Tolerance on Boeing Drawings
Tolerance on Boeing Drawings
(OP)
Gouge damage was blended from a web. The deepest blend is 0.020 inch. The blend was accomplished at 20:1 taper ratio. Nominal thickness measured of the web is 0.103 inch.
The material type and stock size is stated on Boeing Part List. The stock thickness as stated on Part List is 0.1 inch.
On the applicable Boeing drawing for the web, no where is the web thickness shown. The drawing gives a generic tolerance on page 1 of the drawing as +/- 0.03 inches. Can this drawing tolerance be used to justify the 0.02 inch blend as being within the drawing tolerance?
Thanks
The material type and stock size is stated on Boeing Part List. The stock thickness as stated on Part List is 0.1 inch.
On the applicable Boeing drawing for the web, no where is the web thickness shown. The drawing gives a generic tolerance on page 1 of the drawing as +/- 0.03 inches. Can this drawing tolerance be used to justify the 0.02 inch blend as being within the drawing tolerance?
Thanks





RE: Tolerance on Boeing Drawings
RE: Tolerance on Boeing Drawings
I've used the dwg tolerance for machined/chem milled parts but not for sheet metal. I'd think that if you wanted to use a tolerance there, the appropriate tolerance would be that of the sheet thickness in the material spec.
RE: Tolerance on Boeing Drawings
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Tolerance on Boeing Drawings
"no" to all these questions should give you some assurance that the blend is minor.
removing 20% of the material is reasonably significant. i'd recommend a thickness check after blending to verify what's left.
20 thou is going to be outside the sheet thickness tolerance, i'd guess that it's less than 10 thou.
RE: Tolerance on Boeing Drawings
I checked the material spec also, but it did not specify tolerance.
RE: Tolerance on Boeing Drawings
I had a hell of a time tracking this info down the last time I needed it though and found several conflicting values.
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?