put an area on the panels where the project type could be written?
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message-1492713380560244866

2026-04-12T02:30:03.199+00:00 — Andrew Wingate (@anfroholic)

Content

There's space
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message-1492713797935431742

2026-04-12T02:31:42.709+00:00 — Andrew Wingate (@anfroholic)

Reply/reference

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Content

There's tons of space around the outside

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message-1492714172465676399

2026-04-12T02:33:12.004+00:00 — Andrew Wingate (@anfroholic)

Content

Have all the boards been ordered?
We could put a silkscreen rectangle somewhere so it's white and could be written on with a marker
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message-1492714320872607784

2026-04-12T02:33:47.387+00:00 — Tim 'mithro' Ansell (@mithro_)

Content

We should put a white silkscreen area which is easy to write on?
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message-1492714534039851109

2026-04-12T02:34:38.21+00:00 — Andrew Wingate (@anfroholic)

Content

Yeah, that's what I just asked.
Has @stuart placed the order for all the panels yet?
We still have time I think?
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message-1492714566189318284

2026-04-12T02:34:45.875+00:00 — Tim 'mithro' Ansell (@mithro_)

Content

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message-1492714715951136891

2026-04-12T02:35:21.581+00:00 — Tim 'mithro' Ansell (@mithro_)

Content

Maybe should have an area for a sticker that we can prepare some of those?
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message-1492714793633583227

2026-04-12T02:35:40.102+00:00 — Andrew Wingate (@anfroholic)

Content

I was worried about a sticker with the oven part of it all.
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message-1492714843092943069

2026-04-12T02:35:51.894+00:00 — Andrew Wingate (@anfroholic)

Content

Not sure what temp epoxy gets baked at
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message-1492714967659712633

2026-04-12T02:36:21.593+00:00 — Andrew Wingate (@anfroholic)

Content

but yes, it could/would still help a lot up until that point
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message-1492774297360666684

2026-04-12T06:32:06.896+00:00 — stuart (@saladchap)

Content

We haven't ordered the second batch of panels yet so if you can add an extra white area please do so @Andrew Wingate
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message-1492774930142466048

2026-04-12T06:34:37.763+00:00 — stuart (@saladchap)

Content

Actually please add two white parts as I just checked and the factory will most likely be splitting the panels into two parts for COB

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