Basic dimension

[tubthumper59]

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.

 

[ctopher]

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.

 

[drawoh]

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.

 

[ewh]

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

 

[chicopee]

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.