Making Printed Circuit Boards with Orcad Layout Part 6

The company I use gives me 8 drill sizes that are free, and charges about $9.00 for an extra drill size, so adjusting some of the holes will could save lots of money.

From the Drill Chart below there are 48 holes sizes 0.031" and  0.034".  I will shift them up to a size 0.035".

The 0.110" holes will become .125" and the 0.028" & 0.042" I'll leave alone.

One method of doing this is to modify the the footprints and replace the pads with different pads from the pad library.

	This is good if you want to create new footprints for parts that you want to use again in the future.
	One problem is that this is very time consuming.

The second way is to modify the padstack local library from the spreadsheet.

	Go to Tool -> Padstacks -> Select From Spreadsheet...
	Cancel the "Select Padstack" dialog box.
	The spreadsheet shows all 84 holes with all it's layers (even those that are unused).
	Scroll down the spreadsheet and locate the number 31or 34 (stands for 0.031",0.034") under the "Pad Width" & "Pad Height" column and the "DRLDWG" AND "DRILL" layers.

	In the pad above, double click on each of the "31"s and change them to "35"s
	Lastly make sure the TOP" and "BOTTOM" layers within the padstack are larger than 35.
	This one is 52, so we are okay.  This will the plating that is seen on the top and bottom of the board, around the hole.

Now let the Drill Chart update by going to Tool -> Drill Chart -> Properties, then press "OK".

If you got all the padstacks, then the unwanted sizes should vanish.

From the Drill Chart, the "SYM" or symbol column needs to have a unique symbol.

Go to Tool -> Drill Chart -> Select From Spread Sheet...

	Double click the number you want to change, and replace it with an unique number 1 - 20.
	There are 10 styles of symbols in two different sizes.  1-10 (Large) 11 - 20 (Small).  Large holes (0.125") I'll make a large symbol.

To see the symbols in action hide all layers except "Global Layer", "SST" & "DRD".  Hide the layer by selecting it from the pull down menu in the tool bar, and press "-" key.  Select the "DRD" layer last so the symbols are on top.