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November 2011

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Subject:
From:
Bill Coleman <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Bill Coleman <[log in to unmask]>
Date:
Thu, 10 Nov 2011 12:40:19 -0600
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Hi Dominic

I have a couple of questions before recommendations.

Is step on squeegee side or contact side in reference to your comment step-down vs step-up
Aperture size of the component closest to the 6/5 step and the 8/6 step

Regards,

Bill

 
William E. Coleman Ph.D.
Vice President Technology
Photo Stencil
4725 Centennial Blvd.
Colorado Springs, CO 80919
Office:     719-535-8528
Cell:         719-331-2433
Fax:         719-599-4334


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dominic Boudreau
Sent: Thursday, November 10, 2011 10:57 AM
To: [log in to unmask]
Subject: [TN] Step Stencils design

Hello Technetters, I would like to request your help regarding step stencils; I never worked before with these of stencil so all recommendations would be really appreciated.  We have a step-up stencil that has 3 thicknesses: 8, 6 and 5 mils. Most of the stencil is at 6 mils and there are some areas that are at 8 and at 5 mils. The problem that we have is that the paste thickness that we obtain on the  5 and 6 mils areas is around  8 mils... The stencil has step-down from 8 to 6 mils and from 6 to 5 mils . Here are my questions:
 
1) Which keep-out out distance we should have. is the rule of thumb of IPC-7525  correct ( 35 mils for each 1 mil step thickness)?.
2) Which type of stencil is recommended , electroform?
3) Do we need a special type of squeegee blades?
4) Presently we use step-up stencil, should we use step-down stencil?
 
Thank you
 Dominic Boudreau  		 	   		  

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