Using a Tape Measure for +/- 1/16" Tolerance - Large Welded Assemblies (6 to 12')

K

kwalityguy

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#1
#1
I am returning to an industry that uses a tape measure to measure large welded assemblies (6 to 12'). The typical tolerance is +/- 1/16", basically throwing the 10 to 1 rule out the window.

What is out there for gages besides a Romer which isn't very practical to wheel around outside in a steel yard or around a welding area?

I looked around Elsmar but didn't find a similar thread (hard to believe).
 
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harry

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#2
#2
Are you sure the 1/16" tolerance apply to the length? To my mind, they apply to the legs, etc (refer to the relevant welding codes) but not the length. Just ask yourself whether any welder is able to keep to this tolerance bearing in mind that a generally used welding rod is much bigger than that.
 
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K

kwalityguy

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#4
#4
Yes, I used a 12' Gold for several years to inspect fiberglass truck roofs and hoods. What I'm looking for is something I can give 3 inspectors for incoming, roving/in-process and final inspections. I think a portable CMM would be too cumbersome. Not my first choice.
 
K

kwalityguy

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#7
#7
I thought about those but they are limited to line of site and they need something to reflect off of (inside diameters/lengths). Not so good for outside dimensions/cross taping a flat sheet for squareness. Need something like a linear scale except it's flexible like a tape measure.
 
K

kgott

#8
#8
I know welded assembles have to fairly precise but I don't know about 1/16th. An assembley could easily expand or contract that much depending on the whether or not its measured on a hot day or a cold day.

It may have been originally measured and cut or welded on a cold day in the workshop and inspected (measured) on a hot day out in the yard and exposed to direct sunlight and show more than 1/16 change in length or between sets of holes increasing the possiblity of NC.

If your using tapes I suggest it would advisable to calibrate them in the winter and again the summer so that any creep or contraction can be known and factored into things.
 
Jim Wynne

Jim Wynne

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#10
#10
kwalityguy said:
I am returning to an industry that uses a tape measure to measure large welded assemblies (6 to 12'). The typical tolerance is +/- 1/16", basically throwing the 10 to 1 rule out the window.

What is out there for gages besides a Romer which isn't very practical to wheel around outside in a steel yard or around a welding area?

I looked around Elsmar but didn't find a similar thread (hard to believe).
Click to expand...
You shouldn't bind yourself to "rules" that don't serve a good purpose. How you measure, and what you measure with, should be determined by objectively assessing the risks. If there's a long history of measurement with tapes and no associated problems, why change now?
 
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