Let’s start from the ground up, and since the length of the leg
is dependant upon the height of the caster, then that is where we shall
begin. Selecting the caster from the catalog we see that a 2299 swivel
caster has a 75-pound capacity. Four of these will distribute the load
between them, for a total of 300 pounds; 50 pounds more that is necessary.
This is the caster we will use, since it offers us a margin of safety.
First, go to the modified SW Isometric View by clicking the
button on the AutoQuoterX Toolbar.
Now open the Main AutoQuoterX Form by clicking the
button on the AutoQuoterX Toolbar, or by typing 82 and pressing
return at AutoCAD's command prompt.
To easily find the part, enter the 2299 part number into the Search Box
(Figure 2), and press the
button. You will be taken directly to that part, it's thumbnail graphic
will be displayed, and you will see a catalog description of the part.
button. When prompted for an insertion point, type in 0,0,0. This location
is very important, as it will allow us to take several shortcuts later,
that would not be possible if we started our design at some unknown or
arbitrary point in space.
Accept the Rotation of the caster, and exit the AutoQuoterX Main
form (Figure 3).
The caster should
now appear as it does in Figure 4.
Measure the distance between the center point of the "Swivel
Radius" arc, and the insertion node located in the stem. It should
measure 3 inches. This is the nominal working height of this caster. Move
the leg and the caster to floor level by entering AutoCAD's MOVE command,
selecting the center of the "Swivel Radius" arc as the Base
Point, and typing 0,0,0 for the To Point. The caster should now appear
as it does in Figure 5.
This finishes setting the location which will simplify the entire
drawing process by allowing you to know exactly where certain parts are
located in AutoCAD® from the WCS Origin.