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 Post subject: How to make holes in SMT stencil for positioning pins ?
PostPosted: 18 Nov 2014, 12:21 
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Joined: 17 Oct 2014, 09:55
Posts: 4
I’d like to order OSH stencils with holes for adjustment pins according this http://eurocircuits.com/ec-registration-system specification.

It want to use them on a low-cost printer called ec-stencil-fix -> https://www.youtube.com/watch?v=HBWtqZro_fg

It needs on the stencil two 5mm (5H8 tolerance = 5mm minus 0 micrometers and max. plus 18 micrometers) holes

outside the board outline, means in the border zone, as they call at at OSH.

How can I put the holes onto the Top Paste gerber layer so I get exactly 5mm holes ?

I thought about adding fake SMT pins on Layer "Top" outside the board outline, but aren't these also subject to paste mask shrink ?

Or is there a way to get mounting holes an Top Paste Layer ? I can put shapes there like a circle, but this probably will not produce a hole

in the stencil.

Attachment:
pinhole.png


Peter


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 Post subject: Re: How to make holes in SMT stencil for positioning pins ?
PostPosted: 19 Nov 2014, 09:44 
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Joined: 14 Jun 2010, 06:43
Posts: 2762
Instead mounting holes or pads, you can add circular shapes on top paste layer.


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 Post subject: Re: How to make holes in SMT stencil for positioning pins ?
PostPosted: 19 Nov 2014, 10:01 
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Joined: 17 Oct 2014, 09:55
Posts: 4
ok, when using a filled circular shape I get a round 5mm aperture at the right place.

And this shape is excluded from paste mask shrink calculations. I tried by setting a non-zero value

for shrink and the extra shape was not touched, it was still 5mm.

So I can confirm the solution - thanks a lot !

Peter


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 Post subject: Re: How to make holes in SMT stencil for positioning pins ?
PostPosted: 07 Apr 2017, 04:32 
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Joined: 01 Apr 2017, 02:09
Posts: 6
For example, the following figure. If you want to standardize the SMT template can be ordered from pcb manufacturers.

Example of position mark for SMT
Yellow: Mask layer
Blue: Copper layer
Red: Past layer


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