Unidirectional: All dimensions are written horizontally.Dimensions can always be readable either from the bottom or the right of the drawing. Aligned: The notations (text and numbers) are parallel to the dimension line.There are two common methods of aligning notations, “Aligned” is the most common.Generally this is not required, unless in clears up why a dimension string does not close off. Where the “plus minus” symbol appears after a number, the number has been rounded of to the nearest whole number.Dimensions that are not to scale are underlined or noted “NTS”.In the Power Dimensioning Edit Geometry dialog box, enter a numerical value in the Text offset from dimension line box. Click Power Dimensioning tab Format panel Edit Geometry. The Power Dimensioning Ribbon Contextual Tab displays. Auxiliary dimensions should be shown in brackets or noted “REFERENCE”. In the drawing area, double-click the dimension you want to edit.In architectural, you would type the following at the prompt for your example length: 13-9-1/2' You need the hyphens, a space is interpreted as 'enter'. Where all component dimensions must be specified, and overall length should be specified as an auxiliary dimension. You need to set the units to architectural or fractional. When specifying an overall dimension, one non-critical component dimension should be omitted.Angular dimensions are specified in decimal degrees, degrees and minutes or degrees minutes and seconds.Dimensions lest than 1 should lead with a “0” before the decimal point.Place a note in the title block stating “ALL DIMENSIONS IN mm” to avoid the need to specify “mm” after every number. Dimensions are usually in millimetres (millimeters).15 x scale is the formula for working out the gap between dimension lines and the object.For dimensions that cannot be drawn to there true termination point, the free end is terminated in a double arrowhead.Thin linework should be used of dimension and projection lines.Arrowheads are usually 3x1mm and ticks, 2mm long. They generally terminate with and arrowhead or tick. Dimension lines run between the projection lines.An extension of 2mm is generally drawn past the dimension line. A gap of 1mm is generally drawn from the object to the start of the projection line. Projection lines indicate extremities of a dimension.As you can see below, we now have a Square with sides of 254mm. In this case, because I am going from Inches to Millimeters, I enter 25.4. Then you are prompted to Specify Base Point, I normally use 0,0,0 and finally, you are asked to Specify Scale Factor. I generally type All in the Command Window, that way all entities in the drawing get scaled up. To do this, type Scale at the Command Window or select it from the Modify menu. As we all know, 1 Inch is equal to 25.4mm, so to get the square to the correct size, all we do is use the Scale command to scale the entities by 25.4. As you can see below, the square now has a side of 10mm. Next, under Units Scale, select Millimeters as the Block Units Format. To do this, in the Length selection box, choose Decimal and in the Angle selection box, choose Decimal Degrees. As you can see, they are all in Imperial/ Inches, so we need to change them to Decimal / Millimeters. The first step is to go to Options, then Drawing Settings and Unit System and check the Units. So, what can you do if you realise you’ve receive a drawing in the wrong units? Read on, it’s very simple to sort out.Īs you can see below, I have a drawing of a square with sides of 10 inches. If I go to Options, then Drawing Settings and Unit System, this is what I see.Īs you can see above, I’m using Decimal for both Length and Angle and my Units Scale is set to Millimeters (Millimetres over here). I live in Europe, so the standard unit of measurement over here is Decimal, that means Metres, Centimetres, Millimetres and so on. A mistake I often see from new CAD Users is that they are drawing using the wrong units.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |