I recently attended a local chapter meeting of SMTA where an engineer
from one of the screen printer manufactureres spoke. He talked about a
design of experiment they performed on the screen printing process and
found that the second most significant factor of those examined (just
slightly behind pad orientation), was the paste measurement system
(namely a Cyberoptics Cybersentry).
Steven Lustig
Process Engineer
EMS Technologies
>----------
>From: Landes, Jeff[SMTP:[log in to unmask]]
>Sent: Thursday, February 12, 1998 12:56 PM
>To: [log in to unmask]
>Subject: Re: [TN] Assy: Solder Paste Height Measurement
>
>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.
>>>
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>>
>>Ron Lohrbach
>>Norris Communications
>>(619)679-3137 Tel/VM
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>>[log in to unmask]
>>http://www.norriscomm.com
>>
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