[SOLVED] Can't change track clearance

[Cristian]

Hi all!

I have a project where I need to change the track clearance for some specific nets. Setting the clearance in a custom net class did not help. Please see below:

Can you please give any guidance?

Thanks

[mf_ibfeew]

• general clearance values in File–>board setup–>Design rules–>Constraint?
• are you sure the drawed track belongs to your new netclass? at least seems so if the small track C2-D1 is currently selected and the statusbar with netclass “A121” belongs to that net
• how is the netclass-setting (and therefore the clearance) for the other vias C1-D2? more specific: As these vias are connected to GND: which learance applies to GND-signals?

additional note: always add a small note which kicad version you use.
note2: the picture is not really self-explanatory. I assumed that you wanted to draw that small track and got clearance errors.

[Cristian]

1. Clearance on constraint is set to 0.05 which is the requested clearance;
2. A121 net class (class of the small track selected ) has a clearance of 0.05mm.
3. There are no vias. What you see is a footprint of a part that has really small tolerances and it is placed alone on the bottom side of the board alone on a solid ground plane.
   What I want to achieve is a full connection between C1 and GND plane. Same for D2.
   
   

[craftyjon]

What is your board minimum clearance? Netclass clearances cannot reduce the clearance below the minimum clearance, they can only increase the clearance from there.

Also, what is the clearance set for that copper zone (in its properties)?

[mf_ibfeew]

What I want to achieve is a full connection between C1 and GND plane

Than additional to my above mentioned things (board clearance constraint, GND netclass clearance) maybe you have to look into the zone settings of the GND plane.
Values for zone clearance and zone minimum width may important.

[Cristian]

Please see below:

[craftyjon]

Select that track and the zone and run Inspect > Clearance Resolution

[Cristian]

Please see below:

Why Default class appear there???

[mf_ibfeew]

I suspect GND belongs to netclass default → therefore a gap of 0,2mm between GND and your track. (edit: yes, your next picture shows it)

Why Default class appear there?

If you have two different netclasses the bigger value is taken.

[Cristian]

Yup that was it.

Thank you all!!

[Cristian]

Forgot about the GND…