Slide 1: Isometric drawings represent an object in three dimensions…. …helping to visualize the features of an object on at least three sides. Introduction Slide 2: The main differences in the isometric drawings we will draft in this unit and the isometric sketches that we produced previously are;
We will be creating the isometric drawings using the drafting tools that are supplied in your draft pack.
We will be drafting a sheet layout with the title block for each isometric drawing we complete.
We will be using the architect’s scale to measure the parts of the object. Introduction Slide 3: Before proceeding with the steps in drafting an isometric drawing, lightly draft the sheet layout that is specified in the assignment. One of the last steps in completing the isometric drawings will be to darken the border lines and label the title block. Sheet Layout Slide 4: Let’s review the steps to centering an object on a drawing sheet: Find the center of the paper.
Measure along the 30 degree axis 1/2 of the length.
Measure along the 30 degree axis 1/2 of the width.
Measure along the vertical axis 1/2 of the height. 7 4 This corner becomes the starting point for the isometric drawing. The drawing will be centered on the sheet. Remember we want to find the front corner of the object.. Isometric Object Step-by-Step Slide 5: Lightly draft a box that will enclose the entire object. To do this we will draw random-length lines coming off of the starting point found earlier.
Rest the 30-60 degree triangle on the parallel bar and run a line through the starting point in each direction creating the outside corner of the box. 7 Isometric Object Step-by-Step Slide 6: Use the architect’s scale to measure the height, length and width of the object along the random-length lines.
Use the 30-60 degree triangle to draft all of the lines. 7 Isometric Object Step-by-Step Slide 7: “Carve out” the object from this box.
Use the architect’s scale when measuring.
Use the 30-60 degree triangle to draft the lines of the object. 7 Isometric Object Step-by-Step Slide 8: Erase any construction lines.
Darken the object lines.
Label the sheet.
Darken the border lines. 7 PLATE 1-1 SCALE: 1=1 DATE: 9/9/05 DRN.BY: PNS SHEET 1 OF 1 Isometric Object Step-by-Step Slide 9: We will be drafting simple objects in the isometric format, and we will also be drafting more complex isometric drawings of various framing details that are typical in new construction.
Let’s discuss what steps must be taken to draft a more complex isometric drawing, such as a framing detail. Framing Detail Introduction Slide 10: Isometric drawings representing various types of framing can be very beneficial in explaining a building procedure to the contractor, subcontractor, vendor or designer. Here is a typical framing detail of an exterior corner of a wall. Framing Detail Introduction Before we begin, we will need to familiarize ourselves with the actual sizes of the framing members. Slide 11: When a framing member is called out as a 2 x 4 , 2 x 6, 2 x 8 or 2 x 10, these are the nominal sizes of the lumber.
When the lumber is milled and dried, the actual size of the lumber will be as follows:
2 x 10 1 ½” x 9 ¼”
2 x 8 1 ½” x 7 ¼”
2 x 6 1 ½” x 5 ½”
2 x 4 1 ½” x 3 ½” Nominal Size We will be using a 2 x 6 for the framing members in this example. Framing Detail Lumber sizes Actual Size Slide 12: Framing Detail Step-by-Step To start the drawing,
Select the starting point on the inside corner of the wall.
Using the 30-60 degree triangle;
Draft a vertical line from the starting point.
Draft a line to the right of the vertical line.
Draft a line to the left of the vertical line. These lines will be the start of the inside corner of the wall. Slide 13: Framing Detail Step-by-Step Place the architect’s scale (1 ½” = 1’-0”) on the vertical line.
Mark the thickness of the 2 x 6 bottom plate. (actual thickness is 1 ½”).
Draft a line using the 30-60 degree triangle. Begin by drawing the bottom plate of the corner wall framing.
We do this by first locating the thickness of the bottom plate. Slide 14: Framing Detail Step-by-Step Draft another line to show the thickness of the adjacent plate.
We will then locate the width of the 2 x 6 bottom plate.
Place the architect’s scale (1 ½” = 1’-0”) on the line.
Mark the width of the 2 x 6 bottom plate (actual width is 5 ½”).
Draft a line using the 30-60 degree triangle. 5 ½” Slide 15: Framing Detail Step-by-Step We will now complete the second bottom plate, using the lines created.
Draft lines for the bottom plate using the 30-60 degree triangle.
Let’s erase some of the construction lines so that we can see how the 2 x 6 bottom plate looks. Slide 16: Framing Detail Step-by-Step Let’s start to draft the 2 x 6 stud that rests on top of the bottom plate.
Using the architect’s scale,
Mark the thickness of the 2 x 6 stud (actual thickness is 1 ½”.)
Draft the lines for the 2 x 6 stud, using the 30-60 degree triangle, Slide 17: Framing Detail Step-by-Step Continue to mark the location of each 2 x 6 stud on the bottom plate.
The actual spacing of the 2 x 6 studs is 16” O.C. (on center).
The center of the first stud will be located 16” from the outside wall.
Then the spacing will be 16” O.C. for each consecutive stud. 16” O.C. 16” O.C. 16” O.C. 16” O.C. These two studs act as a nailing surface for the drywall that will be installed on the interior. Slide 18: Framing Detail Step-by-Step Using the architect’s scale,
Mark the location of the 2 x 6 stud.
Mark the thickness of the 2 x 6 stud (actual thickness is 1 ½”).
Complete the lines of the stud. 16” 16” O.C. 16” O.C. 16” O.C. 16” O.C. Mark ¾” on each side of this mark. This is one-half of the stud thickness. Slide 19: Framing Detail Step-by-Step Continue to locate and mark each stud on the bottom plate.
Lightly draft the lines of each stud.
Lightly draft the section symbol for each stud. Slide 20: Framing Detail Step-by-Step Darken the lines of the framing detail.
Label the drawing (title and scale). CORNER FRAMING DETAIL
SCALE 1 ½” = 1’- 0” Slide 21: This is a hand-drafted isometric of the corner framing detail in progress. Framing Detail Sample Drawing