Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


stencil ordering

Tony

#22150

stencil ordering | 25 October, 2002

This may sound like a stupid question but keep in mind I am very new at this and most of the training I have recieved has been from operation manuals and this forum (thanks to all).

Our purchasing agent (new hire) is ordering a stencil for the first time and is asking me questions I don't understand. The company she is ordering from faxed a pic of the new stencil and is asking which edge should be the leading edge..... would that be the edge to the right when facing the printer????? Does this make much difference when the the board (a 2x6 panel) is just about square???? When someone talks about a 20x20 or 29x29 is that the demensions of the stencil? Just one more.... I have always heard of the stencils I use called "Fuji4000", used in a DEK 288, is that the correct technical name?

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RDR

#22154

stencil ordering | 25 October, 2002

Leading edge, This is used to determine the orientation of the board as you want to run it. If you use center justified stencils this is usually not an issue since you can just turn the stencil any which way you want to. If you are using front/rear justified this becomes important.

20x20,29x29, etc... are the frame dimensions of the stencil, this size is dictated by your screen printer.

As far as "Fuji 4000 used in a dek 288" These are both screen printers and it sounds like you can use a stencil from a Fuji 4000 in the DEK 288. I am not sure what you mean by "correct technical name"

Russ

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#22155

stencil ordering | 25 October, 2002

Nor ment as a criticism of anyone, but you really need to become intimate with your stencil supplier. This is not one of those "throw it over the wall" buying relationships, like you can have with buying pencils. View this an opportunity to develop a partner at your supplier. It's OK to call the supplier and talk through this with them They will probably view this reeeealy positively.

Now that we have all had this "feel good moment", lets all join hands and sing "kumbaya".

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RDR

#22156

stencil ordering | 25 October, 2002

Kumbaya my lord, Kumbaya,

I agree with Dave.

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Tony

#22157

stencil ordering | 25 October, 2002

Russ, that makes sense, thanks. As for the 20x20... I was speaking with a sales rep who was trying to talk me into buying stencils from him. I told him I use "Fuji 4000" and he sent me quotes for 20x20 and 29x29. That seems odd since the Fuji 4000 stencils I use now are quite a bit bigger than that. I must be missing something there.

Dave, I will certainly take your advice and contact our rep at IIT and get a good relationship with him. The guy who ran the SMT before I got here didn't say much about ordering stencils other than here is the web site address to order. I didn't want to look like an idiot by calling and saying "I have no clue what I'm doing", but I guess thats better than flushing $200 - $300 down the pot by ordering the wrong thing....

Thanks again for all the help, I'm sure I'll be asking more in the comming months. I sure am gratefull to this forum.

PS .......Kumbaya......

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#22158

stencil ordering | 26 October, 2002

IIT is a reputable supplier. They will be more than happy, happy to help a newbie get a good product.

Continuing, at one level of product design sophistication ordering by remote will provide you with a perfectly acceptable stencil. But on the other side it seems like every design has peculiarities. And as you become more aware of those things and want to try prevent those things from causing you problems in production, attention to stencil design may be one answer for you. Your supplier can give you advice.

See here's the wierd part, your stencil supplier has learned how to troubleshoot stencil designs by correctioning designs that supplier's other customers did not anticipate a problems well. It's to your benefit to captalize on that knowledge. It saves you work. Gives you more time to eat Krispy Kreams. Yumm.

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Darby

#22233

stencil ordering | 1 November, 2002

Ive always preferred "Put another log on the fire" for those emotional moments. Why don't you tell a couple of these purveyors of print that you haven't got a clue. See who is the most helpful in giving you some time and knowledge so that you then have a clue. This will ultimately make life easier for both of you. "Cook me up some bacon and some peas" Darby

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