How to modify sketch entities

00:02

How to modify sketch entities?

00:05

After completing this video,

00:06

you'll be able to

00:07

use offset,

00:09

create a filet,

00:10

create a champfer,

00:11

and trim a sketch entity.

00:14

In Fusion,

00:15

we want to get started with a new untitled document.

00:18

We're going to begin by first creating a sketch and selecting the front plane.

00:22

We're going to begin by using a 2 point rectangle,

00:25

selecting the center rectangle option from the sketch palette,

00:28

and placing it at the origin.

00:31

We're gonna manually enter a value of 150 millimeters,

00:34

hit the tab key,

00:36

and enter a value of 75,

00:38

and then enter on the keyboard.

00:40

This will allow us to create a fully defined sketch rectangle.

00:44

When we're creating sketches,

00:45

oftentimes the creation is only a part of that process.

00:49

We also have access to modification tools,

00:51

things like adding filets or champers,

00:53

as well as offsetting or trimming sketch entities.

00:57

To take a look at how this works,

00:58

let's go ahead and use our line tool,

01:01

and we're going to go up,

01:03

over

01:04

and back down

01:05

before finally hitting the escape key.

01:08

When we have a sketch profile,

01:10

these profiles are used downstream to create solid

01:13

geometry for things like extrudes and revolves.

01:16

But oftentimes we want to simplify our

01:18

sketches by creating a single sketch profile.

01:21

In this case,

01:22

we would have to make two selections before

01:24

using this profile for something like an extrude.

01:27

And while this is a simplified case,

01:29

as our sketches become more complex,

01:31

it becomes harder and harder to make sure that we select all the correct geometry.

01:35

Because of this,

01:36

we may find the need to use tools like trim or extend.

01:39

The trim extend and break tools all will

01:42

modify specific areas of our sketch entities.

01:45

For example,

01:46

if we use the brake tool,

01:48

we can select a specific area that we want to break a sketch line.

01:52

We can see a red X on the screen,

01:53

and if we click here,

01:55

what we're able to do is break this up into two different lines.

01:59

If we use our trim tool,

02:00

the trim tool will allow us to use the

02:02

intersection of sketch entities to remove other sketch entities.

02:06

In this case,

02:07

let's go ahead and hit escape to get off the trim tool.

02:11

The extend tool will allow us to take a sketch

02:13

entity and extend it out to its next intersection.

02:17

So these tools in conjunction with several others will allow us to create

02:21

complex profiles by building overlapping sections and

02:24

then modifying them after the fact.

02:27

Let's go ahead and hit escape.

02:29

Next,

02:30

we want to take a look at some of the modification tools like filets and champers.

02:34

A filet will allow us to select a corner

02:36

and round it off by removing the sharp point and adding a tangent arc.

02:42

Let's go ahead and right click,

02:43

select OK to accept that.

02:45

The Chamer tool,

02:46

on the other hand,

02:47

allows us to break the corner by having a reduced angle.

02:51

In this case,

02:52

instead of having 90 degrees at this corner,

02:54

we can add a chamfer and have 45 degrees at this corner.

02:59

In most cases,

02:60

what we'll want to do is add filets and champers to our solid model geometry,

03:04

rather than adding them at the sketch level,

03:06

but we do still have access to these tools.

03:09

Keep in mind,

03:10

in some cases you'll see warnings whenever you're adding,

03:13

breaking,

03:14

or removing geometry like a center point rectangle.

03:18

Because sketch geometry has constraints applied to it by default.

03:22

In some cases,

03:23

when we begin to modify them,

03:24

we get warnings from Fusion telling us that we've broken some constraints.

03:29

In most cases,

03:29

we simply need to go back and add

03:31

dimensions or constraints to fully define our sketches.

03:35

Let's also take a look at another tool,

03:37

offset.

03:38

The offset tool allows us to select curves

03:41

and then create an offset variation of that.

03:45

In the case of geometry such as a filet,

03:48

as we get inward of its value,

03:51

so in this case,

03:51

a 15 millimeter radius,

03:53

as soon as we cross 15 millimeters,

03:56

that entire arc is going to be removed and a square or sharp corner will be added.

04:01

As we go the other direction,

04:03

that filet will get larger and larger

04:05

until this short straight section is going to disappear.

04:09

Fusion is able to heal and modify this geometry on the fly,

04:13

but there is also an option called match topology.

04:17

Match topology will allow us to go up to

04:19

the point that we get to remove sketch entities.

04:23

So for example,

04:23

on the inward,

04:24

as soon as that arc is going to disappear and a sharp corner is added,

04:28

we'll have an error telling us that we have gone past that match topology.

04:32

So this can be a very helpful feature.

04:35

We can also do this as a two-sided feature,

04:37

meaning we're adding an offset on the inside and the outside.

04:41

Let's go ahead and say,

04:42

OK,

04:43

we're going to double click this inside original curve and

04:46

we're going to use the line type option construction.

04:49

This means that we've now got this closed profile that we can

04:52

select for our future features such as an extrude or a revolve.

04:56

In many cases,

04:57

using modification tools such as trim,

04:59

break,

04:60

or extend can simplify the way in which you build out your original sketches.

05:05

So make sure that you do play around with not only the creation tools,

05:07

but the modification tools that you have available.

05:10

And once you're done,

05:11

go ahead and finish your sketch,

05:13

and then we can move on to the next step.

Video transcript

00:02

How to modify sketch entities?

00:05

After completing this video,

00:06

you'll be able to

00:07

use offset,

00:09

create a filet,

00:10

create a champfer,

00:11

and trim a sketch entity.

00:14

In Fusion,

00:15

we want to get started with a new untitled document.

00:18

We're going to begin by first creating a sketch and selecting the front plane.

00:22

We're going to begin by using a 2 point rectangle,

00:25

selecting the center rectangle option from the sketch palette,

00:28

and placing it at the origin.

00:31

We're gonna manually enter a value of 150 millimeters,

00:34

hit the tab key,

00:36

and enter a value of 75,

00:38

and then enter on the keyboard.

00:40

This will allow us to create a fully defined sketch rectangle.

00:44

When we're creating sketches,

00:45

oftentimes the creation is only a part of that process.

00:49

We also have access to modification tools,

00:51

things like adding filets or champers,

00:53

as well as offsetting or trimming sketch entities.

00:57

To take a look at how this works,

00:58

let's go ahead and use our line tool,

01:01

and we're going to go up,

01:03

over

01:04

and back down

01:05

before finally hitting the escape key.

01:08

When we have a sketch profile,

01:10

these profiles are used downstream to create solid

01:13

geometry for things like extrudes and revolves.

01:16

But oftentimes we want to simplify our

01:18

sketches by creating a single sketch profile.

01:21

In this case,

01:22

we would have to make two selections before

01:24

using this profile for something like an extrude.

01:27

And while this is a simplified case,

01:29

as our sketches become more complex,

01:31

it becomes harder and harder to make sure that we select all the correct geometry.

01:35

Because of this,

01:36

we may find the need to use tools like trim or extend.

01:39

The trim extend and break tools all will

01:42

modify specific areas of our sketch entities.

01:45

For example,

01:46

if we use the brake tool,

01:48

we can select a specific area that we want to break a sketch line.

01:52

We can see a red X on the screen,

01:53

and if we click here,

01:55

what we're able to do is break this up into two different lines.

01:59

If we use our trim tool,

02:00

the trim tool will allow us to use the

02:02

intersection of sketch entities to remove other sketch entities.

02:06

In this case,

02:07

let's go ahead and hit escape to get off the trim tool.

02:11

The extend tool will allow us to take a sketch

02:13

entity and extend it out to its next intersection.

02:17

So these tools in conjunction with several others will allow us to create

02:21

complex profiles by building overlapping sections and

02:24

then modifying them after the fact.

02:27

Let's go ahead and hit escape.

02:29

Next,

02:30

we want to take a look at some of the modification tools like filets and champers.

02:34

A filet will allow us to select a corner

02:36

and round it off by removing the sharp point and adding a tangent arc.

02:42

Let's go ahead and right click,

02:43

select OK to accept that.

02:45

The Chamer tool,

02:46

on the other hand,

02:47

allows us to break the corner by having a reduced angle.

02:51

In this case,

02:52

instead of having 90 degrees at this corner,

02:54

we can add a chamfer and have 45 degrees at this corner.

02:59

In most cases,

02:60

what we'll want to do is add filets and champers to our solid model geometry,

03:04

rather than adding them at the sketch level,

03:06

but we do still have access to these tools.

03:09

Keep in mind,

03:10

in some cases you'll see warnings whenever you're adding,

03:13

breaking,

03:14

or removing geometry like a center point rectangle.

03:18

Because sketch geometry has constraints applied to it by default.

03:22

In some cases,

03:23

when we begin to modify them,

03:24

we get warnings from Fusion telling us that we've broken some constraints.

03:29

In most cases,

03:29

we simply need to go back and add

03:31

dimensions or constraints to fully define our sketches.

03:35

Let's also take a look at another tool,

03:37

offset.

03:38

The offset tool allows us to select curves

03:41

and then create an offset variation of that.

03:45

In the case of geometry such as a filet,

03:48

as we get inward of its value,

03:51

so in this case,

03:51

a 15 millimeter radius,

03:53

as soon as we cross 15 millimeters,

03:56

that entire arc is going to be removed and a square or sharp corner will be added.

04:01

As we go the other direction,

04:03

that filet will get larger and larger

04:05

until this short straight section is going to disappear.

04:09

Fusion is able to heal and modify this geometry on the fly,

04:13

but there is also an option called match topology.

04:17

Match topology will allow us to go up to

04:19

the point that we get to remove sketch entities.

04:23

So for example,

04:23

on the inward,

04:24

as soon as that arc is going to disappear and a sharp corner is added,

04:28

we'll have an error telling us that we have gone past that match topology.

04:32

So this can be a very helpful feature.

04:35

We can also do this as a two-sided feature,

04:37

meaning we're adding an offset on the inside and the outside.

04:41

Let's go ahead and say,

04:42

OK,

04:43

we're going to double click this inside original curve and

04:46

we're going to use the line type option construction.

04:49

This means that we've now got this closed profile that we can

04:52

select for our future features such as an extrude or a revolve.

04:56

In many cases,

04:57

using modification tools such as trim,

04:59

break,

04:60

or extend can simplify the way in which you build out your original sketches.

05:05

So make sure that you do play around with not only the creation tools,

05:07

but the modification tools that you have available.

05:10

And once you're done,

05:11

go ahead and finish your sketch,

05:13

and then we can move on to the next step.

After completing this video, you'll be able to:

  • Use Offset.
  • Create a fillet.
  • Create a chamfer.
  • Trim a sketch entity.

Video quiz

Which sketch modify tool is used to cut a single sketch line at an intersection without removing any geometry?

(Select one)
Select an answer

1/1 questions left unanswered

Step-by-step guide

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