Hello,

During dimensioning process in AutoCAD, the dimension increases automatically based on the measurement of the spacing you are dimensioning. Due to the fact that many inexperienced users do not well understand the units, or sometimes directly draw with scale or simply draw roughly,  the measured value in AutoCAD does not give the exact value. I recommend those users to have a look at my article called “Understanding scale concept and units in Autocad” and also the other article of Prof. Günay Özmen called “Scaling in Autocad drawings and layouts”. I will describe the “Primary Units” tab for the users who experience incorrect values (or different from the expected) even though everything looks ok. This lecture is of advanced level, therefore please read it carefully.

Fig. 1 The units affect the appearance.

Let’s have look at the unit in Fig.1. The writing style of this dimensioning has not been edited and it has directly written on the measured value. At the first look there are two unnecessary situations in the dimensioning. The first thing is the writing style of 5,000 where the zeros are unnecessary. The second is the needless three decimals in 16,405 measured value (sometimes 1/100 scale can be acceptable) Let’s eliminate these two situations.

Fig. 2. The unit changes are performed under the “Primary Units”tab.

When we examine the “Linear Dimension” section in detail in Primary Units tab we can solve our problem above and can make some necessary changes.  First of all , we solve the precision value by adding 00 in Precision section. The other one can be solved by check the “Trailing” in “Zero Suppression” section. “Trailing zero suppression” means hide the zeros after commas should be checked. We have completed the first phase.

Fig.3. The extra zeros and numbers were eliminated by the adjustments we performed.

Now let’s have look at the other items and see how it works:

Round Off value can be used whenever requested. For example in architecture 5mm precision is being used and cm is accepted as standard unit. Therefore from this time only 0.5 precision after the point is very important for us. If “Round off” value is entered as 0.5 then 24.6 will be showed as 25.0 as well as 24.3 will be showed as 24.5. In other words if the value is greater than 0.5 then it rounds the latter value if not it rounds the former one.

Prefix and Suffix values are used when you want extra writing in front or behind of the values. For example if the suffix value is entered as mm then mm expression will be displayed in the screen (25 mm).

Scale Factor is used when you want to multiply the measure value. For example in spite of our all warnings you have drawn one to one means 1/50 (1 m = 2 units) drawing. If Scale Factor is made as 50 it will give the measured value in cm. If you make it only in the Layout portion please click on the mini table below in order to prevent other values to be not disturbed.

Fig.4. The unit can be also written.

Also you can do the same things in the section divided by angles therefore I will not describe the same things again. Good luck.

BU yazinin Turkce’sini okumak icin basiniz…

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• Dimension Style Settings 6 : Alternate Units
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• Dimension style settings 4: If the dimension doesn’t fit…
• Dimensioning III

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Autocad, Dimensioning