I began my career as an electronics integration technician for the Apollo Space Program in 1972.
How's that for really old? I was very young and depended a lot on Divine Guidance.
But God was just a kid.
Odin
-----Original Message-----
From: TechNet On Behalf Of Roger Mack
Sent: Tuesday, December 12, 2023 8:44 AM
To: [log in to unmask]
Subject: Re: [TN] IPC STD 7351
Similar memories from the days when machines were programmed by paper tape, but now with tiny parts, silkscreen results in another irregular layer that causes poor stencil gasketing. We have virtually eliminated it. Also production uses interactive drawing packages that can quickly point the drawing to any designator they are looking for so nobody is missing it.
Roger Mack
-----Original Message-----
From: TechNet On Behalf Of Decker, Scott S Collins
Sent: Tuesday, December 12, 2023 07:28
To: [log in to unmask]
Subject: [EXT] Re: [TN] IPC STD 7351
Victor,
I'd like to say I'm old school too but I think Old is enough... ?? OK, so maybe not THAT old, but old enough to say I agree that I'm a 70's-90's guy and remember the fun I had doing wire-wrap boards with the Standard Pneumatic CSW gun and bit. What a blast that was at the time. Matter of fact, I worked for the same company years after and even worked on some of the electric screwdriver designs they had back then. I have no idea if they are still doing that but the main company was where I worked and started doing board design in 1990. Fun stuff back then, now you almost can't tinker in electronics without a microscope and reflow station... :-\ Have a great Day...
Scott Decker
Lead Tech, Engineering Services CID+
[log in to unmask]
KE7MWT
Collins Aerospace | An RTX Business
Missions Systems
(GMT -7, MST) Remote In Phoenix Arizona. U.S.A
https://urldefense.com/v3/__https://linkprotect.cudasvc.com/url?a=https*3a*2f*2fcollinsaerospace.com&c=E,1,YmTnPJq8Ui3nEqYjdYyxn1X81jiLyostquoFkpdvQEEZlGskknCKc6bRvYRf2_KtPaUhCXwSSVZdvmJAaCBIBZqCFWZM6nvPtNpdQzaK&typo=1__;JSUl!!PhQDkBqkFGE!nQbnkHtGKcCnUSoGvrTTQrU5g1RBwmQ3C4V031Vq2U8r_gG_a3L162woP6j-ZyB6PMjwIwm_v8cDaosiLitFhbcdHjT72_9apw$ | LinkedIn | Twitter | Instagram | Facebook | YouTube
-----Original Message-----
From: Hernandez, Victor G
Sent: Monday, December 11, 2023 18:05
To: Decker, Scott S Collins
Cc: Hernandez, Victor G
Subject: [External] RE: IPC STD 7351
Scott,
Thank you very much for sharing your insight. I agree that everything is getting miniaturized, just like axial leaded to WMT format.
A sign of the new times/era.
I am old school from the seventies.
Victor,
Internal Use - Confidential
-----Original Message-----
From: Decker, Scott S Collins
Sent: Monday, December 11, 2023 2:53 PM
To: Hernandez, Victor G
Subject: RE: IPC STD 7351
[EXTERNAL EMAIL]
Victor,
Indeed, we don't put them on many boards here since there are tools to identify parts etc. That said, when the parts are so small that the minimum size Silkscreen is 2X larger than the part, it's impossible to even put it on a board at least readable that is. Not much info when it's a small dot/blob. ?? I'm waiting for the day that the ref des are a QR code with part number and related info imbedded, but I don't see that anytime soon either. What a concept though... Anyway, I am one that tries to put SS on all my boards if at all possible. I've been on the end of a scope probe and meter and really like knowing what parts I'm probing, but things have changed a lot since then, now I'm just putting copper down and not testing it or even seeing it anymore... Don't be surprised if you don't see Silkscreen on boards, sometimes it's just not doable. Happy holidays to you...
Scott Decker
Lead Tech, Engineering Services CID+
[log in to unmask]
KE7MWT
Collins Aerospace | An RTX Business
Missions Systems
(GMT -7, MST) Remote In Phoenix Arizona. U.S.A
https://urldefense.com/v3/__https://linkprotect.cudasvc.com/url?a=https*3a*2f*2fcollinsaerospace.com&c=E,1,8P06QtfoYug3mTm4p9Pq_5VtiZWbGIfmwg-mRFBWsRUv7b8W6APq-T82Im4FJncpIplB2M2-f7ls054ks9D0SqXCFi2uYQ0LGecsVaCKLQbAM7ETKJVbwhk-Sw,,&typo=1__;JSUl!!PhQDkBqkFGE!nQbnkHtGKcCnUSoGvrTTQrU5g1RBwmQ3C4V031Vq2U8r_gG_a3L162woP6j-ZyB6PMjwIwm_v8cDaosiLitFhbcdHjTYKh-3wQ$ | LinkedIn | Twitter | Instagram | Facebook | YouTube
Internal Use - Confidential
-----Original Message-----
From: Hernandez, Victor G
Sent: Monday, December 11, 2023 12:46
To: Decker, Scott S Collins
Cc: Hernandez, Victor G
Subject: [External] RE: IPC STD 7351
Scott,
In my case the vendor did not use a silk screen identifier for components That is what caused the inquiry.
Victor,
Internal Use - Confidential
-----Original Message-----
From: Decker, Scott S Collins <[log in to unmask]>
Sent: Monday, December 11, 2023 12:51 PM
To: [log in to unmask]; Hernandez, Victor G
Subject: RE: IPC STD 7351
[EXTERNAL EMAIL]
Victor,
I don't know of any guideline that specifies white or any other color for that matter. There are many different colors including different colors of solder mask, so it is an open field for color choice. That said, it's best to check with your fabricators and assemblers to make sure the color(s) you want on the PCB are available and at what extra cost or time if any. And you might check with the assembly shop to ensure any automation equipment they might use doesn't have any issues with colors and such. I don't know of any issues, other than availability of the mask and silkscreen colors that are different from main stream. It was once said that you can have any color silkscreen as long as it's white or maybe it was you can have any color solder mast as long as it's green. In either case, you have a choice, but I don't know of any standard for a specific color. For that matter, many boards don't even have silkscreen on them anymore. A typical note might say that the Silkscreen must be of a contrasting color from the solder mask, but that's a per company thing.
Later...
Scott Decker
Lead Tech, Engineering Services CID+
O: +1 319.263.8289
C: +1 480.438.4730
[log in to unmask]
KE7MWT
Collins Aerospace | An RTX Business
Missions Systems
(GMT -7, MST) Remote In Phoenix Arizona. U.S.A
https://urldefense.com/v3/__https://linkprotect.cudasvc.com/url?a=https*3a*2f*2fcollinsaerospace.com&c=E,1,JxilFSOCoCpRg4QvIbItXsIuDHkvXGrNemF64JSVq-uW4jltn0rdDPIfRseVzsCXKbYDNeX0jIzED2vkbPsSw7oBrk_T1N4JxxzlqwzINw,,&typo=1__;JSUl!!PhQDkBqkFGE!nQbnkHtGKcCnUSoGvrTTQrU5g1RBwmQ3C4V031Vq2U8r_gG_a3L162woP6j-ZyB6PMjwIwm_v8cDaosiLitFhbcdHjQDnpQLog$ | LinkedIn | Twitter | Instagram | Facebook | YouTube
Internal Use - Confidential
-----Original Message-----
From: TechNet <[log in to unmask]> On Behalf Of Hernandez, Victor G
Sent: Monday, December 11, 2023 11:25
To: [log in to unmask]
Subject: [External] [TN] IPC STD 7351
Fellow TechNetters.
Is it a guideline/requirement for a PWB to have white Silk Screen component ID.
Victor,
Internal Use - Confidential
|
