Preferences question - Terminal SM oversize

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   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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jnshah Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 21 Jan 2016 Status: Offline Points: 93	Post Options Post Reply Quote jnshah Report Post Thanks(0) Quote Reply Topic: Preferences question - Terminal SM oversize 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.



Jeff.M Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 16 May 2012 Location: San Diego Status: Offline Points: 481	Post Options Post Reply Quote Jeff.M Report Post Thanks(0) Quote Reply 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 Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 21 Jan 2016 Status: Offline Points: 93	Post Options Post Reply Quote jnshah Report Post Thanks(0) Quote Reply 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.

jnshah Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 21 Jan 2016 Status: Offline Points: 93	Post Options Post Reply Quote jnshah Report Post Thanks(0) Quote Reply Posted: 21 Apr 2018 at 6:02am
	Here is the file: uploads/11567/New_Parts_Copy_2018-04-21_06-02-22.fpx

Jeff.M Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 16 May 2012 Location: San Diego Status: Offline Points: 481	Post Options Post Reply Quote Jeff.M Report Post Thanks(0) Quote Reply 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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jnshah Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 21 Jan 2016 Status: Offline Points: 93	Post Options Post Reply Quote jnshah Report Post Thanks(0) Quote Reply Posted: 26 Apr 2018 at 6:59am
	Thank you. Yes, that is it.