Bruce.
I ran 4792's when I was at Hadco/Sanmina. we cleaned our nozzles with IPA in a dish and placed the dish into a Branson ultrasonic bath, we then blew dry the nozzles and wiped them down with a lint free cloth. The IPA can leave a film on the nozzle that can lead the nozzle to stick. Also we would clean the bores in the heads with a cotton or foam swab, 1st with IPA and then a dry one. I found that over time grease from the turret could work its way (after many cycles) into the heads and gunk up the nozzle bores. We also kept one complete set of nozzles ready to go, this help to decrease the downtime. How old are your nozzles. even though they are made to last they can get worn enough to cause nozzle down errors but look fine to the eye.
If you have any other HSP questions, feel free to contact me off line.
Royce
***********************************************************************
Royce Taylor
Process Engineering
Suntron Corporation NEO
104 Glenn Street
Lawrence, MA 01843
(978) 747-2061 voice
(978) 747-2010 fax
[log in to unmask]
www.suntroncorp.com
-----Original Message-----
From: Tostevin, Bruce [mailto:[log in to unmask]]
Sent: Wednesday, January 29, 2003 9:16 AM
To: [log in to unmask]
Subject: [TN] sticking nozzles on Universal 4791
A manufacturing engineer here has asked if anyone has experience with sticking nozzles on Universal 4791 (Sanyo TCM 1600) chipshooters. Typically, the problem occurs after one or two weeks of continuous operation. The nozzles hang, and will not drop in time when the machine is running at full speed. Once the nozzles are removed and cleaned (wiped down with IPA on a clean cloth), the problem goes away for another one or two weeks.
While the one or two week P.M. is not unreasonable, there are machines running high volumes where this happens every 3 - 4 days, and this is a problem. Ultimately, the machine bypasses the stuck nozzle and runs at reduced speed.
Questions:
1. Is this a common experience with these machines?
2. Does anyone have better results with a different cleaning method?
3. Has anyone tried a thin film lubricant, such as wiping with a silicon - impregnated cloth? (We can think of lots of objections to this.)
4. Is there any benefit to changing out a nozzle after a certain number of estimated cycles of operation to prevent future sticking problems?
Any input is much appreciated.
Bruce Tostevin
Benchmark Electronics
Hudson, NH
---------------------------------------------------
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
-----------------------------------------------------
|
