Since there was so much discussion on the subject... and since you are all my good friends that help me in the DC email forum. I have created a spreadsheet that helps calculate the land diameters, connect and dis-connect feature sizes. I took these numbers from the IPC-275. You'll see on the Excel spreadsheet where you need to change your fabrication tolerances to change the numbers in the sheet. If anyone sees an error, or would like to comment, please do so. Karl Bates --------------------------------------------------------------------------------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To set a vacation stop for delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------