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Tutorial 4.2

UCS Manipulation

Learning Objectives

 After completing this tutorial, you will be able to:

• Change the User Coordinate System (UCS) according to design needs.

• Use 3D coordinate entry for drawing objects.

• Create a 3D model given orthographic views of the object.

Required Competencies

• Competency #1

• ast

User Coordinate Sstem

The three-dimensional coordinate system determines how 3D objects will appear when

inserted into the drawing environment. In order to minimize the amount of secondary operations

required to locate the objects in the modeling environment we will create a User Coordinate

 System !UCS". The #$% will allow the designer to manipulate the X-Y plane for &D drawing the

'-a(is for e(trusions or objects with height or the orientation of the 3D coordinate a(es.

There are many options in the #$% command for how to specifically change or modify thecoordinate system. This tutorial will attempt to ta)e the student through several of the most

useful operations for manipulating the #$%.

!uilding t"e angle bearing brac#et

The following tutorial will ta)e the student through the steps necessary to build the solid

model of the *ngle +earing +rac)et shown orthographically in ,igure .&-.

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$igure 4.2%&. !ngle "earing "racet orthographic drawing.

. $reate a BOX at /// with dimensions 0/ units long by 1/ units deep by / units

thic). $hange VIEW to %2 Isometric.

$igure 4.2%2.  "o$ with dimensions %&$'&$1&.

&. $reate a second BOX using the top-front corner on the right of the first bo( as theorigin. The new bo( should have dimensions of / units by 1/ units and a height of

negative / units.

2 Introduction to 3D Modeling

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$igure 4.2%'.  ertical bo$ joined with horiontal bo$.

3.   UNION the two bo(es together.

.   Tools ull-Down menu -4 NEW UCS command. %elect the Y-Axis option. 5otate

the #$% about the 6-a(is 3/7 in order to get the 8-6 plane oriented for the inclined

surface.

$igure 4.2%4. UC* positioned and rotated for inclined s+rface.

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1. Draw a BOX from the origin with the dimensions -3/ units long 1/ units wide and

/ units thic).

0.   UNION the two objects together.

$igure 4.2%(.  ,nclined s+rface joined to composite solid.

9. Draw a CYLINDER  with the center at the Midpoint  of the bac) edge of the object.

The diameter of the cylinder is 1/ units and the height is / units.

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:.   UNION the cylinder to the solid object. The basic shape of the *ngle +earing

+rac)et is now completed.

$igure &%). "asic !ngle "earing "racet.

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Creating Clindrical Objects

;. #sing the 3-Point option of the UCS command create an 8-6 plane on the top face

of the inclined surface as shown.

$igure 4.2%*. -hree points selected for UC* orientation.

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/. Draw a CYLINDER with the center located at the Center  of the arc on the topsurface of the inclined plane. The diameter of the cylinder is / units and the height

is &/ units.

$igure 4.2%+. Cylinder added to the inclined s+rface.

.   UNION the cylinder with the *ngle +earing +rac)et.

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&. $reate a CYLINDER  located at Center  of the upper face of the e(isting cylinder.The diameter is &/ units and the height is minus 3/ units.

$igure 4.2%,. Cylinder added to !ngle "earing "racet.

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3. $reate a second CYLINDER  in the same location with a diameter of 3/ units and aheight of minus 1 units.

$igure 4.2%&-.  Co+nterbore cylinder(red) added to previo+s cylinder.

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.   COPY this second cylinder from its own bottom center  to the bottom center  of thelong cylinder.

$igure 4.2%&2.  Co+nterbore cylinder copied into position.

1. Issue the SUBTRACT $ommand. <hen prompted select the *ngle +earing

+rac)et. =it an Enter >ey. <hen prompted to select object or regions to subtract

select the long cylinder and the two counterbore cylinders. =it an Enter >ey. *ll

three cylinders will be subtracted from the *ngle +earing +rac)et at the same time.

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$igure 4.2%&'. ole with co+nterbores created in inclined cylinder.

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Creating egs

0. #sing 3-D Orbit change the viewpoint so that the bottom of the object is visible.

9.

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$igure 4.2%&4.  /0 plane repositioned to vertical s+rface.

:. #sing the 3-Point option of the UCS command create an (yz a(is along the surface

shown with (-a(is to the right y-a(is up and z-a(is out of the material towards theviewer.

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&/. #se the X-Axis O!tion of the UCS $ommand to rotate the a(is through 1-degrees.

$igure 4.2%&(. UC* /0!$is rotated thro+gh 5'0degrees.

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&. $reate a CYLINDER  located at the Origin of the #$%. The cylinder diameter is

units and the length is negative 3/ units.

$igure 4.2%&). Cylinder created thro+gh base.

&&.   "OVE the cylinder in the positive ' direction until it is entirely through the vertical

feature of the solid object by moving the cylinder from ? to ?//1.

$igure 4.2%2-.  Cylinder for hole moved into position for s+btracting.

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&3.   SUBTRACT the cylinder from the solid object.

$igure 4.2%2&. ,nclined hole created in vertical feat+re.

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&. #se 3D ORBIT to view the object from the bottom.

&1. #se the 3-Point option of the UCS command to ma)e the bottom surface of the

object the 8-6 plane.

$igure 4.2%22.  /0 plane repositioned to +nderside of object.

&0. #se the Oriin option of the UCS $ommand to move the origin to /3//.

&9. $reate a CYLINDER  at /3// with a diameter of / units and a height of / units.

&:. Create a second CYLINDER  3& +nits to the right of this cylinder.

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$igure 4.2%2). -wo cylinders added to +nderside of object.

&;. To finish the model UNION the two cylinders to the solid object.

$igure 4.2%2*. -wo views of finished angle bearing bracet.

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