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T O P I C    R E V I E W
AndyB Posted - 06 Jul 2011 : 21:54:13
I have joined a component pad with a pad on the bottom layer joined together with via's. These are all on the same net but I am still getting this error.
Pad to Pad error (P-P) at (-38.64 0.17) on layer "[Bottom]".
Error between Pad (Net 'N0001') and Component Pad LED4.3, Gap is 0.00 needs to be 0.10.

Has not been a problem before but this board is !
6   L A T E S T    R E P L I E S    (Newest First)
AndyB Posted - 11 Jul 2011 : 23:08:01
I have a number of via's joining the top and bottom pads for heat transfer.
The components are LED's and mounted on FR4.
Peter Johnson Posted - 11 Jul 2011 : 18:28:27
As a matter of interest, why use two pads and a via?

Why not just use one pad with the same sizes in the style as the via, but with exceptions added to the top and bottom copper layers to create the different sized pads?
AndyB Posted - 09 Jul 2011 : 23:51:07
Looks like its my error. There seems to be identical pads on the bottom layer that are the same as the components bottom pad. Not to sure how they got there but will asume it was my error.
Sorry guys!
AndyB Posted - 07 Jul 2011 : 10:15:54
Yes all on the same Net.
I have made 30 + boards using the same method this one seems to be a problem.
Its picked up on every component laid out this way.
The error only points to [Bottom] or Bottom Copper.
al1234 Posted - 07 Jul 2011 : 09:50:47
I've had exactly the same error.
with reference to the help file, CM-CM errors:
quote:
Checking between components is done using what the application determines is the component 'body'. By default this uses the enclosing box round all shapes and pads on the same side of the board as the component, and the enclosing box round the pads on the other side (for through-hole components).

In my case the enclosing box it used for a through hole was too large and I got the error at the closest point to an SM device on the other side of the board.
I couldn't remove the error so I ignored it and went to manufacture!
I like to remove all errors so any help with this one would be appreciated. The problem has only appeared (?) since the last update.
Iain Wilkie Posted - 07 Jul 2011 : 09:17:15
Are you sure they are all on the same net ??? ... including the actual vias (each and every one)

Iain