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Basic dimension

Basic dimension

Basic dimension

(OP)
Is there an importance on how many places after the decimal in a basic dimension has. I have not found anything that states how many places, but all the references I have seen show 3 places.

RE: Basic dimension

No std on how many places. 3 places is most common. How many places you need for your tolerance. If you do maybe 5 or more places, most machines shops will question it because is not common.

RE: Basic dimension

Tubhumper,

   There is no significance to the number of decimals after a basic dimension as per ASME Y14.5M-1994.  The feature you are dimensioning is controlled by the geometric tolerances you have applied.

   The standard states that you do not show the trailing zeros on metric dimensions.  I would assume that this is done to make metric drawings look different from English units.  I wish my CAD software sould support this properly.

   If the dimension is not basic, ASME Y14.5M-1994 allows a tolerance note to define tolerances as per the number of decimals.  

RE: Basic dimension

It is accepted practice to use the same number of decimal places as is used in the geometric control block.

RE: Basic dimension

Are your dimension units in the imperial english or metric? To me it seems that you are using english units but I just want to double check.

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