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Preferences question - Terminal SM oversize

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jnshah View Drop Down
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    Posted: 20 Apr 2018 at 12:11pm
Hi,

If I change the preferences for Soldermask oversize (for e.g. outward L terminal), it seems to be rounding up the Y oversize to a single precision. For example, if I specify 0.07mm, The result for a pad that is 0.30 in copper ends up being 0.50 for soldermask and not 0.44. The X dimension works correctly and does not round up.

This is with 2018-04 Pre-release.

I will appreciate an explanation.

Thank you.
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Jeff.M View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jeff.M Quote  Post ReplyReply Direct Link To This Post Posted: 20 Apr 2018 at 6:44pm
Please provide a specific example that we can use to look into your report.
Thanks.
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jnshah View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jnshah Quote  Post ReplyReply Direct Link To This Post Posted: 21 Apr 2018 at 6:00am
Hi Jeff,
Here is one FPX file with a part where this happens. After your question, I have found that it does not happen with every part. 




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Post Options Post Options   Thanks (0) Thanks(0)   Quote jnshah Quote  Post ReplyReply Direct Link To This Post Posted: 21 Apr 2018 at 6:02am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jeff.M Quote  Post ReplyReply Direct Link To This Post Posted: 24 Apr 2018 at 9:08am
There's a Rule preference option called 'Minimum Gang Solder Mask Web'.
What happens when the spacing between adjacent pad solder masks falls below that value, solder mask automatically expands to reduce the web to zero -'ganging' the masks together. It appears that's happening to your part. Change the rule 0.01, for example, and watch what happens.
Jeff
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jnshah Quote  Post ReplyReply Direct Link To This Post Posted: 26 Apr 2018 at 6:59am
Thank you. Yes, that is it.

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