Unable to figure out the flatness tolerance specified for an equipment mounting

[alphonsejoe]

I have received a requirement for preparing the equipment foundation with flatness as below.

Specified tolerances
± 0.7 mm ± 0.21 angle ± 1°

Unable to figure out why two values are specified for flatness tolerance. Please can someone give an insight into this flatness tolerance specified.

Thanks in advance
Alphonse

[Cragyon]

Is it specifically called "Flatness"? This is a construction / Architectural drawing?

[alphonsejoe]

Is it specifically called "Flatness"? This is a construction / Architectural drawing?

Actually we had asked for the flatness tolerance as this was missing in the drawing, We then got the response from vendor
"Specified tolerances on
± 0.7 mm ± 0.21 angle ± 1°"

Thank you for the response...

[alphonsejoe]

Actually we had asked for the flatness tolerance as this was missing in the drawing, We then got the response from vendor
"Specified tolerances on
± 0.7 mm ± 0.21 angle ± 1°"

Thank you for the response...

It was a drawing for mounting of an equipment which needs a foundation with normally very fine flatness tolerances

Thanks

[Kelly_Bramble]

Is there an engineering drawing dimensioning and tolerancing standard specified? ASME Y14.5 or ISO 1101?

[alphonsejoe]

Is there an engineering drawing dimensioning and tolerancing standard specified? ASME Y14.5 or ISO 1101?

No standards mentioned.

[Kelly_Bramble]

The specification does not have any known meaning to any dimensioning and tolerancing standard I'm familiar with.

You should consult with the engineering drawing creator and request a written specification on how to interpret and measure to the specified flatness provided.