Library Pad Grows when p laced on Board?

Am 23.04.2016 um 10:21 schrieb Rob Pearce:

you still want larger values in DRC to override it.

No, not at all. A check is a check is a check and should not modify the

board. I want the DRC to issue warnings. Then, I'm free to approve these

warnings or rework the part definition in the library.

I imagine a world where we have a second set of rules which get applied

on auto parameters, and on auto parameters only.

That's at least what I want (and probably never get).

Rene

Am 23.04.2016 um 10:21 schrieb Rob Pearce:

you still want larger values in DRC to override it.

No, not at all. A check is a check is a check and should not modify the

board. I want the DRC to issue warnings. Then, I'm free to approve these

warnings or rework the part definition in the library.

I imagine a world where we have a second set of rules which get applied

on auto parameters, and on auto parameters only.

That's at least what I want (and probably never get).

Rene

On 23/04/16 09:08, Martin Rowe wrote:

Hi Rob,

 

Thank you for the detailed explanation. And yes, I understand the

usefulness of "parametric" design.

However, shouldn't that be enabled only on the "auto" value in library pad

diameter?

If I wanted a pad diameter of "X" (for whatever misguided reason!) by

defining it in the library, I would have expected to get a pad diameter of

"X"?

 

The most likely reason to specify a pad diameter in the library would be

to specify a minimum restring for this component - or even a particular

pad which has either strange-shaped pin or a current requirement -

without forcing the DRC settings for the rest of the board. As that's a

minimum requirement, you still want larger values in DRC to override it.

Hi Rob,

Thank you for the detailed explanation. And yes, I understand the

usefulness of "parametric" design.

However, shouldn't that be enabled only on the "auto" value in library pad

diameter?

If I wanted a pad diameter of "X" (for whatever misguided reason!) by

defining it in the library, I would have expected to get a pad diameter of

"X"?

Not that it matters, you have all helped me understand what I am seeing,

and I can now work around these "features"

Many thanks, Martin

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

Hi Rob,

Thank you for the detailed explanation. And yes, I understand the

usefulness of "parametric" design.

However, shouldn't that be enabled only on the "auto" value in library pad

diameter?

If I wanted a pad diameter of "X" (for whatever misguided reason!) by

defining it in the library, I would have expected to get a pad diameter of

"X"?

Not that it matters, you have all helped me understand what I am seeing,

and I can now work around these "features"

Many thanks, Martin

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

Hi Rob,

Thank you for the detailed explanation. And yes, I understand the

usefulness of "parametric" design.

However, shouldn't that be enabled only on the "auto" value in library pad

diameter?

If I wanted a pad diameter of "X" (for whatever misguided reason!) by

defining it in the library, I would have expected to get a pad diameter of

"X"?

Not that it matters, you have all helped me understand what I am seeing,

and I can now work around these "features"

Many thanks, Martin

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

On 22/04/16 21:19, Martin Rowe wrote:

Can't quite grasp the objective or reasoning behind it yet, but maybe it'll

come as I play?

Suppose I have a component - perhaps a DIL IC - which I'm using on a

number of designs. Most of these are professionally produced PCBs where

production tolerances are very good. I only need small currents here so

it's convenient to use 12 thou tracks and similar restrings. This means

I can route tracks between pins for more efficient layout.

Now I want to use that same component on a board that I'm etching at

home. Now I'm quite good at home etching so I'll happily use 16 thou

tracks, but my drilling isn't so great. The restring needs to be at

least 20 thou here.

I'm also using it on a board to be etched by 14-year-old students.

They're a lot worse than I am. For them I need at least 24 thou restring.

Because of the way Eagle works, I can use the same library for all three

projects, and just change the DRC settings.

HTH,

Rob

On 22/04/16 21:19, Martin Rowe wrote:

Can't quite grasp the objective or reasoning behind it yet, but maybe it'll

come as I play?

Suppose I have a component - perhaps a DIL IC - which I'm using on a

number of designs. Most of these are professionally produced PCBs where

production tolerances are very good. I only need small currents here so

it's convenient to use 12 thou tracks and similar restrings. This means

I can route tracks between pins for more efficient layout.

Now I want to use that same component on a board that I'm etching at

home. Now I'm quite good at home etching so I'll happily use 16 thou

tracks, but my drilling isn't so great. The restring needs to be at

least 20 thou here.

I'm also using it on a board to be etched by 14-year-old students.

They're a lot worse than I am. For them I need at least 24 thou restring.

Because of the way Eagle works, I can use the same library for all three

projects, and just change the DRC settings.

HTH,

Rob

On 22/04/16 21:19, Martin Rowe wrote:

Can't quite grasp the objective or reasoning behind it yet, but maybe it'll

come as I play?

Suppose I have a component - perhaps a DIL IC - which I'm using on a

number of designs. Most of these are professionally produced PCBs where

production tolerances are very good. I only need small currents here so

it's convenient to use 12 thou tracks and similar restrings. This means

I can route tracks between pins for more efficient layout.

Now I want to use that same component on a board that I'm etching at

home. Now I'm quite good at home etching so I'll happily use 16 thou

tracks, but my drilling isn't so great. The restring needs to be at

least 20 thou here.

I'm also using it on a board to be etched by 14-year-old students.

They're a lot worse than I am. For them I need at least 24 thou restring.

Because of the way Eagle works, I can use the same library for all three

projects, and just change the DRC settings.

HTH,

Rob

Ahhhhh.... Now, I see!! Or at least I think I do?

Can't quite grasp the objective or reasoning behind it yet, but maybe it'll

come as I play?

Thank you all, particularly Warren for the link to the FAQs.

Regards, Martin

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.