isometric drawing create the illusion of 3 dimension by drawing the depth of the object on the both side.. in isometric drawing they are both set on the 30 degree angle..
This is a reference dimension. I.e. the part can and should be manufactured without using it directly. The non-bracketed dimensions should define the form of the part completely.
Generally it means that the dimension is for reference only. The actual (real dimension) will show up somewhere else on a drawing. It could also be put on a dimension that you really don't want an inspector to hold tight (material thicknesses that vary with vendor or batch run)
If the scale is 1 to 16, then each dimension in the real world is 16 times its size on the drawing, and its size on the drawing is 1/16 of its real size. The barn must be drawn 2-ft high on the plans.
there are several different types of lines used in dimensional drawing, most are vertical and horizontal in design.
Underlined
Scale provides the ability to measure a depicted feature or arrangement of features on the drawing, and scale it to what it was / will be in the real world. It is not always possible to dimension every possible feature, and a scaled drawing allows someone to infer what a given dimension will be.
Ref usually means that this dimension (and any associated tolerancing), is specified somewhere else, possibly on a lower level sub-assembly drawing.
Every dimension has a shown or implied tolerance, the dimensions shown as HOLD are the dimensions that are not to be affected by the stack up of tolerances of the holes or features around them.
NTS
The first dimension string on an architectural drawing should begin at the point representing the starting reference point of the dimension being measured. This point is typically indicated by a small arrow or dot.
No, then it would not be a reference dimension. Reference dimensions by definition have no tolerance.
A 3D drawing is a three dimensional drawing. There are a number of ways an artist can convey dimension in a drawing. Perspective is one of them. Shading and contouring are others.
.125 STOCK
relative and polar
name the period of the underlined digit
An orthographic drawing attempts to represent a 3D picture in a two dimension drawing. Usually shows a front, side and plain view