Microscope Power to use for Visual Inspections in an Aerospace Machine Shop

C

Corkie

#1
We are a machine shop which services the aerospace industry. For visual inspections under microscope, we use 10x as our standard power whenever the customer has not specified a different one. Recently, one of our customers rejected one of our parts and, when we couldn't see any defects at 10x, were informed that they inspect at 30x. This customer had not specified any particular requirement on the print or PO. Question: is there any reference manual or standard that could help guide us on this subject? Thank you in advance.
 
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dsanabria

Quite Involved in Discussions
#2
Re: Microscope power to use for visual inspections

We are a machine shop which services the aerospace industry. For visual inspections under microscope, we use 10x as our standard power whenever the customer has not specified a different one. Recently, one of our customers rejected one of our parts and, when we couldn't see any defects at 10x, were informed that they inspect at 30x. This customer had not specified any particular requirement on the print or PO. Question: is there any reference manual or standard that could help guide us on this subject? Thank you in advance.
Did the company flowdown the requirements in a different document that contract review missed.

Can you provide the name of the customer - we might have had similar experiences.
 

Jim Wynne

Leader
Admin
#3
Re: Microscope power to use for visual inspections

We are a machine shop which services the aerospace industry. For visual inspections under microscope, we use 10x as our standard power whenever the customer has not specified a different one. Recently, one of our customers rejected one of our parts and, when we couldn't see any defects at 10x, were informed that they inspect at 30x. This customer had not specified any particular requirement on the print or PO. Question: is there any reference manual or standard that could help guide us on this subject? Thank you in advance.
  1. What kind of defects?
  2. What do the specifications say about pass/fail criteria?
 
C

Corkie

#4
Re: Microscope power to use for visual inspections

Answers to questions in both replies:

1) name of customer: it's not a prime, so I would rather not pass that along publicly
2) there were no other requirements other than those stated in the print and PO
3) defects were burrs and scratches
4) pass/fail criteria were generic: part must have no burrs and no scratches on sealing surfaces
 

Jim Wynne

Leader
Admin
#5
Re: Microscope power to use for visual inspections

Answers to questions in both replies:

1) name of customer: it's not a prime, so I would rather not pass that along publicly
2) there were no other requirements other than those stated in the print and PO
3) defects were burrs and scratches
4) pass/fail criteria were generic: part must have no burrs and no scratches on sealing surfaces
The customer has the advantage here because they were allowed to get away with subjective specifications. A lot depends on the amount of money involved and the general relationship with the customer, but the specifications should be made objective and measureable. There is no applicable standard because in order for it to be a standard, you and the customer would have had to agree to it in advance.
 
N

NumberCruncher

#6
Re: Microscope power to use for visual inspections

Hi Corkie

There are two different issues here. Firstly, you need to use the tool which is suitable for the job. If you know what size of defect you are looking for, you can choose the magnification accordingly. I am not aware of any standards on this. Quite simply, because the final detector is a human eye, what is correct depends to an extent upon your eyesight. However, in reality you will be employing people with normal to somewhat myopic eyesight for close up inspection tasks.

From personal experience, with a x15 binocular microscope fitted with a 1mm graticule, I can measure in increments of 0.1mm. I can see defects smaller than that, but I can only estimate the size. (The graticule is 1mm square, but divided into 10x10 squares, each of which is 0.1mm per side).

The other issue is (somewhat ironically) purely about reading the small print. What did the contract say? Is there a clause regarding acceptable defect size? If so, you should have used the correct magnification to see and presumably measure such defects. Did you inform your customer of how you would be checking your product and if so, did they accept your method?

Time for some forensic contract reviewing.

NC
 

optomist1

A Sea of Statistics
Super Moderator
#7
Re: Microscope power to use for visual inspections

Hi Corkie,

the drawing may have vague notes.....the customer may be using it to his advantage.....many drawing notes are poorly worded and bad for both parties ex: "part must be free of burrs and break sharp edges"...(just so happens there is a spec for "Corners of Undefined Shape", I think it is ISO 13715) too vague and open to interpretation.

I had to deal with this at one (casting porosity) point, the first go around the (DCAS)customer won out....shortly thereafter, a meeting was held and a revised drawing/spec was issued...including the required magnification power to be used for verification....hope this helps

Marty
 
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