Cut-able link/jumper part that does not logically short nets.

OK, searched for more on this. I don't think it is possible. Two alternative seam to be in common use. First design a part that shorts the two pads and then deal with the error. The second is use a 0R approach. I think for what I want to do I will use a tiny 0R part and just blob solder across it. I was hoping for something better. As I said, art working the short into another layer and then combining it on output would do, if I knew how to do this.

William Bagshaw wrote on Mon, 30 January 2017 12:53

OK, searched for more on this. I don't think it is possible. Two

alternative seam to be in common use. First design a part that shorts the

two pads and then deal with the error. The second is use a 0R approach. I

think for what I want to do I will use a tiny 0R part and just blob

solder across it. I was hoping for something better. As I said, art

working the short into another layer and then combining it on output

would do, if I knew how to do this.

Hi William,

You can absolutely do what you are wanting to do, I've done it many times.

Let's say you have a 2-layer board.  Set up the DRC->layers tab for 3

layers.  Then use the 3rd layer for your copper jumpers.  By using an

electrical layer the ratsnest tool will take these into account so you know

that all nets are routed. (If you use a non-electrical layer ratsnest won't

know about them).

Then, in the CAM processor, include the 3rd layer in the section where you

want it included (top or bottom gerber).  This will "OR" your jumper layer

into the layer in question.

IMPORTANT NOTICE :  With this method the PCB DRC tool won't catch any

unintentional shorts between the 3rd layer and the layer you merge it into!

So you can end up with unusable boards if copper overlaps in places you

don't intend.  The good thing is you can manually inspect the gerbers and

know if you have an issue or not.  But you have to be very careful.

Hope that helps.

Cheers,

James.

--

James Morrison  ~~~  Stratford Digital

http://www.stratforddigital.ca

--

EAGLE support forums at http://www.eaglecentral.ca :: Where the EAGLE community meets.

William Bagshaw wrote on Mon, 30 January 2017 12:53

OK, searched for more on this. I don't think it is possible. Two

alternative seam to be in common use. First design a part that shorts the

two pads and then deal with the error. The second is use a 0R approach. I

think for what I want to do I will use a tiny 0R part and just blob

solder across it. I was hoping for something better. As I said, art

working the short into another layer and then combining it on output

would do, if I knew how to do this.

Hi William,

You can absolutely do what you are wanting to do, I've done it many times.

Let's say you have a 2-layer board.  Set up the DRC->layers tab for 3

layers.  Then use the 3rd layer for your copper jumpers.  By using an

electrical layer the ratsnest tool will take these into account so you know

that all nets are routed. (If you use a non-electrical layer ratsnest won't

know about them).

Then, in the CAM processor, include the 3rd layer in the section where you

want it included (top or bottom gerber).  This will "OR" your jumper layer

into the layer in question.

IMPORTANT NOTICE :  With this method the PCB DRC tool won't catch any

unintentional shorts between the 3rd layer and the layer you merge it into!

So you can end up with unusable boards if copper overlaps in places you

don't intend.  The good thing is you can manually inspect the gerbers and

know if you have an issue or not.  But you have to be very careful.

Hope that helps.

Cheers,

James.

--

James Morrison  ~~~  Stratford Digital

http://www.stratforddigital.ca

--

EAGLE support forums at http://www.eaglecentral.ca :: Where the EAGLE community meets.