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Letter 2084
Quality margins
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We are a plant that produce buckles for shoe industry here in
leÛn. We have been in the bisness for two year so we don`t have
all the practical information we like.
our batchs are of 500 pieces each and i want to ask about the size
of sample to asegure 0.5% of regrets. in adition with i ask about the
procedure to get this.
i also ask about the margin of error in this kind of industry
world wide ( 0.05% regrets, or 1 p.p.m) so we can compare how long we
have to go on this
Ing. Alejandro Lanzagorta
redi-metal leon,guanajuato,mexico
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Mr. Lanzagorta,
Are you referring to the reject rate from one operation, such as
plating?
If you are barrel plating 500 pieces at a time, assuring a low
reject rate will depend heavily on quality control of the plating
solutions and physical plant maintenance of the barrels and contact
danglers configuration of the buckles and how they nest with each
other and as a load tumbling in the barrel margin of error in barrel
plating, depending upon the shape of the part, and some of the
factors given above can be 100 ppm (rarely) or as much as 100,000
ppm.
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Dear Mr Pullizzi:
I apreciate the time you gave to this letter.
i was not as clear as i thougth. i was asking about the quality
margin as a plant and not only in finishing operation.
In fact, we have 0.1% error there ( as finishing operation) and we
think it`s good.
so, i ask you if you can lead us to someone that can help us in
this search, because our principal quality problem is porous surface
and we are trying to avoid the pieces get finish.
once again thanks for your time
Ing. Alejandro Lanzagorta
redi-metal leon,guanajuato,mexico
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