I have a thin strip of sheetmetal, .0235" thick, that is bent twice forming "half" of a surround for a door opening. I can measure height, width, length, corner radius. What I DON't know how to do is measure the overall linear length of the part if it were "unbent" or straightened out. In my mind this is basically figuring out the circumference. Anyone know how to do this?
length of sheetmetal
Collapse
X

Any measurement you derive from the formed part is not going to be the actual size of the "preformed" part. It can be done however. Do you want to include the radii, or do the length of each leg where they intersect each other then add them (the latter would be the easiest)?<internet bumper sticker goes here>
Comment

tape measure
or something like one, will probably be what we'll end up using. This project is full of these types of weird parts. They all have to be laser beam welded, so the tolerances are tight, even on extremely nonrigid parts like this one.
The print for this part has an overall width and overall height, corner radius callout, thickness of material and part depth...but it has no note for fixturing. There is enough springback in this part to make the corner radii outtol, unless they are fixtured against a nominal size radius block. Yet, it gets left to me to come up with such a device on no budget.** "Well, ain't this place a geographical oddity. Two weeks from everywhere!"~ Ulysses Everett McGill **
Comment

yes the formula is C=2PIR THEN DIVIDE BY FOUR OR C=PiR DIVIDE BY TWO.
SUPPOSE THAT YOU NEED TO DETERMINE THE TOTAL LENGTH OF STEEL ROD.
FORMED AT 90ยบ WITH A RADIUS OF 2" AND A DISTANCE FROM THE EDGE TO THE TANGENT RADIUS TO BE 8" AND THE OTHER SIDE DISTANCE TO THE TAGENT RADIUS 6" AND THEN WITH A THICKNESS OF 1". YOU WILL NEED TO ADD 8IN + 6 IN OR 14IN TOTAL.WHEN THE ROD IS BENT THE MATERIAL IS STRETCHED AND THE MATERIAL IN THE INSIDE COMPRESSED.THEN ADD HALF OF THE THICKNESS TO YOUR RADIUS.YOU HAVE IS THIS SAMPLE THE ANSWER IS.
3.1416 X 2.5RADIUS=7.854/2=3.927 + 14IN=17.927IN TOTAL LAYOUT.
I TRIED TO SEND YOU INF,BUT I'M HAVING PROBLEMS WHEN I INSERT A DOCUMENT,I HOPE THIS HELPS.
Comment
Related Topics
Collapse

by dwadeQuestion on the extended length in the tolerance line. I've got a part with a rod 120mm long and if I measure a cylinder covering the entire length will...

Channel: PCDMIS for CMMs
07282008, 01:47 PM 

by andrewb91Hello everyone, I've got a question. I'm trying to measure a tube roughly the shape of a fancy "J" with several bends from 9 to 90 degrees....

Channel: PCDMIS for CMMs
05022018, 03:49 PM 

by larrybellI have 4.2 Pro and have been asked to check arc length of a section of a part. The part is approx. 24" OD with .080 wall. It is a 90 degree section...

Channel: PCDMIS for CMMs
07292009, 04:06 PM 

by mfarre03I am having trouble performing the length check out on my Romer. I have not checked length using the bar in over a year. I recently replaced my 6mm ruby...

Channel: PCDMIS Portable
09052009, 10:38 AM 

by Jim PoehlerGood morning all.
I haven't been able to find a place that defines my question so I'll throw it out here. I have a part to program that is a small...
Channel: PCDMIS for CMMs
10232019, 06:46 AM 
Comment