Steven, after a very short considering your words: a air pressure dispenser it will be. Was in a hurry, will meet the robotic guys tomorrow. Need the machine next week (working!) Thanks again, Trikeman, on the wings again soon? Inge ----- Original Message ----- From: "Steven Creswick" <[log in to unmask]> To: <[log in to unmask]> Sent: Monday, February 09, 2009 10:18 PM Subject: Re: [TN] robotic dispensing > Ingemar, > > In my mind the decision for air vs screw [air time-pressure vs positive > displacement] is made on the basis of just how much volumetric control you > require [and the characteristics of the material]. > > If the RT time vs viscosity characteristics of the material allow you to > go > with a simple time/pressure arrangement, then all you need to hang on the > end of your robot arm is a syringe and needle. Cleanup is a snap. > > I hate cleaning the screw/auger systems!!! Things get even more > complicated > with short pot-life materials. > > It always seems like someone in production 'forgets' to clean the system > before leaving for the weekend ... leading to cost and delay issues the > following Monday. > > I would certainly try an experiment with time vs pressure first. If that > doesn't work, well there are other positive displacement systems that are > less cumbersome than the screws. Asymtek and others for example [$] > > Did I say that I like the old time vs pressure approach if I can get away > with it?? :-) > > Best wishes > > Steve > > > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge > Sent: Monday, February 09, 2009 3:54 PM > To: [log in to unmask] > Subject: [TN] robotic dispensing > > Hi all, > have to buy or lease a 6axis robot for dispensing UV cured conductive > epoxy > in thousands of small tubes or channels. Strings 0.5 mm wide and 20 mm > long. > > Only the dispenser tip can enter, the rest of the dispenser must stay > outside the target. Speed is of no interest, quality the more. It's a very > small one, only 500 pounds of weight and max payload 10 pounds. All DC > motors, no hydraulics. Position accuracy is 50 micrometers. > Q: anyone with opinion what is best, pressurized air piston or screw? Are > there dispensers for easy robotic hand mount? > Inge > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 15.0 > 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 15.0 > 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 15.0 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 -----------------------------------------------------