Hi Bill, here are your answers:
- All the steps are presently on the squeegee side
- Aperture size of the component closest to the 6/5 : 27 X 27 mils (square aperture)on the 6 mils area
- Aperture size of the component closest to the 8/6: 25 X 25 mils round on the 8 mils area
Thanks
Dominic
> Date: Thu, 10 Nov 2011 12:40:19 -0600
> From: [log in to unmask]
> Subject: Re: [TN] Step Stencils design
> To: [log in to unmask]
>
> 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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