The '+' Polarity Symbol Dimensions

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   I have '+' polarity marker in Silkscreen and Assembly layers with same dimension as line width = 0.05 mm and size = 1.016 mm
However, when open in Altium Designer the '+' symbol has different dimension values.

Footprint Expert:

Altium Assembly:

Silkscreen:

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m.elsayed Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 22 Sep 2016 Status: Offline Points: 72	Post Options Post Reply Quote m.elsayed Report Post Thanks(0) Quote Reply Topic: The '+' Polarity Symbol Dimensions Posted: 14 Sep 2025 at 6:58am
	I have '+' polarity marker in Silkscreen and Assembly layers with same dimension as line width = 0.05 mm and size = 1.016 mm However, when open in Altium Designer the '+' symbol has different dimension values. Footprint Expert: Altium Assembly: Silkscreen:



tgrodnicki Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 30 Sep 2014 Status: Offline Points: 128	Post Options Post Reply Quote tgrodnicki Report Post Thanks(1) Quote Reply Posted: 14 Sep 2025 at 11:22pm
	Footprint Expert reports the length of the lines forming the cross as the maximum value. Most CAD programs do not account for round ends when reporting the length of the lines. If you subtract the width (0.050) from the length reported by Footprint Expert (1.016), you get the result reported by Altium Designer (0.966).

m.elsayed Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 22 Sep 2016 Status: Offline Points: 72	Post Options Post Reply Quote m.elsayed Report Post Thanks(0) Quote Reply Posted: 21 hours 12 minutes ago at 5:51am
	But also, I found in line width changed to 0.254 mm other layer assembly. However, I changed the line width to 0.05 mm.

Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5865	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 11 hours 38 minutes ago at 3:25pm
	I created a Silkscreen Plus + symbol in Footprint Expert 1.00 mm X 0.15 mm line width. Here is the Footprint Expert Symbol dialog box: I translated the footprint to Altium and here are the Plus Symbol dimensions. Here is the Altium Properties for the Polarity Marker: It seems to be working 100% correct. Can you confirm that the issue you reported is working correctly?
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m.elsayed Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 22 Sep 2016 Status: Offline Points: 72	Post Options Post Reply Quote m.elsayed Report Post Thanks(0) Quote Reply Posted: 43 minutes ago at 2:20am
	Thanks Tom, for your great support I have get your point in length, but for line width i notice below:- 1-Silkscreen however i have selected value line width =0.05 mm and select Apply & Done, a and then checked found it 0.15 mm (PCb tool) 2-Assembly however i select 0.05 mm in line width i found it in altium as 0.025 mm please can check and have explanation what happen and causes for this