Lino. To answer Brian's question, the string is 8.3 cm long. Have it right here in front of me. Brian's listing of parameters is a good one for consideration. I suggest that you contact the National Physical Laboratory (NPL) in the UK. In the late 80s or early 90s, they did an extensive amount of research on what frequencies and power levels could be used for ultrasonic cleaning. I think it was done by Dr. Colin Lea or by Peter Foote. Dr. Chris Hunt or Alan Brewin may be able to guide you to the test reports generated. Those reports were used to convince some of the more stubborn military types that ultrasonic cleaning could be used safely. Try http://www.npl.co.uk/. Doug Pauls Advanced Operations Engineering Rockwell Collins Brian Ellis <b_ellis@PROTONIQ To: [log in to unmask] UE.COM> cc: Sent by: TechNet Subject: Re: [TN] Ultrasonics cleaning <[log in to unmask]> 11/12/02 07:24 AM Please respond to "TechNet E-Mail Forum."; Please respond to Brian Ellis Lino How long is a piece of string? U/S cleaning can be effective or it may be a simple waste of time and money or it may destroy some components. Take your pick. What is your cleaning medium? Is it degassed? Is it filtered or does it contain particulate matter? What is the type of transducer? What is the power input? What is the size of tank? What is the temperature? How far are the assemblies from the transducers? How are the assemblies oriented with respect to the transducers? What are you cleaning off from the assemblies? What is the smallest interstice from which you wish to remove contaminants? What are the dimensions and topography of the interstices? etc. Sorry! Brian LINO REBOREDO wrote: > Hi, > > i want to improve the cleaning process in my smt assembly line. Up to my > readings ULTRASONICs 40 Khz. sweep frecuency gives the very best results. > Is this as effecient as is resported.? > > regards > > Lino Reboredo > PCB Plant Eng > PCB ICID. > > > > > _________________________________________________________________ > Charla con tus amigos en línea mediante MSN Messenger: > http://messenger.microsoft.com/es > > --------------------------------------------------- > Technet Mail List provided as a free 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/html/forum.htm for additional > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 > ext.5315 > ----------------------------------------------------- > > > --------------------------------------------------- Technet Mail List provided as a free 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a free 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------