Well, if those autos happen to have diesel engines in them, then hundreds of diesels can be used in a Detroit car train. Seriously, I don't know about Detroit because it pretty flat country, but here in the West U.S. with steep mountains, 6 engines is not uncommon (4 in front and 2 in back), nor are (more than) kilometer long trains (in the flat valleys of course). Ryan -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Ingemar Hernefjord (KC/EMW) Sent: Wednesday, February 09, 2005 7:47 AM To: [log in to unmask] Subject: Re: [TN] limits for plant vibration Fine! I just have to get into the discussion another way. We have some train enthusiasts here (build models). One day there was a great discussion that was heard a long distance. How many diesel engines can be used in a Detroit car train? One said maximum two. Another four. On top of that, one guy said he had personally seen 6 engines pulling a one kilometer long train that moved not faster than you jog. Who was right? Ingemar Hernefjord Ericsson Microwave Systems -----Original Message----- From: TechNet [mailto:[log in to unmask]] Sent: den 9 februari 2005 15:32 To: [log in to unmask] Subject: Re: [TN] limits for plant vibration Roger, I say from experience that if you're doing any wetting balance testing, even the slightest vibration can be a problem. We had a wetting balance unit in a second floor lab, and the unit was extremely sensitive to transmitted vibration. When we were doing these tests we had to work around break times and meal times at the cafeteria as the unit easily detected the pitter-patter of fast food feet. We also had similar problems with the microscopes at or above 500X. Rearranging the lab to put those benches along supported interior walls and posts made a big improvement. I have a great appreciation for railroad rumbles. Many moons ago I used to live on the 2nd. floor of an ancient wooden building about 50-75m from the tracks. When those big freight trains loaded with new cars and trucks from the Ford plant went by, I was sure that me and my waterbed were headed for the basement. Bruce Tostevin Benchmark Electronics Hudson, NH -----Original Message----- From: Roger Mack [mailto:[log in to unmask]] Sent: Tuesday, February 08, 2005 1:18 PM To: [log in to unmask] Subject: [TN] limits for plant vibration We are considering sites for a new plant. One of the candidates is about 100m from a railway line. It is the mainline across the country and has very high traffic. We have recieved a vibration study of the property but are not sure how much impact this will have on production processes. Is there any level of vibration that is known to affect smt processes ,through hole, wave soldering, microscope use? peak particle velocities were measured at 0.045 in/sec , and 0.005in/sec background vibration levels. I have a table that indicates >0.01 as slightly perceptible to humans , >0.025 distinctly perceptible to humans. Any experiences or input would be appreciated, we don't usually have to worry about these things on the prairies. --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------