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*Cometto, Sergio
Message 1 of 4 (396 Views)

Kfactor

396 Views, 3 Replies
07-07-2003 07:06 AM
Hi all

Which true value of Kfactor in Sheet Metal can I use to work with

thikness (metric system) 1 mm - 1.2 mm - 1.5 mm - 2 mm - 3 mm - 4 mm - 5
mm - 10 mm - 20 mm ??

I am confused about that

Thanks for any suggestions

Sergio Cometto from Italy
*Berry, Patrick
Message 2 of 4 (396 Views)

Re: Kfactor

07-07-2003 07:36 AM in reply to: *Cometto, Sergio
Kfactor is specific to the material and condition of material. Most shops
either use standard values as approximations or determine them
experimentally. The thinner the material the less critical the kfactor
becomes. What material and thickness are you working with?

Pat

"Sergio Cometto" wrote in message
news:74141F32DF1A28F7638847AB7B2A2F81@in.WebX.maYIadrTaRb...
> Hi all
>
> Which true value of Kfactor in Sheet Metal can I use to work with
>
> thikness (metric system) 1 mm - 1.2 mm - 1.5 mm - 2 mm - 3 mm - 4 mm - 5
> mm - 10 mm - 20 mm ??
>
> I am confused about that
>
> Thanks for any suggestions
>
> Sergio Cometto from Italy
>
>
*Cometto, Sergio
Message 3 of 4 (396 Views)

Re:

07-09-2003 06:54 AM in reply to: *Cometto, Sergio
Berry

I work normally with steel or AISI 303 or 304

Where I can get Kfactor for that?

Thank you

Sergio Cometto from Italy

"Patrick Berry" ha scritto nel messaggio
news:06FE3ECEBB117522C3C54CCE15090F1D@in.WebX.maYIadrTaRb...
> Kfactor is specific to the material and condition of material. Most shops
> either use standard values as approximations or determine them
> experimentally. The thinner the material the less critical the kfactor
> becomes. What material and thickness are you working with?
>
> Pat
>
> "Sergio Cometto" wrote in message
> news:74141F32DF1A28F7638847AB7B2A2F81@in.WebX.maYIadrTaRb...
> > Hi all
> >
> > Which true value of Kfactor in Sheet Metal can I use to work with
> >
> > thikness (metric system) 1 mm - 1.2 mm - 1.5 mm - 2 mm - 3 mm - 4 mm -
5
> > mm - 10 mm - 20 mm ??
> >
> > I am confused about that
> >
> > Thanks for any suggestions
> >
> > Sergio Cometto from Italy
> >
> >
>
>
*Berry, Patrick
Message 4 of 4 (396 Views)

Re:

07-09-2003 07:45 AM in reply to: *Cometto, Sergio
The Machinists Handbook gives .55 for Al and Brass, .64 for soft steel and
.71 for cold rolled steel. Stainless is notoriously anisotropic and
sensitive to grain direction but a K factor of about .65 should get you
fairly close. Sheet metal workers normally determine these values
experimentally based on the materials they commonly work with. This value
is much less critical with thinner sheets than thicker ones. If you don't
have sheet metal capabilities in house your best bet is to just give the
shop a drawing of the finished part and let them work out the bend
tolerances. Hope this helps.

Pat

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