Department of Mechanical Engineering

Machine Design & CAD-II Lab (MEEN-3238)

Lab Report 9

Submitted To Engr. Adnan Rasheed

Submitted By Sarmad Hafeez

Regd. No. ME171005

Semester 6th
 Table of Contents
1. Objective: ................................................................................................................................ 1

2. Theory: .................................................................................................................................... 1

2.1. Split Entities: .................................................................................................................... 1

2.2. 3D Loft Feature: ............................................................................................................... 1

Profiles .................................................................................................................................... 2

Start/End Constraints .............................................................................................................. 2

Guide Curves........................................................................................................................... 4

Centerline Parameters ............................................................................................................. 6

Sketch Tools ............................................................................................................................ 7

Options .................................................................................................................................... 7

Thin Feature ............................................................................................................................ 8

2.3. Rib Feature In 3D Mode: ................................................................................................. 9

3. 3D Sketching Practice Drawing 7: ........................................................................................ 14

3.1. Procedure of Drawing: ................................................................................................... 14

 Lab Session 9
1. Objective:
To practice the split entities command in 2D sketch mode and split, loft & rib features in 3-
Dimensional feature mode and to exercise a 3D part drawing (3D Drawing-07).

2. Theory:
2.1. Split Entities:
You can split a sketch entity to create two sketch entities. Conversely, you can delete a split point
to combine two sketch entities into a single sketch entity. Use two split points to split a circle, full
ellipse, or a closed spline. You can dimension to a split point. Also, you can insert parts at split
points in a routing assembly.
To split a sketch entity:

1. In an open sketch, click Split Entities (Sketch toolbar) or Tools > Sketch Tools > Split
Entities.

2. The pointer changes to .

3. Click the sketch entity at the location where you want the split to occur.
The sketch entity splits into two entities, and a split point is added between the two sketch entities.
2.2. 3D Loft Feature:
Loft creates a feature by making transitions between profiles. A loft can be a base, boss, cut, or
surface. You create a loft using two or more profiles. Only the first, last, or first and last profiles
can be points. All sketch entities, including guide curves and profiles, can be contained in a single
3D sketch.
To create lofts:
Do one of the following:

1. Click Lofted Boss/Base on the Features toolbar, or click Insert, Boss/Base, Loft.

2. Click Lofted Cut on the Features toolbar, or click Insert, Cut, Loft.

3. Click Lofted Surface on the Surfaces toolbar, or click Insert, Surface, Loft.
Set the Property Manager options based on the type of loft feature.
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Profiles
Profile Determines the profiles used to create a loft. Select sketch profiles,
faces, or edges to connect. Lofts are created based on the order of
profile selection.
For each profile, select the point from which you want the path of the
loft to travel.
Move Adjusts the order of the profiles. Select a Profile and adjust the
Up and Move profile order.
Down If the loft preview shows an undesirable loft, re-select or reorder the
sketches to connect different points on the profiles.
Start/End Constraints
Start Applies a constraint to control tangency to the start and end profiles. Select
constraint and End one of the following:
constraint
Default (Available with three profiles minimum). Approximates a
parabola scribed between the first and last profiles. The
tangency from this parabola drives the loft surface, which
results in a more predictable and natural loft surface when
matching conditions are not specified.

None No tangency constraint (zero curvature) is applied.

Direction Applies a tangency constraint based on a selected entity used

Vector as a direction vector. Select a Direction Vector , then set
the Draft angle and Start or End Tangent Length.

Normal to Applies a tangency constraint normal to the start or end

Profile profile. Set the Draft angle and Start or End Tangent Length.

Tangency (Available when attaching a loft to existing geometry). Makes

to Face the adjacent faces tangent at the selected start or end profile.

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 Curvature Applies a smooth, visually appealing curvature continuous
to Face loft at the selected start or end profile.
Preview of loft with no start or end constraints applied

Loft with Curvature to Face applied

Next Toggles the loft between available faces.

Face (Available
with Tangency to
Face or Curvature to
Face selected
for Start or End
constraint)
Direction Applies a tangency constraint based on a selected entity used as a direction
Vector (Available
vector. The loft is tangent to the selected linear edge or axis, or to the
with Direction
Vector selected normal of a selected face or plane. You can also select a pair of vertices to
for Start or End
set the direction vector.
constraint)

Draft Applies a draft angle to the start or end profile. If necessary, click Reverse
angle (Available
with Direction Direction . You also apply a draft angle along guide curves.
Vector or Normal to
Profile selected
for Start or End
constraint)
Start and End Controls the amount of influence on the loft. The effect of tangent length is
Tangent
limited up to the next section. If necessary, click Reverse Tangent Direction
Length (Not
available .
with None selected
for Start or End
constraint)

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 Apply to all Displays one handle that controls all the constraints for the entire profile.
Clear this option to display multiple handles that permit individual segment
control. Drag the handles to modify the tangent length.

Apply to All selected Apply to All cleared

One handle per profile controls the Multiple handles per profile
constraints for that entire profile. control the weight of the
constraints at individual
segments within each profile.

Guide Curves
Guide curves influence Controls the influence of guide curves on the loft.
Example: Two profiles and one guide curve

Select one of the following:

To Extends the guide curve influence to the next guide

next curve only.
guide

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 To Extends the guide curve influence to the next sharp
next only. A sharp is a hard corner of the profile. Any two
sharp contiguous sketch entities that do not have a common
tangent or an equal curvature relation with respect to
each other define a sharp.

To Extends the guide curve influence only to the next

next edge.
edge

Global Extends the guide curve influence to the entire loft.

Guide Curves Select guide curves to control the loft.

Move Up and Move Down Adjusts the order of the guide curves. Select a Guide

Curve and adjust the profile order.

Guide tangency type Controls the tangency where the loft meets the guide curves.
Select one of the following:

None No tangency constraint is applied.

Normal to Applies a tangency constraint normal to the plane

Profile of the guide curve. Set the Draft angle.

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 Direction Applies a tangency constraint based on a selected
Vector entity used as a direction vector. Select

a Direction Vector , then set the Draft angle.

Tangency (Available when a guide curve lies on the edge of

to Face existing geometry). Adds side tangency between
adjacent faces that lie along the path of a guide
curve, creating a smoother transition between
adjacent faces.

Direction Applies a tangency constraint based on a selected entity used as

Vector (Available a direction vector. The loft is tangent to the selected linear edge
with Direction or axis, or to the normal of a selected face or plane.
Vector selected for Guide
tangency type).

Draft angle (Available Applies a draft angle to the loft along the guide curve, whenever
with Direction geometrically possible. If necessary, click Reverse
Vector or Normal to Direction .
Profile selected
for Start or End constraint).

Centerline Parameters
Centerline Guides the loft shape using a centerline. Select a sketch in the graphics area.
Centrelines can co-exist with guide curves.

Number of Adds sections between the profile and around the centerline. Move the slider
Sections to adjust the number of sections.
Show Sections Displays the loft sections. Click the arrows to display the sections. You can
also enter a section number and click Show Sections to jump to that
section.

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Sketch Tools
Use the Selection Manager to help select sketch entities.

Drag Enables drag mode. When editing the loft feature, you can drag any 3D sketch
Sketch
segments, points, or planes from the 3D sketch from which contours have been
defined for the loft. The 3D sketch updates as you drag. You can also edit the 3D
sketch to dimension the contours using dimensioning tools. The loft preview
updates when the drag ends or when you edit the 3D sketch dimensions. To exit
drag mode, click Drag Sketch again or another selection list in the Property
Manager.

Undo Undoes the previous sketch drag and returns the preview to its previous state. You
sketch
can undo multiple drags and dimension edits.
drag

Options
Merge Causes the corresponding surfaces in the resulting loft to be tangent if the
tangent corresponding lofting segments are tangent. Faces that can be represented as a plane,
faces cylinder, or cone are maintained.

Sketch profile with preview

Loft without using Merge

tangent faces option

Loft using Merge tangent

faces option

Close loft Creates a closed body along the loft direction. This connects the last sketch and the
first sketch automatically.

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 Loft with Close loft cleared

Loft with Close loft selected

Show Displays shaded previews of the loft. Clear this option to view the path and the guide
preview curves only. You can also right-click and toggle between Transparent
Preview and Opaque Preview on the shortcut menu.

Transparent Preview

Opaque Preview

Merge Merges all the loft elements. Clear this option to not merge all the loft elements.
result
Micro Creates lofts for parts with tiny geometry. A tight tolerance accommodates parts with
tolerance small edges.
Thin Feature
Select to create a thin feature loft.

Thin feature Sets the type of thin feature loft. Select one of the following:
type
One- Creates the thin feature in one direction from the profiles using
Direction the Thickness value. If necessary, click Reverse Direction .

Mid-Plane Creates the thin feature in both directions from the profiles, applying

the same Thickness value in both directions.

Two- Creates the thin feature in both directions from the profiles. Set
Direction individual values for Thickness and Thickness

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 2.3. Rib Feature In 3D Mode:
Rib is a special type of extruded feature created from open or closed sketched contours. It adds
material of a specified thickness in a specified direction between the contour and an existing part.
You can create a rib using single or multiple sketches. You can also create rib features with draft,
or select a reference contour to draft.
To create a rib:
1. Sketch the contour to use as the rib feature on a plane that intersects the part, or is parallel
or at an angle to an existing plane.

2. Click Rib (Features toolbar) or Insert > Features > Rib.

3. Set the Property Manager options.

4. Click OK .

The Rib Property Manager appears when you create a new rib feature, or when you edit an existing
rib feature.

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To open this Property Manager:

Click Rib (Features toolbar) or Insert > Features > Rib.

The Property Manager controls the following properties:
Parameters
Some fields that accept numeric input allow you to create an equation by entering = (equal sign)
and selecting global variables, functions, and file properties from a drop-down list.
Thickness Adds thickness to the selected side of the sketch. Select one of
the following:

Adds material only to one side of the sketch.

First Side

Adds material equally to both sides of the sketch.

Both Sides

Adds material only to the other side of the sketch.

Second
Side

Rib Thickness

If you add draft, you can set the thickness at the sketch plane or
at the wall interface. Select one of the following:

1. At sketch plane
2. At wall interference

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Extrusion Direction

Sketch for rib using open sketch contours on a parallel plane.

Select one of the following:

Parallel to Creates the rib

Sketch extrusion
parallel to the
sketch.

Normal to Creates the rib

Sketch extrusion
normal to the
sketch.

Flip material side Changes the direction of the extrusion.

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Draft On/Off Adds draft to the rib. Set Draft Angle to specify the degrees for
the draft.

Draft Outward (Available Creates an outward draft angle.

when Draft On/Off is If cleared, it creates an inward

selected). draft angle.

Type

Create a sketch on a plane that is offset from the plane of the base
part.

Select one of the following:

Linear Creates a rib that extends the

sketch contours normal to the
direction of the sketch until they
meet a boundary.

Natural Creates a rib that extends the

sketch contours, continuing
with the same contour equation
until the rib meets a boundary.
For example, if the sketch is an
arc of a circle, Natural extends
the rib using the circle equation,
until it meets a boundary.

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 In this example, the rib extends
from the arc contour, using the
circle equation until it meets a
boundary, forming a circle. The
other end of the sketch extends
using a straight-line equation,
until it meets a boundary.

Selected body (Available After you create a sketch for the rib, select a body.
for multibody parts only)

Next Reference(Available Toggles through the sketch contours so you can select the one to
when you select Parallel to use as the reference contour for the draft.

Sketch for Extrusion

Direction and Draft

On/Off )

Selected Contours
Selected Contours Lists the sketch contours used to create the rib feature.

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3. 3D Sketching Practice Drawing 7:

Figure 1- 3D Practice Drawing 7

3.1. Procedure of Drawing:

Step 1:

First of all open solid works and then open a part file them select a top plane make it perpendicular
and select draw. Start sketching by drawing circles according to dimension and extrude these
circles.

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Step 2:
Now select right plane and then go to reference geometry and create 3 planes accordingly as shown
below.

Step 4:
Now select Plane 3 and make it normal and start sketching. Using construction line draw two
horizontal line and then make center line.

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Step 5:
Draw the sketch on other planes similarly as shown below.

Step 6:
By using the lofted boss base draw devolve the entity. After this using the loft cut feature and
create shell like feature. Also create a 4th plane as shown below;

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Step 7:
Now select reference 4 and begun sketching, draw two perpendicular infinite lines and keep the
distance between origin and horizontal infinite lines at given dimensions.

Step 8:
Then use the swept boss feature as shown below and used convert entities command.

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Step 9
Now select plane 4 again and select sketch and draw two circles and define their diameters. Then
draw a circle of diameter 3 and then used circular pattern command. After this used extrude boss
feature and extrude accordingly.

Step 10:
Now create a 5th plane parallel to right plane. Now select the plane 5th and draw rectangle and
extrude boss it. And then fillet the edges of radius 5mm as shown below;

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Step 11:
Now select the top plane and sketch the base by drawing circle and rectangle accordingly on it
then use extrude boss command extrude it. Again select right plane and then draw the supports as
shown in drawing then extrude these supports. Then mirror the whole base on the other side as
shown below.

Reg. No. Lab Performance (10) Lab Report (10) Viva Voce (10) Signature

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