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Reply To: | TechNet E-Mail Forum. |
Date: | Thu, 12 Feb 1998 09:56:00 PST |
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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
>(619)486-3922 FAX
>[log in to unmask]
>http://www.norriscomm.com
>
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