I should have said that the nest has tooling PINS, not holes. Also, presses are made that can be tripped off once a certain programmed pressure is reached. I would advise talking to your Tyco rep. They are very knowledgeable and can provide a lot of information on the process. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D. Sent: Thursday, May 12, 2011 2:59 PM To: [log in to unmask] Subject: Re: [TN] Under Pressure Typically, the PWB is supported by a nest with holes drilled in it that accommodate the pins coming through the holes in the PWB. This prevents the PWB from any significant bending or warping. The nest has tooling holes to hold the PWB in place so the PWB connector holes are lined up with the holes in the nest. A second set (or sometimes the same pins) guide the ram, if necessary. Then, to prevent undue force on the PWB from the bottom of the connector body (or in this case from the bottom of the metal block), a shut height is used in the press to control the press ram from pushing the metal block down any further than is needed to seat the block. Some presses have the option of using either a mechanical shut height OR a programmable Z-axis point where the ram is tripped off. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson Sent: Thursday, May 12, 2011 2:38 PM To: [log in to unmask] Subject: [TN] Under Pressure We have a high power application where the engineers want to use press-fit components that are like metal blocks with a grid of pins underneath that need to be smooshed into the board. You can see a picture at http://frontdoor.biz/PCBportal/wurth.jpg The manufacturer gives enough data about insertion force and max torque and all that, but it just got me wondering... some of these devices have 36 pins and at 250 N per pin (max) this seems like a lot of pressure. Can boards be damaged by so much pressure? (assuming we prevent warping). Seems like there would have to be some limit to compressive force on laminate, but I've never heard anyone mention it. Jack ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. 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