Help making footprint?

Richard Herman Inscribed thus:

Op Tue, 10 Apr 2012 19:45:42 +0200 schreef Don French

<noreply-101094@element14.com>:

 

>> I am making my first footprint in Eagle.  I am basing it on this

>> datasheet

>>

http://www.memoryprotectiondevices.com/datasheets/BH800S-datasheet.pdf

>> and the problem I am having is with the pads.  The drill diagram at

>> the top of the sheet shows a .042 drill but when I enter that into

>> Drill on the Info screen for the pad and choose Auto for the

>> diameter, it draws a pad that is much smaller than what it seems it

>> should be from the diagram on the lower right.

 

Then don't enter 'auto' but simply give the pad the diameter you want.

There is no 'right' size here. Larger pads are easier to etch and give

better mechanical hold for the battery holder, but use more space on

the PCB. You have to decide on the correct compromise.

if you use auto, the DRC will decide on what size the pad will be.

Look at the 'restring' tab.

 

>> what does 2PL mean on the drill hole callout?

 

I assume they mean 2 PLaces, as in two pads/pins?

 

>> Next, I am confused about the three circles on the .750 diameter

>> circle

>> on the lower right diagram.  What are they and why is there no

>> position or size information associated with them?

 

Since they are drawn in blue, they are most likely part of the holder,

I'm guessing just plastic standoffs, as you can see in the center

diagram.

 

  Finally, the center diagram

>> shows a locking stake (again with the 2PL notation) but without any

>> location or size  information. Any ideas on that?

 

Aren't those just the pins on the device shown from a different angle?

 

 

 

Richard

They are retainers to stop the part falling off the board.

--

Best Regards:

                     Baron.

Richard Herman Inscribed thus:

Op Tue, 10 Apr 2012 19:45:42 +0200 schreef Don French

<noreply-101094@element14.com>:

 

>> I am making my first footprint in Eagle.  I am basing it on this

>> datasheet

>>

http://www.memoryprotectiondevices.com/datasheets/BH800S-datasheet.pdf

>> and the problem I am having is with the pads.  The drill diagram at

>> the top of the sheet shows a .042 drill but when I enter that into

>> Drill on the Info screen for the pad and choose Auto for the

>> diameter, it draws a pad that is much smaller than what it seems it

>> should be from the diagram on the lower right.

 

Then don't enter 'auto' but simply give the pad the diameter you want.

There is no 'right' size here. Larger pads are easier to etch and give

better mechanical hold for the battery holder, but use more space on

the PCB. You have to decide on the correct compromise.

if you use auto, the DRC will decide on what size the pad will be.

Look at the 'restring' tab.

 

>> what does 2PL mean on the drill hole callout?

 

I assume they mean 2 PLaces, as in two pads/pins?

 

>> Next, I am confused about the three circles on the .750 diameter

>> circle

>> on the lower right diagram.  What are they and why is there no

>> position or size information associated with them?

 

Since they are drawn in blue, they are most likely part of the holder,

I'm guessing just plastic standoffs, as you can see in the center

diagram.

 

  Finally, the center diagram

>> shows a locking stake (again with the 2PL notation) but without any

>> location or size  information. Any ideas on that?

 

Aren't those just the pins on the device shown from a different angle?

 

 

 

Richard

They are retainers to stop the part falling off the board.

--

Best Regards:

                     Baron.