Stephen C Joy wrote: > > Text item: External Message Header > > I would like to understand the current capability of pcb manufacturing with > respect to thermal relief. The 3 actions would be: > > 1. PB mfg places thermal relief patterns at "true" locations in the > aperture file. > True > > 2. thermal relief are created at PB mfg based on text notes in aperture > file. Text notes are complicated and must be associated with the correct > "hole" in the case of multiple thermal relief. > False. The thermal is flashed like any other pad. You specify what ID, OD, # and size of spokes in your aperture definition file, just like you would with any other flash. > > 3. Area fill thermal ties will default to narrowest trace unless a text > note in the aperture file is acted upon by PB mfg. > See above. > > Is this true? > How do you control multiple thermal patterns? > They are flashed, as long as the layout software can handle that. > > Is the thermal pattern still required? > For thru-hole parts, yes. > > Are there any rules for current vs no thermal relief? ..like hole size, > copper weight, etc. > I use IPC specs for internal layers. Or (shameless plug alert) the trace width calculator on my web site ( http://www.aracnet.com/~gpatrick ) (:-p > > Steve > -- /\ Praegitzer Design /\/\ A Division of Praegitzer Industries, Inc. /\/\/\ Portland Design Center /\/\/\/\ 7245 NW Evergreen Pkwy. #100 ---------- Hillsboro, OR 97124 George Patrick, Sr. PCB Designer Email: [log in to unmask] Voice: (503) 531-2050 ext. 1813 Fax: (503) 531-2051 ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################