How to delete redundent EAGLE airwires?

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Hallo all experts,

I have problem with FEMALE SMB CONNECTOR. It has four ground pins, but I just want to connect one pin instead four of them. How could I remove the remaining annoying airwire. In addition, I make use two such connectors, EAGLE connects all the grounds of these connectors together. How could seperate them?

Thanks a bunch in advance,

win2s

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mission impossible?

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win2suse:
I have problem with FEMALE SMB CONNECTOR. It has four ground pins, but I just want to connect one pin instead four of them.

Greetings win2s,

Did you create this library part? If so, delete the pins that you don’t plan to use. If you have found this part from another author (or CADSOFT.de), clone it and make it yours (remove unused pins). Why not connect all four ground pins together to your ground?

win2suse:
I make use two such connectors, EAGLE connects all the grounds of these connectors together. How could seperate them?

Go back to your schematic and create a second net for the pins your wish to isolate from the exisiting net (presummably called GND or GROUND). Try GND2 instead for your second net. Why would you separate the grounds? They could be connected together by external cables or equipment. This will short together your separated ground nets, possibly causing ground loops or uncontrolled ground current flow.

Comments Welcome!

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maybe it’s a dumb question, but why do you care if the other 3 pins connect?

If it’s a routing issue (can’t get there from here, for example), just live with the airwires.

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Hallo Bigglez and Philba,

thank you for your prompt replies.

why do you care if the other 3 pins connect?

A: The room accommodating my pcb is limited, and the PCB is full of elements and the width of the chosen path is too large. As a result there is no enough space left for connecting all of them on one layer.

Why would you separate the grounds? They could be connected together by external cables or equipment. This will short together your separated ground nets, possibly causing ground loops or uncontrolled ground current flow.

A: The two signals come from two thermopiles, and they are observed seperately. It is my understanding that if their grounds are connected and one of them is shorted, the potential of the other could be raised. For safety, I’m told to seperate the groud.

any correction is welcome;)

win2