cant specify drill to pad clearance

On 9/30/2016 7:46 AM, Morten Leikvoll wrote:

My layout allows smds overlapping the rest-ring on vias, but I don't

want any drill inside (or near) smds.

 

In DRC, I set smd-via for same signals to 0, but this also seems to

allow drills in the middle of a smd wich is normally bad (*). I think

this behaviour should change or improve. In the future, maybe a checkbox

to select if this clearance is measured from the drill perimeter or the

via/pad perimeter.

Hi Morten,

I guess the issue here is that any check that is set to 0 becomes

disabled, that's why it allows the drill running through it.

One thing you could try is setting it to a really small value, that way

the check is still active but the clearance value is insignificant.

Try setting it to .01 mils or something like that. Is that better?

Let me know if there's anything else I can do for you.

Best Regards,

Jorge Garcia

On 30.09.2016 18:17, Jorge Garcia wrote:

On 9/30/2016 7:46 AM, Morten Leikvoll wrote:

My layout allows smds overlapping the rest-ring on vias, but I don't

want any drill inside (or near) smds.

 

In DRC, I set smd-via for same signals to 0, but this also seems to

allow drills in the middle of a smd wich is normally bad (*). I think

this behaviour should change or improve. In the future, maybe a checkbox

to select if this clearance is measured from the drill perimeter or the

via/pad perimeter.

 

Hi Morten,

 

I guess the issue here is that any check that is set to 0 becomes

disabled, that's why it allows the drill running through it.

 

One thing you could try is setting it to a really small value, that way

the check is still active but the clearance value is insignificant.

 

Try setting it to .01 mils or something like that. Is that better?

 

Let me know if there's anything else I can do for you.

 

Best Regards,

Jorge Garcia

I assume if I set it to a very small value, the restrings will not be

allowed to overlap the pad either? I want the drill away from smds, not

the restring..

 

I assume if I set it to a very small value, the restrings will not be

allowed to overlap the pad either? I want the drill away from smds, not

the restring..

 

 

Hi Morten,

You would have to try it to be sure but I don't think it would be a

problem. I think the rest-ring would be able to overlap the smd.

Give it a shot and let me know.

Best Regards,

Jorge Garcia

 

I assume if I set it to a very small value, the restrings will not be

allowed to overlap the pad either? I want the drill away from smds, not

the restring..

 

 

Hi Morten,

You would have to try it to be sure but I don't think it would be a

problem. I think the rest-ring would be able to overlap the smd.

Give it a shot and let me know.

Best Regards,

Jorge Garcia

On 03.10.2016 17:46, Jorge Garcia wrote:

 

I assume if I set it to a very small value, the restrings will not be

allowed to overlap the pad either? I want the drill away from smds, not

the restring..

 

 

 

Hi Morten,

 

You would have to try it to be sure but I don't think it would be a

problem. I think the rest-ring would be able to overlap the smd.

 

Give it a shot and let me know.

 

Best Regards,

Jorge Garcia

It IS a problem. See attached result of using 1mil same signal smd-via

clearance. The smd can't even get close to the via.

I hope you understand what I mean by drill-smd clearance vs via-smd.

Attachments:

On 4/10/2016 7:48 p.m., Morten Leikvoll wrote:

On 03.10.2016 17:46, Jorge Garcia wrote:

 

I assume if I set it to a very small value, the restrings will not be

allowed to overlap the pad either? I want the drill away from smds, not

the restring..

 

 

 

Hi Morten,

 

You would have to try it to be sure but I don't think it would be a

problem. I think the rest-ring would be able to overlap the smd.

 

Give it a shot and let me know.

 

Best Regards,

Jorge Garcia

 

It IS a problem. See attached result of using 1mil same signal smd-via

clearance. The smd can't even get close to the via.

I hope you understand what I mean by drill-smd clearance vs via-smd.

 

 

Greetings, I wish to comment.

I agree it cannot be done. Even at the smallest clearance above zero it

is the SMD and via that must keep away from each other otherwise the DRC

throws an error

This is another on a list of issues that Cadsoft should to address for

Eagle to remain relevant.

Eagle has not kept up with abilities demanded with the reduction of

geometries of components and PCB. Created in the time of DIL14 ICs,

Eagle was able force a number of guiding rules on the user but those

restrictions now cause problems.

So Morten's request needs to happen if you expect to be able to deal

with the reducing size of components. The SMD and via should be able to

overlap and the test should be that the hole keeps away from the SMD shape.

The other similar missing feature inhibiting reducing geometries is the

ability to specify a hole on the PCB without the copper being pulled

back from the edge. That is, without making the

DRC>Distance>Copper/Dimension =0 as you loose some desirable automatic

features with polygons if you do.

Regards

Warren

The other similar missing feature inhibiting reducing geometries is the

ability to specify a hole on the PCB without the copper being pulled

back from the edge. That is, without making the

DRC>Distance>Copper/Dimension =0 as you loose some desirable automatic

features with polygons if you do.

 

Regards

Warren

@Morten,

I've put in an enhancement request for this.

@warren

Could you give a use case for this suggestion? This is the first I hear

of this. Board houses do have limits to how close copper can be to a

milling operation in the board, overriding it sounds dangerous to me.

Let me know if there's anything else I can do for you.

Best Regards,

Jorge Garcia