part inspection tools

[CajunCAD91]

I am looking for a reliable & repeatable method/tool to measure a radius on a pipe. In our application we are making oilfield equipment that consists of a pipe with an "upset" (larger diameter section on an offset centerline). The radius (4" to 8" radius) we are trying to measure begins tangent with the pipe OD and ends tangent on a transition angle to the larger OD.

I found this

http://www.arcmaster.ca/

but don't know if we can pass calibration/certification standards for use. Any recommendations would be appreciated.

Louis

 

[BillPSU]

One simple and inexpensive approach is to make radius gages by using a CAD program and generate a arc on card stock. Plot/print the radius using 1 to 1 size. Laminate the card stock and carefully cut the radius out from the laminated card using the printed radius as a guide. If you find this acceptable make the template out of metal. You could make gages every 1/4" radius or whatever steps you desire.

 

[Pressed]

Can you cut a section from the pipe and put on an Optical Comparator, those are reliable & repeatable and have been in use for decades.

[URL unfurl="true"]http://www.starrett.com/pages/745_vb300.cfm[/URL]     for example

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http://mech.e.tripod.com

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http://www.tailofthedragon.com

 

[MadMango]

You could also use a series of pegs in a board, basically making a Go/NoGo gage for the bent pipe.

[green]"Art without engineering is dreaming; Engineering without art is calculating."[/green]
Steven K. Roberts, Technomad
Have you read faq731-376 to make the best use of Eng-Tips Forums?

 

[ajack1]

I agree with MadMango a go/no gauge would seem the obvious solution as well as pegs for location and possibly clamps, maybe toggle a go/no go gauge could be wire eroded, laser cut or water jet cut.