We recently purchased an LSM (laser-section-microscope) from Cyber-optics,
and I have not yet had a chance to do a Gage R&R test. But, the previous
method we were using, an optical microscope with digital z-axis, reveales a
"horrible" gage R&R between operators. Everyone's vision "sees" things
differently, and of course which solder peak do you focus on?
The LSM does remove some of the quesswork for the operators, allowing them
to use the laser "stripe" to see more of an average across the printed
pattern, and we can auto-download the data for SPC purposes with the
LSM-Wizard software. It IS very important how it is processed...you want to
try for the same pad type/size being measured from ass'y to ass'y (0805
works well), and education on where the pad edge is, is VERY important.
From the amount of use we have had, the repeatability already seems to be
much better then the "scope" system ('course, the Gage R&R will reveal all).
All-in-all, we like the system!
(standard "non-affiliated"/non-promo/non-sales" disclaimer inserted here).
At 09:56 AM 2/12/98 PST, you wrote:
>I have seen the same poor results in the past on paste height measuring
>equipment. I would like to throw out a question again --
>
>Has anyone performed a gage R&R (reproducibility and repeatability) study on
>this type of equipment with acceptable results?
>
>
> ----------
>From: Krishna Kalyan
>To: TechNet
>Subject: Re: [TN] Assy: Solder Paste Height Measurement
>Date: Wednesday, February 11, 1998 4:33PM
>
> Hi everyone.
> My two cents worth on LSM. In a project, I found its repeatability
>was poor.
>
>krishna kalyan
>
>=====================================================================
>
>>Date: Tue, 10 Feb 1998 18:36:13 -0800
>>Reply-To: "TechNet E-Mail Forum." <[log in to unmask]>,
>> Ron Lohrbach <[log in to unmask]>
>>From: Ron Lohrbach <[log in to unmask]>
>>Subject: Re: [TN] Assy: Solder Paste Height Measurement
>>To: [log in to unmask]
>>
>>From: Mark Norris <[log in to unmask]>
>>Subject: Re: Measurement Query I thought of interest - Just FYI
>>Mime-Version: 1.0
>>
>>
>>A company called cyberoptic makes a real simple height mesuring device,
>its
>>called LSM (Laser Section Microscope). Used it probably costs 5,000.
>>
>>
>>-------
>>At 11:06 AM -0600 2/10/98, Charles Barker wrote:
>>>Charles Barker@I-O INC
>>>02/10/98 11:06 AM
>>>
>>>Some years ago, there was a mechanical system on the market for
>measuring
>>>the height of paste deposited on a pad. The system consisted of a
>small
>>>granite block, a needle attached to a Mititoyo measuring device that
>was
>>>moved by a thumbscrew and a monocular 'scope set at about a 30 degree
>angle
>>>with a back light.
>>>
>>>The measurement was taken by moving the needle down until it contacted
>the
>>>top of the paste, zeroing out the Mititoyo, then driving the needle
>down
>>>until it touched the pad itself. The Mititoyo then read out the
>thickness
>>>of the paste.
>>>
>>>Does anyone know of such a simple system out there anymore?
>>>
>>>TIA
>>>
>>>Charlie B.
>>>
>>>################################################################
>>>TechNet E-Mail Forum 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://jefry.ipc.org/forum.htm) for
>additional information.
>>>For the technical support contact Dmitriy Sklyar at [log in to unmask] or
>847-509-9700 ext.311
>>>################################################################
>>
>>
>>Ron Lohrbach
>>Norris Communications
>>(619)679-3137 Tel/VM
>>(619)486-3922 FAX
>>[log in to unmask]
>>http://www.norriscomm.com
>>
>>################################################################
>>TechNet E-Mail Forum 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://jefry.ipc.org/forum.htm) for
>additional information.
>>For the technical support contact Dmitriy Sklyar at [log in to unmask] or
>847-509-9700 ext.311
>>################################################################
>>
>>
>
>
>______________________________________________________
>Get Your Private, Free Email at http://www.hotmail.com
>
>################################################################
>TechNet E-Mail Forum 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://jefry.ipc.org/forum.htm) for additional
>information.
>For the technical support contact Dmitriy Sklyar at [log in to unmask] or
>847-509-9700 ext.311
>################################################################
>
>################################################################
>TechNet E-Mail Forum 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://jefry.ipc.org/forum.htm) for additional
information.
>For the technical support contact Dmitriy Sklyar at [log in to unmask] or
847-509-9700 ext.311
>################################################################
>
>
>
----------------------------------
Jeff L. Hempton phone: (219) 429-7335 Fax: (219) 429-4688
Sr. Development Engineer
Raytheon Systems Company
1010 Production Road, Fort Wayne, IN 46808-4106
Mail Stop: 25-31
Email: [log in to unmask]
"The man who rolls up his sleeves seldom loses his shirt."--Thomas Cowan
################################################################
TechNet E-Mail Forum 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://jefry.ipc.org/forum.htm) for additional information.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311
################################################################
|
