Strip thickness tolerance 1

[MagBen]

My customer asks for .147mm - .151mm strip product, i.e. the tolerance is +/- 1.34% (width 12''), saying another supplier can meet the tolerance. Is that possible? If yes, what kinds of equipment or practices are needed to accomplish that tight tolerance?

 

[MintJulep]

Metal, rubber, plastic, bubble gum, silly putty......?

 

[ctopher]

Call your supplier and ask them?

Chris
SolidWorks 13
ctopher's home
SolidWorks Legion

 

[pmarc]

I am looking at this link... :

http://www.smt.sandvik.com/en-gb/products/strip-steel/size-tolerances/#tab-thickness-tolerance-inch

... and it seems that this is not a science-fiction (at least for this supplier). Of course I assumed we are talking about steel.

How do they accomplish this? I do not know - I know almost nothing about metal strip manufacturing. But I know how to use google .

 

[MintJulep]

And on another page from the Sandvik link:

Our cold rolling mills can produce precision strip and foil in thicknesses down to 0.015 mm (0.0006 in.), with tolerances down to +/-0.001mm (0.00004 in.) and in widths up to 1200 mm (47.25 in.).

 

[Tenkan]

If were talking metals (stainless) there is an astm spec that governs strip and sheet thickness tolerance (ASTM A480 I think…). You don’t control the thickness the mill source does (see sandvik… ) and you supply your customer with a copy of the material certs the source will supply.

lightweight, cheap, strong... pick 2

 

[dgallup]

We get foil rolled to a 5 micron total tolerance, what your customer is asking for is not much different. Material choice will make a big difference.

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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

 

[MagBen]

It is metal material. I donot know if other materials, e.g. rubber, plastic, can be called strip product, but I can be wrong.

ASTM (there are a huge number of tolerance specs based on materials), and ISO 9447 standard tolerances are much looser than what the custoemr is asking for. Our internal limits are much tighter than ISO tolerance, but still looser than the req's.
The only solution I could find was to cold roll wider than needed and to discard the out of tolerance material. but obviously, this means a substantial decrease in yield and a substantial increase in cost.

By the way, Google is a good tool for a general question, but hardly useful for an expert in the field.

P.S. Even the best tolerances listed by Sandvik can not meet my customer's req's.
At .0006'', a tolerance of +/- .00004'' sounds not that impressive, it is +/- 6.7%. My company can do .0006'' +/-.00003''.

 

[ctopher]

.147mm - .151mm strip product, i.e. the tolerance is +/- 1.34% (width 12'')

Wouldn't this be a sheet?

Chris
SolidWorks 13
ctopher's home
SolidWorks Legion

 

[MagBen]

They are not strictly defined, but, normally, a sheet is >=24'', and a strip <24''.