& Construction
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Professional CAD/CAM tools built on Inventor and AutoCAD
Transcript
00:00
Inspect OP two.
00:02
After completing this video, you will be able to
00:05
visually inspect a part,
00:07
use common hand tools for inspection.
00:10
Better understand how clamping can affect a parts dimension. Our
00:15
part looks fantastic, looks great, nice surface finishes
00:20
and looking at the Cher,
00:22
there are no rolled edges, no birds.
00:24
So we know that our champer tool is nice and sharp.
00:28
The only features we cut in this second operation are the face
00:32
which establish our overall height.
00:34
And
00:35
our Cher
00:36
our overall height is supposed to be 0.63 inches.
00:40
Now there is no tolerance on this dimension.
00:43
So we look to our block tolerance
00:45
two digits past the decimal place. So our tolerance
00:49
is plus or minus 0.02 inches. Now,
00:53
this is well within the accuracy range of a good set of calipers.
00:56
So that is what we will be using to measure these parts.
01:01
I'll wipe the jaws on the calipers,
01:03
close them all the way no light can be seen between the caliper jaws.
01:07
So we know that they are fully closed and flush.
01:10
We will rezero our calipers by pressing and holding the zero button
01:14
and can then measure our part 0.628 inches.
01:18
Now, this falls well within our measured tolerance of plus or minus 20 thou,
01:24
we will write this down on our inspection sheet.
01:32
This part measured good. We're gonna pass it.
01:35
But what if it measured out of tolerance out of spec?
01:38
Well, at that point, we would go to our control
01:41
and make a change to our tool or our work offset,
01:45
we will go ahead and make an offset correction.
01:47
So our next part is even closer to our 0.63 inch nominal value.
01:53
Again, to be clear,
01:55
the height of this part measures 0.6 to eight inches. It's good.
01:60
We don't have to make an adjustment.
02:02
Uh We're doing this because we need to show you how to adjust tool and work offsets.
02:07
And it's always a good idea to stay right in the middle of our tolerance range,
02:11
right on nominal.
02:13
Our part is two thou two short
02:19
Now, this face
02:20
was machined with tool seven,
02:23
our half inch and mill. Now, we need to bring this face up
02:27
by two thou
02:29
and we have a couple ways to accomplish this
02:31
one. We could bring up our T seven
02:35
adjusting our T seven length wear by plus 2007 inch. That's on the tool offset page.
02:41
The next time we run this part, it should measure 0.63 inches tall
02:46
instead
02:47
of 0.628.
02:49
Another method to adjust this face. The overall height of our part
02:54
is to change our G 54 work offset instead of our tool offset.
02:59
Why would we do that?
03:01
Well, if we adjust our G 54 and we bring that up, it brings all of our tools,
03:07
both of our tools in this case
03:09
up together. If we bring our G 54 work offset down,
03:13
it brings both of our tools down. So everything is moving up or down together
03:18
with our G 54 work offset.
03:20
This might sound like a small distinction, but there are big ramifications to this
03:25
changing a tool offset versus a work offset
03:28
later on in the future.
03:29
When we've got two vices on a table each with its own work offset,
03:34
adjusting a tool offset will affect
03:37
every work offset, every operation that that tool touches.
03:41
So if we brought up our, our tool seven,
03:44
it would bring that tool up on both
03:46
G 54 and G 55.
03:49
That could be a problem
03:50
making a change to a tool affects everything that tool touches.
03:55
Making a change to a work offset
03:58
will only affect the operation that that work offset affects G 54.
04:03
Change only affects
04:04
one. A G 55 change will only affect
04:07
two. But again, we'll talk more about this in upcoming videos.
04:11
Lots to think about.
04:12
There is no one method that can be applied to every part in every situation
04:18
we got to put on our thinking caps and, and decide are we gonna adjust a tool
04:23
or a work offset?
04:25
Ok.
04:26
Onto our champ
04:33
So technically, her part is good
04:36
if we are somewhere between zero
04:38
and 40 thou wide,
04:40
using a loop in our calipers, we can see that our Cher
04:43
is just about 20 thou wide. Now, this is not a terribly accurate method,
04:48
but I can absolutely guarantee that the champ
04:50
is between zero and 40/1000 of an inch.
04:53
So I am writing down 20 thou and passing this feature.
04:57
If it were a tighter tolerance,
04:59
we could have used an optical comparator.
05:01
The comparator can also be used to verify our champ for angle of 45 degrees.
05:05
We inspected our champ for tool upon installation.
05:08
We found it to be a 45 degree, 90 degree included tool.
05:13
Well, that's it. It's the last dimension on our op two
05:17
in process inspection report. So we can just ship the part to the customer, right?
05:21
Well, not so fast.
05:22
We need to give the part a final inspection. We can call that
05:26
uh a final inspection report or a first article inspection report.
05:31
And the reason we want to go ahead and measure all these features again
05:36
is because we might have affected op one dimensions
05:40
during
05:41
two. And here's what I mean
05:43
when we held this part in our vice
05:45
and machined out the OD and the ID. During
05:48
one, we inspected it, everything was perfect,
05:51
but
05:51
we held it on those features
05:54
in the jaw
05:55
during our second operation.
05:57
And it is possible that we could have crushed that part, put too much
06:02
elbow grease on to it and deformed it.
06:04
Where if we were to take our calipers and measure the outside, rotate 90 degrees,
06:08
measure it again, we might get different numbers.
06:10
We might have turned our circle
06:12
into an oval.
06:14
And the only way that we would find this out is during a final inspection.
06:19
So check everything again, in this case, see if we've done everything properly.
06:24
And if we really do have a good part,
06:27
this is where a good machinist can shine over time.
06:31
We will gain knowledge,
06:32
letting us know how metal moves and we'll
06:35
use that knowledge to make more perfect parts.
00:00
Inspect OP two.
00:02
After completing this video, you will be able to
00:05
visually inspect a part,
00:07
use common hand tools for inspection.
00:10
Better understand how clamping can affect a parts dimension. Our
00:15
part looks fantastic, looks great, nice surface finishes
00:20
and looking at the Cher,
00:22
there are no rolled edges, no birds.
00:24
So we know that our champer tool is nice and sharp.
00:28
The only features we cut in this second operation are the face
00:32
which establish our overall height.
00:34
And
00:35
our Cher
00:36
our overall height is supposed to be 0.63 inches.
00:40
Now there is no tolerance on this dimension.
00:43
So we look to our block tolerance
00:45
two digits past the decimal place. So our tolerance
00:49
is plus or minus 0.02 inches. Now,
00:53
this is well within the accuracy range of a good set of calipers.
00:56
So that is what we will be using to measure these parts.
01:01
I'll wipe the jaws on the calipers,
01:03
close them all the way no light can be seen between the caliper jaws.
01:07
So we know that they are fully closed and flush.
01:10
We will rezero our calipers by pressing and holding the zero button
01:14
and can then measure our part 0.628 inches.
01:18
Now, this falls well within our measured tolerance of plus or minus 20 thou,
01:24
we will write this down on our inspection sheet.
01:32
This part measured good. We're gonna pass it.
01:35
But what if it measured out of tolerance out of spec?
01:38
Well, at that point, we would go to our control
01:41
and make a change to our tool or our work offset,
01:45
we will go ahead and make an offset correction.
01:47
So our next part is even closer to our 0.63 inch nominal value.
01:53
Again, to be clear,
01:55
the height of this part measures 0.6 to eight inches. It's good.
01:60
We don't have to make an adjustment.
02:02
Uh We're doing this because we need to show you how to adjust tool and work offsets.
02:07
And it's always a good idea to stay right in the middle of our tolerance range,
02:11
right on nominal.
02:13
Our part is two thou two short
02:19
Now, this face
02:20
was machined with tool seven,
02:23
our half inch and mill. Now, we need to bring this face up
02:27
by two thou
02:29
and we have a couple ways to accomplish this
02:31
one. We could bring up our T seven
02:35
adjusting our T seven length wear by plus 2007 inch. That's on the tool offset page.
02:41
The next time we run this part, it should measure 0.63 inches tall
02:46
instead
02:47
of 0.628.
02:49
Another method to adjust this face. The overall height of our part
02:54
is to change our G 54 work offset instead of our tool offset.
02:59
Why would we do that?
03:01
Well, if we adjust our G 54 and we bring that up, it brings all of our tools,
03:07
both of our tools in this case
03:09
up together. If we bring our G 54 work offset down,
03:13
it brings both of our tools down. So everything is moving up or down together
03:18
with our G 54 work offset.
03:20
This might sound like a small distinction, but there are big ramifications to this
03:25
changing a tool offset versus a work offset
03:28
later on in the future.
03:29
When we've got two vices on a table each with its own work offset,
03:34
adjusting a tool offset will affect
03:37
every work offset, every operation that that tool touches.
03:41
So if we brought up our, our tool seven,
03:44
it would bring that tool up on both
03:46
G 54 and G 55.
03:49
That could be a problem
03:50
making a change to a tool affects everything that tool touches.
03:55
Making a change to a work offset
03:58
will only affect the operation that that work offset affects G 54.
04:03
Change only affects
04:04
one. A G 55 change will only affect
04:07
two. But again, we'll talk more about this in upcoming videos.
04:11
Lots to think about.
04:12
There is no one method that can be applied to every part in every situation
04:18
we got to put on our thinking caps and, and decide are we gonna adjust a tool
04:23
or a work offset?
04:25
Ok.
04:26
Onto our champ
04:33
So technically, her part is good
04:36
if we are somewhere between zero
04:38
and 40 thou wide,
04:40
using a loop in our calipers, we can see that our Cher
04:43
is just about 20 thou wide. Now, this is not a terribly accurate method,
04:48
but I can absolutely guarantee that the champ
04:50
is between zero and 40/1000 of an inch.
04:53
So I am writing down 20 thou and passing this feature.
04:57
If it were a tighter tolerance,
04:59
we could have used an optical comparator.
05:01
The comparator can also be used to verify our champ for angle of 45 degrees.
05:05
We inspected our champ for tool upon installation.
05:08
We found it to be a 45 degree, 90 degree included tool.
05:13
Well, that's it. It's the last dimension on our op two
05:17
in process inspection report. So we can just ship the part to the customer, right?
05:21
Well, not so fast.
05:22
We need to give the part a final inspection. We can call that
05:26
uh a final inspection report or a first article inspection report.
05:31
And the reason we want to go ahead and measure all these features again
05:36
is because we might have affected op one dimensions
05:40
during
05:41
two. And here's what I mean
05:43
when we held this part in our vice
05:45
and machined out the OD and the ID. During
05:48
one, we inspected it, everything was perfect,
05:51
but
05:51
we held it on those features
05:54
in the jaw
05:55
during our second operation.
05:57
And it is possible that we could have crushed that part, put too much
06:02
elbow grease on to it and deformed it.
06:04
Where if we were to take our calipers and measure the outside, rotate 90 degrees,
06:08
measure it again, we might get different numbers.
06:10
We might have turned our circle
06:12
into an oval.
06:14
And the only way that we would find this out is during a final inspection.
06:19
So check everything again, in this case, see if we've done everything properly.
06:24
And if we really do have a good part,
06:27
this is where a good machinist can shine over time.
06:31
We will gain knowledge,
06:32
letting us know how metal moves and we'll
06:35
use that knowledge to make more perfect parts.
After completing this video, you'll be able to: