My thoughts seem to go along with the rest of the responses. If your customer wants wrist-straps, why not give them straps? If they are the only customer making noise (assuming that there is more than one customer) then just get enough straps for assemblers working on that customer's stuff. (And charge the extra expense to that job!!!) Ultimately whatever gets done usually gets done to make the customer happy. If they are willing to pay you to get wrist straps to make them happy, why not do it. If it becomes a really large expense and the customer is not willing to help defray costs, then start pilling ammo for your arguments on why you should have to do this.
Just my opinion on a Friday PM!
Eric Kalgren
BFGoodrich Aerospace
Data Systems Division
>>> Ryan Grant <[log in to unmask]> 11/05/99 02:24PM >>>
Very interesting Phil. I haven't gotten involved with ESD policies very
much, but I would very much like to know how you conducted your
measurements. Every now and then questions come up on the factory
floor. I would like to be able to dispel or confirm whatever belief
people have concerning ESD.
Thanks
Ryan Grant
Process Development Engineer
MCMS
(208) 898-1145
FAX (208) 898-2789
[log in to unmask]
>-----Original Message-----
>From: Phil Bavaro [SMTP:[log in to unmask]]
>Sent: Friday, November 05, 1999 10:13 AM
>To: [log in to unmask]
>Subject: Re: [TN] Wrist wraps for seated operators
>
>It has been my experience that the ESD policy needs to be set by
>measurements, data, and more measurements, not logic. Otherwise, ESD
>programs can get very expensive to implement.
>
>One of my many hats as a process engineer has been ESD Program Manager, and
>while I agree that the aforementioned rationales seem totally logical, I'd
>like to know if Mike and Howard have actually measured the voltage
>potentials involved.?
>
>I've studied this particular situation very extensively and every time find
>that there is no difference between standing, sitting, or even sitting with
>their feet in the air.
>
>My conclusion has always been that the large hull effect of the dissipative
>floor does not allow for the potentials to accumulate on the operators
>above it.
>
>If anyone does have data contrary to this, I'd appreciate a chance to
>discuss this with them.
>
>
>Phil Bavaro
>"ESD Program Manager"
>____
>
>
>At 08:47 AM 11/5/99 -0500, Cyker, Howard A (Howie) wrote:
>>The rationale for using a wrist strap when seated is to provide a consistent
>>and constant level of grounding. Grounding through conductive chairs would
>>rely on grounding through the clothing, which is unpredictable and
>>unreliable. Grounding through conductive shoes, of course, requires
>>constant contact with the floor, which cannot be guaranteed while sitting.
>>
>>> Howard A. Cyker
>>> Lucent Technologies
>>> Email [log in to unmask]
>>> Phone 978-960-2964
>>>
>>>
>>>
>>> ----------
>>> From: d. terstegge[SMTP:[log in to unmask]]
>>> Reply To: TechNet E-Mail Forum.;d. terstegge
>>> Sent: Friday, November 05, 1999 4:27 AM
>>> To: [log in to unmask]
>>> Subject: [TN] Wrist wraps for seated operators
>>>
>>> Hello Technet,
>>>
>>> We've recently received some complaints from a customer who is not happy
>>> with the fact that our operators don't wear wrist wraps during seated
>>> operations like handsoldering and inspection. Our factory relies on
>>> grounding through the (conductive) chairs, ESD-shoes, conductive floor and
>>> ESD-workbenches, but the chairs are tested only once per year, which is
>>> obviously less frequent then one would test wrist wraps.
>>> Is the customers concern justified, and should we introduce wrist wraps ?
>>>
>>> Daan Terstegge
>>> Unclassified
>>>
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