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Transcript
00:02
Designed for drafted applications.
00:05
After completing this video,
00:07
you'll be able to
00:08
identify the various types of draft required manufacturing,
00:11
use fusion inspection tools to validate a model,
00:14
and understand the principles of drafted
00:16
manufacturing and specific design requirements.
00:22
In Fusion,
00:22
we're going to get started with two supplied data sets,
00:25
FFF quadcopter arm and drafted quadcopterAM.
00:29
When we think about drafted manufacturing,
00:32
we mainly think about injection molding,
00:34
but there are many other types of molding and casting processes
00:37
that require our models to have draft or taper on the vertical walls.
00:42
So,
00:42
mainly we're gonna focus on injection molding and casting.
00:46
But it is important that you do understand that
00:48
other processes like rotor molding or blow molding,
00:51
and even things like vacuum forming and composites,
00:54
all will require or benefit from having tapered walls
00:57
in the direction of pull from the mold.
01:00
So,
01:00
first,
01:01
what is taper and what is this draft that we're talking about?
01:04
Well,
01:05
when we think about the FFF quadcopter arm that's designed for 3D printing,
01:10
Though vertical walls are all completely vertical,
01:13
meaning that they are going straight up and down
01:15
off the build platform on our 3D printer.
01:18
This also means that they could be manufactured with CNC
01:21
milling using a 2.5 or 3 axis process fairly easily.
01:25
When we think about a drafted application of the same part,
01:29
this means that the vertical walls are all tapered.
01:32
And this is because,
01:34
as we manufacture this part by injecting
01:37
liquid plastic
01:38
and allowing it to cool inside the mold,
01:41
the tapered sections allow it to be automatically ejected,
01:44
or rather ease in that ejection process,
01:47
that way it doesn't get stuck inside of the mold cavity.
01:52
So in some cases you may find that you can get away with very little amount of draft,
01:57
but in many cases you'll need at least 1 to 3
02:01
degrees of draft on the external faces of your part,
02:03
and if you do require something like a textured appearance,
02:07
you may need to go up to 5 degrees or more,
02:09
depending on the overall size of your part and the depth of the external walls.
02:14
So when we think about injection molding,
02:16
that's the first thing that should come to mind is that we need to keep in mind
02:20
that we will have a draft requirement.
02:22
This means that any external features,
02:24
things like the vertical walls,
02:26
but also any internal features like pockets or cavities or even screw holes,
02:31
all need to have a certain amount of draft.
02:34
Depending on the manufacturing method and the company
02:36
that you're working with to manufacture parts,
02:38
they may have separate requirements for things like
02:41
rounded corners on certain areas of your design.
02:44
They may also ask you to make adjustments to your design
02:47
based on the requirements for things like ejector pins
02:50
that help push the part out of the mold.
02:52
Keep in mind that these are all going to be general guidelines,
02:56
and working with the manufacturer is going to
02:58
be an important step in that design process.
03:00
Now,
03:01
in addition to the requirements of draft,
03:03
we also need to keep in mind a consistent wall thickness.
03:06
Now there are areas of this design that are thicker than others.
03:10
So for example,
03:11
we've got a thin wall section right here between this area
03:14
and then around the screw boss,
03:15
you can see that there is a larger amount of plastic material.
03:19
This means that as we work with this design,
03:21
we may have a manufacturer ask us to do a recess or a pocket in this area
03:26
to reduce the amount of material.
03:28
The main reason for this is as plastic cools,
03:30
it begins to shrink.
03:32
If we have mostly a thin section,
03:35
let's say that's 1 millimeter or 2,
03:37
and then we have a larger area where we may have 4 or 5 millimeters,
03:41
this means that the outside skin of the part is
03:43
going to cool or solidify faster than the inside section.
03:47
And this calls what we refer to as a sink.
03:50
This means that the plastic is going to start shrinking internally,
03:53
and it's going to pull that external shaping.
03:56
This can cause deformations in your part,
03:58
making it unusable,
03:59
or simply cause
04:01
deformations that are cosmetic in nature,
04:03
making the part less desirable.
04:06
So when we think about this,
04:07
we also need to keep in mind that
04:09
many of these same guidelines are true for things like casting.
04:13
When we're talking about casting or injection molding,
04:16
we always need to focus on those draft angles,
04:19
but again,
04:19
the requirements for consistent wall thickness and
04:22
specifically when we're thinking about casting,
04:25
the,
04:25
the need to ensure that we don't have sharp corners in
04:28
our parts are going to be important requirements in our design.
04:32
Oftentimes when we work with manufacturers,
04:34
we'll have a first round reviewing our parts and then we'll get
04:38
information or feedback on things that need to be adjusted or changed.
04:42
When we think about those adjustments or feedbacks or just the designs in general,
04:46
we do have some tools in fusion to help us
04:48
identify those areas before we send them out for manufacture.
04:52
So for example,
04:52
in our inspection,
04:54
we've got measure,
04:55
we can look at just general size and shape of our part,
04:58
but we also have a draft analysis.
05:00
The draft analysis is a great tool to help
05:02
us identify draft angle requirements on our part.
05:06
For example,
05:06
we can select the body.
05:09
We can select the pull direction,
05:11
so this is going to be the direction it'll be removed from our mold.
05:14
And as we look at this,
05:15
you can also see that we're identifying different colors.
05:19
If we change the pole direction,
05:21
for example,
05:21
if we put the pole direction up here,
05:23
you can see now the bottom is blue
05:25
and the top is green.
05:27
If we select the bottom face,
05:29
it's going to adjust the direction which we're pulling from.
05:33
We also need to think about the draft angle requirements
05:35
and whether or not we need a tolerance zone.
05:38
For now,
05:38
I'm going to disable the tolerance zone,
05:40
and I'm going to change the draft requirements to be -1 degree to positive 1 degree,
05:46
because I know that's the draft that's on this part.
05:48
You can see here now that the external section of our part,
05:51
as well as all these internal pockets,
05:53
is in green.
05:54
As we rotate it around,
05:55
the bottom side is in blue.
05:57
This is because it can't be manufactured from that pole direction.
06:01
It's on the bottom of our part.
06:03
Now that doesn't mean that the part itself can't be manufactured,
06:06
it just means that the draft or the taper is in a different direction.
06:10
If we add it in our tolerance zone,
06:12
you'll notice that the top is still green,
06:14
the bottom is still blue,
06:16
but all of the inside sections are yellow.
06:19
There are some areas where corners are still green,
06:21
and you'll notice as we zoom in,
06:23
There are several areas where it starts to transition to yellow,
06:26
and what this is telling me is that
06:28
these areas that are green are still well within our draft requirements.
06:33
The areas that are yellow are falling into that tolerance zone.
06:36
This means that they may be around the 1.5 degree mark.
06:40
So if our draft requirements have this tolerance zone that
06:43
we can float above or below those draft requirements,
06:46
having the tolerance zone turned on can be very helpful.
06:49
In most cases,
06:50
you'll likely find that turning this off and
06:52
using the firm numbers for a draft angle,
06:54
in this case,
06:58
is going to be a better indicator on whether or not the part can be manufactured.
07:02
If we change these requirements to be plus and minus 1.5 degrees,
07:06
you can now see that the areas are red,
07:08
are going to not have enough draft to meet those requirements.
07:12
So using this tool can be extremely handy and helpful
07:15
to ensure that you've done all the appropriate design work
07:18
before you send this out for quote and manufacture.
07:22
So as you prepare for the certification,
07:25
it's a good idea to have a basic level of understanding on
07:28
just general idea on which drafted applications exist,
07:32
things like injection molding,
07:34
casting,
07:35
and some of the other basic molding processes like
07:38
blow molding and roto molding.
07:39
You won't need to know specifics about them,
07:42
but you will need to understand
07:43
that there are different types of manufacturing methods aside
07:46
from things like 3D printing and CNC machining.
07:49
That do require your designs to have a different design approach,
07:53
specifically with draft angle.
07:55
You'll also want a basic understanding on design rules.
07:58
You won't need to know all design rules,
07:60
but
08:00
basics such as consistent wall thickness,
08:03
draft angle,
08:04
and whether or not your specific parts,
08:07
for example,
08:08
casting,
08:09
would be better off with rounded corners as opposed to square corners.
08:13
So,
08:14
look into those design rules,
08:15
make sure that you have a basic understanding around
08:18
those sand casting and basic injection molding rules
08:22
before you go in and take the certification.
08:24
Now,
08:24
after you're done,
08:25
make sure you move on to the next step.
Video transcript
00:02
Designed for drafted applications.
00:05
After completing this video,
00:07
you'll be able to
00:08
identify the various types of draft required manufacturing,
00:11
use fusion inspection tools to validate a model,
00:14
and understand the principles of drafted
00:16
manufacturing and specific design requirements.
00:22
In Fusion,
00:22
we're going to get started with two supplied data sets,
00:25
FFF quadcopter arm and drafted quadcopterAM.
00:29
When we think about drafted manufacturing,
00:32
we mainly think about injection molding,
00:34
but there are many other types of molding and casting processes
00:37
that require our models to have draft or taper on the vertical walls.
00:42
So,
00:42
mainly we're gonna focus on injection molding and casting.
00:46
But it is important that you do understand that
00:48
other processes like rotor molding or blow molding,
00:51
and even things like vacuum forming and composites,
00:54
all will require or benefit from having tapered walls
00:57
in the direction of pull from the mold.
01:00
So,
01:00
first,
01:01
what is taper and what is this draft that we're talking about?
01:04
Well,
01:05
when we think about the FFF quadcopter arm that's designed for 3D printing,
01:10
Though vertical walls are all completely vertical,
01:13
meaning that they are going straight up and down
01:15
off the build platform on our 3D printer.
01:18
This also means that they could be manufactured with CNC
01:21
milling using a 2.5 or 3 axis process fairly easily.
01:25
When we think about a drafted application of the same part,
01:29
this means that the vertical walls are all tapered.
01:32
And this is because,
01:34
as we manufacture this part by injecting
01:37
liquid plastic
01:38
and allowing it to cool inside the mold,
01:41
the tapered sections allow it to be automatically ejected,
01:44
or rather ease in that ejection process,
01:47
that way it doesn't get stuck inside of the mold cavity.
01:52
So in some cases you may find that you can get away with very little amount of draft,
01:57
but in many cases you'll need at least 1 to 3
02:01
degrees of draft on the external faces of your part,
02:03
and if you do require something like a textured appearance,
02:07
you may need to go up to 5 degrees or more,
02:09
depending on the overall size of your part and the depth of the external walls.
02:14
So when we think about injection molding,
02:16
that's the first thing that should come to mind is that we need to keep in mind
02:20
that we will have a draft requirement.
02:22
This means that any external features,
02:24
things like the vertical walls,
02:26
but also any internal features like pockets or cavities or even screw holes,
02:31
all need to have a certain amount of draft.
02:34
Depending on the manufacturing method and the company
02:36
that you're working with to manufacture parts,
02:38
they may have separate requirements for things like
02:41
rounded corners on certain areas of your design.
02:44
They may also ask you to make adjustments to your design
02:47
based on the requirements for things like ejector pins
02:50
that help push the part out of the mold.
02:52
Keep in mind that these are all going to be general guidelines,
02:56
and working with the manufacturer is going to
02:58
be an important step in that design process.
03:00
Now,
03:01
in addition to the requirements of draft,
03:03
we also need to keep in mind a consistent wall thickness.
03:06
Now there are areas of this design that are thicker than others.
03:10
So for example,
03:11
we've got a thin wall section right here between this area
03:14
and then around the screw boss,
03:15
you can see that there is a larger amount of plastic material.
03:19
This means that as we work with this design,
03:21
we may have a manufacturer ask us to do a recess or a pocket in this area
03:26
to reduce the amount of material.
03:28
The main reason for this is as plastic cools,
03:30
it begins to shrink.
03:32
If we have mostly a thin section,
03:35
let's say that's 1 millimeter or 2,
03:37
and then we have a larger area where we may have 4 or 5 millimeters,
03:41
this means that the outside skin of the part is
03:43
going to cool or solidify faster than the inside section.
03:47
And this calls what we refer to as a sink.
03:50
This means that the plastic is going to start shrinking internally,
03:53
and it's going to pull that external shaping.
03:56
This can cause deformations in your part,
03:58
making it unusable,
03:59
or simply cause
04:01
deformations that are cosmetic in nature,
04:03
making the part less desirable.
04:06
So when we think about this,
04:07
we also need to keep in mind that
04:09
many of these same guidelines are true for things like casting.
04:13
When we're talking about casting or injection molding,
04:16
we always need to focus on those draft angles,
04:19
but again,
04:19
the requirements for consistent wall thickness and
04:22
specifically when we're thinking about casting,
04:25
the,
04:25
the need to ensure that we don't have sharp corners in
04:28
our parts are going to be important requirements in our design.
04:32
Oftentimes when we work with manufacturers,
04:34
we'll have a first round reviewing our parts and then we'll get
04:38
information or feedback on things that need to be adjusted or changed.
04:42
When we think about those adjustments or feedbacks or just the designs in general,
04:46
we do have some tools in fusion to help us
04:48
identify those areas before we send them out for manufacture.
04:52
So for example,
04:52
in our inspection,
04:54
we've got measure,
04:55
we can look at just general size and shape of our part,
04:58
but we also have a draft analysis.
05:00
The draft analysis is a great tool to help
05:02
us identify draft angle requirements on our part.
05:06
For example,
05:06
we can select the body.
05:09
We can select the pull direction,
05:11
so this is going to be the direction it'll be removed from our mold.
05:14
And as we look at this,
05:15
you can also see that we're identifying different colors.
05:19
If we change the pole direction,
05:21
for example,
05:21
if we put the pole direction up here,
05:23
you can see now the bottom is blue
05:25
and the top is green.
05:27
If we select the bottom face,
05:29
it's going to adjust the direction which we're pulling from.
05:33
We also need to think about the draft angle requirements
05:35
and whether or not we need a tolerance zone.
05:38
For now,
05:38
I'm going to disable the tolerance zone,
05:40
and I'm going to change the draft requirements to be -1 degree to positive 1 degree,
05:46
because I know that's the draft that's on this part.
05:48
You can see here now that the external section of our part,
05:51
as well as all these internal pockets,
05:53
is in green.
05:54
As we rotate it around,
05:55
the bottom side is in blue.
05:57
This is because it can't be manufactured from that pole direction.
06:01
It's on the bottom of our part.
06:03
Now that doesn't mean that the part itself can't be manufactured,
06:06
it just means that the draft or the taper is in a different direction.
06:10
If we add it in our tolerance zone,
06:12
you'll notice that the top is still green,
06:14
the bottom is still blue,
06:16
but all of the inside sections are yellow.
06:19
There are some areas where corners are still green,
06:21
and you'll notice as we zoom in,
06:23
There are several areas where it starts to transition to yellow,
06:26
and what this is telling me is that
06:28
these areas that are green are still well within our draft requirements.
06:33
The areas that are yellow are falling into that tolerance zone.
06:36
This means that they may be around the 1.5 degree mark.
06:40
So if our draft requirements have this tolerance zone that
06:43
we can float above or below those draft requirements,
06:46
having the tolerance zone turned on can be very helpful.
06:49
In most cases,
06:50
you'll likely find that turning this off and
06:52
using the firm numbers for a draft angle,
06:54
in this case,
06:58
is going to be a better indicator on whether or not the part can be manufactured.
07:02
If we change these requirements to be plus and minus 1.5 degrees,
07:06
you can now see that the areas are red,
07:08
are going to not have enough draft to meet those requirements.
07:12
So using this tool can be extremely handy and helpful
07:15
to ensure that you've done all the appropriate design work
07:18
before you send this out for quote and manufacture.
07:22
So as you prepare for the certification,
07:25
it's a good idea to have a basic level of understanding on
07:28
just general idea on which drafted applications exist,
07:32
things like injection molding,
07:34
casting,
07:35
and some of the other basic molding processes like
07:38
blow molding and roto molding.
07:39
You won't need to know specifics about them,
07:42
but you will need to understand
07:43
that there are different types of manufacturing methods aside
07:46
from things like 3D printing and CNC machining.
07:49
That do require your designs to have a different design approach,
07:53
specifically with draft angle.
07:55
You'll also want a basic understanding on design rules.
07:58
You won't need to know all design rules,
07:60
but
08:00
basics such as consistent wall thickness,
08:03
draft angle,
08:04
and whether or not your specific parts,
08:07
for example,
08:08
casting,
08:09
would be better off with rounded corners as opposed to square corners.
08:13
So,
08:14
look into those design rules,
08:15
make sure that you have a basic understanding around
08:18
those sand casting and basic injection molding rules
08:22
before you go in and take the certification.
08:24
Now,
08:24
after you're done,
08:25
make sure you move on to the next step.
How to buy
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