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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