Hello,,, Mid is the "geometric center of the spans of all of the pins in a component.. (not the body outline.) Ref is the origin of the component when the component was created in the library.. Pad is Pad1 of the component...
Most of the time the component is and I believe should be built with the origin (Ref) at the center of PIN 1 so that when placement is performed you have the best chance to align all or the most number of pins to a testable /routing grid.. Since Protel does such a great job of calculating the centroid for the mid of the component anyway. Secretly the object of the game is to get as many pins as possible on an even increment of the routing grid. Which should be an even increment of the placement and tester grid.. Most Assembly houses want the centroid.. which Protel considers to be the Mid.. for surfacemount components... However they want pin1 for axials etc. You can easily provide that by providing the PIK file.. The X,Y coordinates are based from where the origin of the workspace is defined at the time in which you generate the PIK file.. so if you move the origin (set) it to a fiducial or tooling hole prior to generating the PIK file then all coordinates (X,Y) will emanate from that point.. Also doubly cool from a manufacturing perspective... Rotation is based upon the orientation of the component outline at the time it was originally created in the library.. meaning.. if one DIP16 was created in the vertical that would be considered "0" rotation.. if another DIP20 was created in the horizontal in the library it too would be considered "0" also , so when both are place in a workspace or database.. so that they looked vertical .. one would have an rotation of "0" and the other "90".. due to their different orientation at the time of their respective creations. Hope this helps... Sam * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
