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Transcript
00:00
Inspect a part.
00:02
After completing this video,
00:04
you will be able to interpret basic inspection reports,
00:08
measure simple part features against a print,
00:11
adjust tool pass at the machine based on these measurements,
00:16
the basic core concepts of inspection can be understood pretty quickly
00:21
based on our measurements. A part is either good or bad.
00:25
It's either within specifications
00:27
or it's not,
00:29
this is pass or fail. So
00:31
if the part is good,
00:32
it moves on to the next operation ends up getting boxed and shipped on its way.
00:36
But what if the part is bad? What if it is out of spec?
00:41
Well,
00:42
here's where I would start,
00:44
we'll
00:45
end up with a balloon print and inspection sheet. We'll measure the part.
00:49
And if that feature is out,
00:51
we will take that value. How far out we are
00:55
enter it into our machine control
00:57
and the machine will automatically adjust itself based on our values.
01:01
So our next part
01:03
is good is with inspect.
01:05
When I create inspection reports,
01:07
I will balloon my print first leaving a number next
01:11
to each feature or value just for my reference.
01:13
Now, on my inspection sheets, we refer to these as character numbers.
01:18
This helps to make sure that we didn't miss anything and to
01:21
distinguish between multiple features that might
01:24
have the same dimensional tolerance.
01:26
Let's go ahead and start our measurements.
01:29
We're gonna start with this guy right here.
01:31
The first item on our inspection sheets.
01:34
Now, this is a 1.053 inch diameter plus or minus 5/1000 of an inch.
01:42
And it's written right here on our inspection sheet as op +1003 character number,
01:46
uh feature number.
01:47
Now,
01:48
we've grouped all of our operation one inspection
01:50
dimensions together and we're gonna measure those together.
01:53
Now,
01:54
piston OD 1.053.
02:02
So this part measures 1.053. It's good.
02:07
We're gonna write that down on our inspection sheet and move on.
02:12
But what if it didn't measure? Perfect. Let's say it measured
02:16
one inch 0 60
02:18
out of spec outside of our tolerance.
02:22
This is how we'd fix it.
02:24
We would take that dimension 1.06
02:27
subtract it from our nominal 1.053 which means
02:31
our part would be 7/1000 of an inch oversized
02:36
diameter.
02:38
We can go right to our machine and enter that value
02:41
to make a correction for next time.
02:43
A diameter wear adjustment will take more or less
02:46
material off of our parts during finish passes,
02:49
cutter compensation is another name for our diameter wear adjustment.
02:54
Um Let me grab it to hold on a second.
02:58
Uh This is easier to explain.
03:01
This is our tool.
03:02
If we put in a negative value, it's gonna bring it towards our part feature,
03:06
our part contour, making it smaller.
03:08
If we put in a positive wear compensation,
03:10
it's gonna bring it away from our part further.
03:13
So we can go towards our part
03:16
or away from our part contour
03:19
based on those diameter wear values.
03:21
Now, if we wanted to bring our tool up or down,
03:24
we would use our length wear compensations.
03:26
We can add in a value, positive value to bring our tool up
03:29
negative value to bring our tool down.
03:32
We're gonna talk a bit more about that in our next inspection video.
03:36
So we'll come back to it.
03:38
We can work our way down through our inspection sheet. And again,
03:42
the purpose of this video is not to show you how to inspect every feature.
03:47
It's to show you how these values relate to our
03:50
machine and how we can make adjustments as machinist.
03:54
We can measure our board depth, our, our 0.55 value here with a set of calipers,
04:00
make the adjustments at the machine
04:02
with our tool length offset.
04:05
We can measure that board diameter, the id of 0.9 inches.
04:10
This value uh is pretty wide open 0.9.
04:14
There's only one digit past the decimal place,
04:17
which puts it at plus or minus 50/1000 of an inch.
04:21
We're gonna go ahead and use our board gauge to measure
04:23
this because I've got it here and it's all set up.
04:26
But really with the tolerance that wide open, we could use a
04:30
set of calibers,
04:32
measuring champers can be tough for champ for angles. I usually just
04:37
measure or verify the angle of the champ tool itself.
04:42
Now, often times the included angle,
04:47
written on the website where we've bought the tool.
04:49
If the angle is critical,
04:52
we can measure the actual angle using an
04:54
optical comparator or some kind of comparative gauge.
04:57
Now, no tolerance was explicitly noted with the dimension.
05:01
So we will refer to our block tolerance that says
05:04
our angle must be within plus or minus one degree.
05:07
Our 10 thou Cher
05:09
uses a block tolerance of plus or minus 0.02 inches.
05:14
It's two digits past the decimal place. So plus or minus 0.02.
05:19
Now, I know what some of you are thinking,
05:21
would the part still be good
05:24
if it had no champ for at all?
05:27
Well, yes, technically, according to the letter of the law,
05:32
uh a
05:33
champer of zero length would fall within our plus or minus 20 thou tolerance,
05:39
but you're stretching things.
05:41
There don't be a wise guy
05:42
that's not what the designer intended. Look at the intent of the drawing.
05:48
Designers will often add notes like break all sharp
05:51
edges to make their intent as clear as possible.
05:54
If a Cher
05:55
were critical for some reason the designer would
05:57
add a more specific tolerance to the feature
05:60
with a wide open tolerance like this.
06:02
I'd be comfortable measuring the champers visually.
06:05
Uh comparing it against a set of calipers or a depth micrometer
06:10
and looking at that through a loop
06:12
using an optical comparator might be
06:14
needed to measure tighter tolerance champers.
06:17
Now, if there's any doubt at all, go talk to somebody else,
06:21
another inspector and ask them how a part should be measured or if all else fails,
06:26
give the customer a call just to make sure that we're all on the same page.
06:31
When in doubt,
06:33
ask.
06:34
Now this was not meant to be a
06:36
comprehensive video on part inspection and metrology. Metrology is a
06:41
kind of a study of inspection like this.
06:44
This is meant to be a video that shows us how part measurements
06:48
can be used to enter small changes at the control to make better parts.
Video transcript
00:00
Inspect a part.
00:02
After completing this video,
00:04
you will be able to interpret basic inspection reports,
00:08
measure simple part features against a print,
00:11
adjust tool pass at the machine based on these measurements,
00:16
the basic core concepts of inspection can be understood pretty quickly
00:21
based on our measurements. A part is either good or bad.
00:25
It's either within specifications
00:27
or it's not,
00:29
this is pass or fail. So
00:31
if the part is good,
00:32
it moves on to the next operation ends up getting boxed and shipped on its way.
00:36
But what if the part is bad? What if it is out of spec?
00:41
Well,
00:42
here's where I would start,
00:44
we'll
00:45
end up with a balloon print and inspection sheet. We'll measure the part.
00:49
And if that feature is out,
00:51
we will take that value. How far out we are
00:55
enter it into our machine control
00:57
and the machine will automatically adjust itself based on our values.
01:01
So our next part
01:03
is good is with inspect.
01:05
When I create inspection reports,
01:07
I will balloon my print first leaving a number next
01:11
to each feature or value just for my reference.
01:13
Now, on my inspection sheets, we refer to these as character numbers.
01:18
This helps to make sure that we didn't miss anything and to
01:21
distinguish between multiple features that might
01:24
have the same dimensional tolerance.
01:26
Let's go ahead and start our measurements.
01:29
We're gonna start with this guy right here.
01:31
The first item on our inspection sheets.
01:34
Now, this is a 1.053 inch diameter plus or minus 5/1000 of an inch.
01:42
And it's written right here on our inspection sheet as op +1003 character number,
01:46
uh feature number.
01:47
Now,
01:48
we've grouped all of our operation one inspection
01:50
dimensions together and we're gonna measure those together.
01:53
Now,
01:54
piston OD 1.053.
02:02
So this part measures 1.053. It's good.
02:07
We're gonna write that down on our inspection sheet and move on.
02:12
But what if it didn't measure? Perfect. Let's say it measured
02:16
one inch 0 60
02:18
out of spec outside of our tolerance.
02:22
This is how we'd fix it.
02:24
We would take that dimension 1.06
02:27
subtract it from our nominal 1.053 which means
02:31
our part would be 7/1000 of an inch oversized
02:36
diameter.
02:38
We can go right to our machine and enter that value
02:41
to make a correction for next time.
02:43
A diameter wear adjustment will take more or less
02:46
material off of our parts during finish passes,
02:49
cutter compensation is another name for our diameter wear adjustment.
02:54
Um Let me grab it to hold on a second.
02:58
Uh This is easier to explain.
03:01
This is our tool.
03:02
If we put in a negative value, it's gonna bring it towards our part feature,
03:06
our part contour, making it smaller.
03:08
If we put in a positive wear compensation,
03:10
it's gonna bring it away from our part further.
03:13
So we can go towards our part
03:16
or away from our part contour
03:19
based on those diameter wear values.
03:21
Now, if we wanted to bring our tool up or down,
03:24
we would use our length wear compensations.
03:26
We can add in a value, positive value to bring our tool up
03:29
negative value to bring our tool down.
03:32
We're gonna talk a bit more about that in our next inspection video.
03:36
So we'll come back to it.
03:38
We can work our way down through our inspection sheet. And again,
03:42
the purpose of this video is not to show you how to inspect every feature.
03:47
It's to show you how these values relate to our
03:50
machine and how we can make adjustments as machinist.
03:54
We can measure our board depth, our, our 0.55 value here with a set of calipers,
04:00
make the adjustments at the machine
04:02
with our tool length offset.
04:05
We can measure that board diameter, the id of 0.9 inches.
04:10
This value uh is pretty wide open 0.9.
04:14
There's only one digit past the decimal place,
04:17
which puts it at plus or minus 50/1000 of an inch.
04:21
We're gonna go ahead and use our board gauge to measure
04:23
this because I've got it here and it's all set up.
04:26
But really with the tolerance that wide open, we could use a
04:30
set of calibers,
04:32
measuring champers can be tough for champ for angles. I usually just
04:37
measure or verify the angle of the champ tool itself.
04:42
Now, often times the included angle,
04:47
written on the website where we've bought the tool.
04:49
If the angle is critical,
04:52
we can measure the actual angle using an
04:54
optical comparator or some kind of comparative gauge.
04:57
Now, no tolerance was explicitly noted with the dimension.
05:01
So we will refer to our block tolerance that says
05:04
our angle must be within plus or minus one degree.
05:07
Our 10 thou Cher
05:09
uses a block tolerance of plus or minus 0.02 inches.
05:14
It's two digits past the decimal place. So plus or minus 0.02.
05:19
Now, I know what some of you are thinking,
05:21
would the part still be good
05:24
if it had no champ for at all?
05:27
Well, yes, technically, according to the letter of the law,
05:32
uh a
05:33
champer of zero length would fall within our plus or minus 20 thou tolerance,
05:39
but you're stretching things.
05:41
There don't be a wise guy
05:42
that's not what the designer intended. Look at the intent of the drawing.
05:48
Designers will often add notes like break all sharp
05:51
edges to make their intent as clear as possible.
05:54
If a Cher
05:55
were critical for some reason the designer would
05:57
add a more specific tolerance to the feature
05:60
with a wide open tolerance like this.
06:02
I'd be comfortable measuring the champers visually.
06:05
Uh comparing it against a set of calipers or a depth micrometer
06:10
and looking at that through a loop
06:12
using an optical comparator might be
06:14
needed to measure tighter tolerance champers.
06:17
Now, if there's any doubt at all, go talk to somebody else,
06:21
another inspector and ask them how a part should be measured or if all else fails,
06:26
give the customer a call just to make sure that we're all on the same page.
06:31
When in doubt,
06:33
ask.
06:34
Now this was not meant to be a
06:36
comprehensive video on part inspection and metrology. Metrology is a
06:41
kind of a study of inspection like this.
06:44
This is meant to be a video that shows us how part measurements
06:48
can be used to enter small changes at the control to make better parts.
After completing this video, you’ll be able to:
How to buy
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