Feasibility of inspecting large radius with short arc length
Feasibility of inspecting large radius with short arc length
(OP)
Hello all,
Can anyone shed some light on the feasibility of inspecting the 4.375R on the attached drawing? We have an OGP smartscope and the operator is using video and\or laser scanning to measure the radius. What I'm trying to convey to him is first, I think he should be hard probing this feature. Second, because of the short arc length (about 17 deg)it's an insufficient amount to get an accurate reading. Our optical comparators you need atleast 30 degrees of arc to measure accurately. Thanks in advance for your help!
Doug
Can anyone shed some light on the feasibility of inspecting the 4.375R on the attached drawing? We have an OGP smartscope and the operator is using video and\or laser scanning to measure the radius. What I'm trying to convey to him is first, I think he should be hard probing this feature. Second, because of the short arc length (about 17 deg)it's an insufficient amount to get an accurate reading. Our optical comparators you need atleast 30 degrees of arc to measure accurately. Thanks in advance for your help!
Doug





RE: Feasibility of inspecting large radius with short arc length
Mike Halloran
Pembroke Pines, FL, USA
RE: Feasibility of inspecting large radius with short arc length
RE: Feasibility of inspecting large radius with short arc length
RE: Feasibility of inspecting large radius with short arc length
Google for "Fundamental Good Practice in the Design and Interpretation of Engineering Drawings for Measurement Processes". When you find the document (it is 99 pages long and fully free), look at pages 64-66. I think this may interest you.
RE: Feasibility of inspecting large radius with short arc length
Season
RE: Feasibility of inspecting large radius with short arc length
I don't find pages 64-66 of the "Fundamental Good Practice in the Design and Interpretation of Engineering Drawings for Measurement Processes" document helpful because it seems to focus on minimum zone vs least squares algorithms while neither one is useful in this case. It's good about pointing out the issues with partial cylinders, but where's the discussion of how a profile tolerance zone with the profile tolerance and tolerance zone constraint based upon functional need will provide well without any of the problems associated with finding a radius value and center location?
Dean
www.d3w-engineering.com