# Problem Solving

#### deepikanegi

##### Starting to get Involved
If there is an issue with assembling two components but when gauged separately look good, how would you approach the problem?

#### Enghabashy

##### Quite Involved in Discussions

* some of manufacturing of components & assembly processes could need also Jigs or fixtures at designated stages
***When I specify hole diameter & the bar /shaft diameter ; the fitting should be classified also " clearance ; transient or interference fit"
****The grade of gauges could differ accordingly " Grade H of Hole & h or g for the bar/shaft ; anyhow the allowance between both maybe need more study.

#### Bev D

##### Heretical Statistician
Super Moderator
If there is an issue with assembling two components but when gauged separately look good, how would you approach the problem?
welcome Can you elaborate on the actual “issue”? Getting the Problem statement right is the first best step.

Without more information my first instinct is to look for two other parts that will “assemble correctly”. Actually you should have 3 ‘pairs of correctly assembled and 3 pair of assemblies with ‘issues’. Then swap one of the parts between the 3 pairs of good and bad assemblies. Let’s call that part A (Agood and Abad) If the Problem follows the swapped part (A) you need to look at what is different between the 3 Agood and Abad Parts. If the Assemblies stay in their original condition then you need to look for differences between the 3 part Bgood and part Bbad…

The real key here is to not think about in spec or out of spec - look for differences. Remember that the specifications can be wrong.

#### Miner

##### Forum Moderator
It could be a potential tolerance stack up problem. Try running a Monte Carlo simulation to see if that is an issue. It only takes a few minutes and could save a lot of time.

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