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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