Definition Rework vs. Repair - What's the practical difference?

A

alspread

#21
Rework is a repair that can be accomplished within the scope of the contract/drawing/specification, etc.

Machining is an easy example: If you are contracted to machine a component and you create a nonconformance that can be corrected by machining and you do not violate any controlled process requirements of the order/contract//spec, etc (i.e. remachining a hole that is too small) then that is rework.

A repair requires processing beyond the scope of the contract/drawing/spec, etc.

Again a machining example: If you are contracted to machine a component and you create a nonconformance that requires something or some process not permitted or specified on the contract/drawing/spec, etc (i.e. plug/sleeve/weld,etc an oversize hole is a repair and is typically authorized by the customer and/or design authority) then that is a repair.

Good luck
 
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L

Lmyers

#22
I believe that it is more the opposite. A major change is more like a hole relocation which renders a part different in form or interchangeability and may require a repair (welding the hole closed and drilling a new hole in the new location). See ANSI Y14.5. The minor change would be the enlarging of a hole to meet a new larger diameter. The difference? When you fill a hole by welding it closed or using another filler material the alloy that is used as a filler cannot match the alloy of the existing material of the part, nor is the structure of the part the same of a part that is manufactured and not drilled and filled. The result is the repaired part can never completely meet the drawing while the reworked can.
 
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John Broomfield

Staff member
Super Moderator
#26
I'm not sure if this is a dumb question, but :eek:
What's the practical difference between rework and repair? Are they different in a manufacturing enviroment.
Thanks
AC
It matters because one action involves design change control per 7.3.7 the other does not.

Rework is work done to eliminate a nonconformity to make the product meet the original specification. For example, hole drilled too small, re-drill to correct size.

Repair is as design change because the work done needs an approved repair specification. For example, hole drilled too big, fill with weld material and re-drill to correct size.

Your car insurance policy probably gives the insurance company permission to use (cheaper) non-OEM parts so they have pre-approval for repair work on your damaged car. Rework would require use of OEM parts.

Customers cannot see evidence of rework but usually they can of repair.:2cents:
 
A

AdamP

#27
Interesting thread. It seems there are a couple "types" of answers here. One group follows the ISO, ASQ, etc. definitions, which are helpful for understanding the more practical side - which refer to specific industries, can leverage the definitions within an operational setting.

My experience with it is from aircraft MRO - maintenance, repair and overhaul. So in that context, I have to disagree with an earlier post that suggests both rework and repair have negative impact on the bottom line, since repairing turbine engine parts is often a better financial decision than buying new.

A painful expample on a difference: We were repairing a turbine part as customer contracted work in accordance with an FAA and OEM approved repair manual. A mistake was made during the repair, resulting in rework in order to bring the part into specification. The feature being repaired could only be repaired (modified) 4 times over the life of the part. The mistake and resultant rework affected that feature and therefore cost us 25% of the part's useful life.

One key point linking both types of answers though is the 'customer approved' bit.
 
W

whitey115

#28
In our opinion, If the item does not meet customer requirements and needs to be remade to customer requirements...is this considered the classic form of rework?:thanx:
 
#30
In our opinion, If the item does not meet customer requirements and needs to be remade to customer requirements...is this considered the classic form of rework?:thanx:
Not if the original part is scrapped off and disposed of. That's not rework at all, in my experience - it's replacement...

Rework means doing something to the out of spec part to bring it into spec, without materially changing the part. For example, drilling a hole larger than was originally produced. Bushing a hole which was drilled oversize is repair...
 
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