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Practice exercise

In this practice, you’ll create 2D Contour, 2D Pocket, and 2D Adaptive Clearing toolpaths for open and closed pockets.

Analyze toolpath selection for an open pocket.
Analyze toolpath selection for a closed pocket.

Exercise

Any referenced datasets can be downloaded from "Module downloads" in the module overview.

Transcript

00:00

This is a practice exercise video solution.

00:04

When we're looking at detailed drawings,

00:06

whenever we're planning to machine apart,

00:08

it's always important to focus on the details of the dimensions and tolerances.

00:12

For this example, we're gonna navigate to page five for the piston.

00:16

Now,

00:17

one of the problems that we have here is we've got a detailed

00:20

drawing with provided dimensions 0.63 for the depth of the piston on the outside

00:25

and 0.55 for the depth of the piston on the inside.

00:29

Now, when this part is modeled, that gives it a consistent wall thickness,

00:33

but the problem comes in when we start to introduce tolerances.

00:37

Now, tolerances unless otherwise specified,

00:40

such as the OD of the piston itself are often found in the title block.

00:45

In this instance,

00:46

anything that has two decimal places is subject to a 0.05 inch tolerance.

00:52

This means that the outside values can be plus 0.05

00:58

and the inside or minimum values can be minus 0.05.

01:02

When we take a look at a detailed part like this,

01:04

that has a consistent wall thickness that's relatively thin

01:08

when we start to factor in those tolerance values, we start to get into problems.

01:13

So whenever you're reviewing a detailed drawing,

01:15

make sure that you take a look at the details.

01:17

And if there are no additional tolerance values,

01:19

get a calculator out and take a look at the values that we have on the screen.

01:23

For example,

01:24

the inside depth of 0.55 if this had the additional tolerance

01:28

value of plus 0.05 putting it at its maximum tolerance value,

01:34

that would give us an inside depth of 0.60.

01:39

Now,

01:39

if we factor in the outside being 0.63 and if

01:43

it was at its nominal or its middle value there,

01:46

that means that it would be a very thin wall on the bottom of the part.

01:50

However, if we were to factor in the negative tolerance value of minus 0.05

01:56

that leaves the outside at 0.58

02:00

now

02:05

we're left with a ring and not an actual piston part.

02:08

So this means that the tolerances included on the T block

02:12

are likely going to be too loose for this specific part.

02:16

If this happens to you,

02:17

it's always important to go back to whoever provided the drawing

02:21

and get clarification on the dimensions and the tolerances required.

02:25

It's important to ensure that these dimensions and

02:27

tolerances get sorted out before parts are manufactured.

02:31

It's possible that you could machine dozens,

02:33

if not hundreds of these parts and still be

02:35

well within tolerance value and not have a problem.

02:38

But there may be a couple instances that reach the min

02:40

and max values that are just parts that cannot be used.

02:44

So make sure that you pay close attention to your detailed drawings and take

02:47

a look at ours to see if you can find any other issues.

02:50

Some of these will be sorted in a final detailed drawing

02:53

package that's provided at the end of all the courses.

02:56

But you can pay close attention and see if you can pick up any more.

Video transcript

00:00

This is a practice exercise video solution.

00:04

When we're looking at detailed drawings,

00:06

whenever we're planning to machine apart,

00:08

it's always important to focus on the details of the dimensions and tolerances.

00:12

For this example, we're gonna navigate to page five for the piston.

00:16

Now,

00:17

one of the problems that we have here is we've got a detailed

00:20

drawing with provided dimensions 0.63 for the depth of the piston on the outside

00:25

and 0.55 for the depth of the piston on the inside.

00:29

Now, when this part is modeled, that gives it a consistent wall thickness,

00:33

but the problem comes in when we start to introduce tolerances.

00:37

Now, tolerances unless otherwise specified,

00:40

such as the OD of the piston itself are often found in the title block.

00:45

In this instance,

00:46

anything that has two decimal places is subject to a 0.05 inch tolerance.

00:52

This means that the outside values can be plus 0.05

00:58

and the inside or minimum values can be minus 0.05.

01:02

When we take a look at a detailed part like this,

01:04

that has a consistent wall thickness that's relatively thin

01:08

when we start to factor in those tolerance values, we start to get into problems.

01:13

So whenever you're reviewing a detailed drawing,

01:15

make sure that you take a look at the details.

01:17

And if there are no additional tolerance values,

01:19

get a calculator out and take a look at the values that we have on the screen.

01:23

For example,

01:24

the inside depth of 0.55 if this had the additional tolerance

01:28

value of plus 0.05 putting it at its maximum tolerance value,

01:34

that would give us an inside depth of 0.60.

01:39

Now,

01:39

if we factor in the outside being 0.63 and if

01:43

it was at its nominal or its middle value there,

01:46

that means that it would be a very thin wall on the bottom of the part.

01:50

However, if we were to factor in the negative tolerance value of minus 0.05

01:56

that leaves the outside at 0.58

02:00

now

02:05

we're left with a ring and not an actual piston part.

02:08

So this means that the tolerances included on the T block

02:12

are likely going to be too loose for this specific part.

02:16

If this happens to you,

02:17

it's always important to go back to whoever provided the drawing

02:21

and get clarification on the dimensions and the tolerances required.

02:25

It's important to ensure that these dimensions and

02:27

tolerances get sorted out before parts are manufactured.

02:31

It's possible that you could machine dozens,

02:33

if not hundreds of these parts and still be

02:35

well within tolerance value and not have a problem.

02:38

But there may be a couple instances that reach the min

02:40

and max values that are just parts that cannot be used.

02:44

So make sure that you pay close attention to your detailed drawings and take

02:47

a look at ours to see if you can find any other issues.

02:50

Some of these will be sorted in a final detailed drawing

02:53

package that's provided at the end of all the courses.

02:56

But you can pay close attention and see if you can pick up any more.

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