Reading Optical Flats Part 2
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- เผยแพร่เมื่อ 26 ส.ค. 2024
- Beyond some hit and miss experimenting, much of what I’ve learned about interpreting optical flat fringe patterns comes from a 1950s DoALL book titled: “The Science of Precision Measurement”. Illustrations from this book and other DoALL sources are included with the permission of DGI Supply, a DoALL Company: www.dgisupply....
Although universally known for their bandsaws, in the last half of the 20th century DoALL manufactured and distributed a wide variety of machining products and offered a full line of metrology equipment as well as extensive literature describing its use. This book is a product of that educational initiative and the best reference I’ve found for extracting detailed, quantitative surface contour information using optical flats. It is available for online reading at: babel.hathitru...
Another DoALL book, first published in 1964 and, again, out of print, titled “Fundamentals of Dimensional Metrology” by Ted Busch for the Wilkie Brothers Foundation builds upon the earlier book’s optical flat content and is available on the used book market. The Wilkie Brothers Foundation is an educational and development arm of DoALL, founded by Leighton Wilkie, the founder of DoALL, and his brothers.
There are many offerings discussing aspects of optical flats on the internet. Here are a few links to things that might be of interest:
en.wikipedia.o...
www.starrett-we...
www.kemet.co.u...
www.kemet-inte...
www.advancedop...
www.gagesite.c...
www.lapmaster-...
www.surfacefini...
Great video, thank you for taking the time to make this!
I am so excited for the next video in this series, and to continue to learn from your channel.
I have been a bit obsessed with flatness as a by-product of restoring antique tools. Mostly hand tools. I know it is orders of magnitude more precision than I need, but after watching your videos in this series I am inspired to pick up a surplus optical flat. Metrology is my second favorite (due to expense) hobby, and before your video I believed this level of precision was unobtainable. If you enjoy making videos, I hope you continue. I am interested in soaking in all the information from you that I possibly can.
Much appreciate your insight and knowledge of this complex subject
Thanks. But just learning myself.
What a shame if you don't do part 3. It's the best info on optical flats there is.
Thank you so much for this great series! Are you planning to issue the next video in the series? I've subscribed so I don't miss it if you decide to publish it.
Part 3 in the works and more planned.
Thank you for putting all this together. I look forward to part 3. My Optical Flat light is green for a 10.7 millionths per fringe. I wonder if a light is made that gives 10 millionths per fringe? I prefer the green simply because it is NEARLY 10 millionths.
Fantastic information, thank you!
Glad it was helpful!
@@workshopengineering Just watched it again and printed out a bunch of screenshots (after receiving our flats and building the monochromatic light box). Thank you!
very helpful
tnx
It's been a while now. Are you still going to make part 3? I hope so. Thanks.
Is weird but helium light is not monochromatic, sodium lamp light is and the wavelenght is 589. Why they say helium in the manual?
Commercial "monolights" from DoALL and Van Keuren are said to be helium. Lapmaster: www.lapmaster-wolters.com/monochromatic-light.html advertises both helium and sodium versions. Apparently both have sufficiently narrow bandwidth to produce distinct interference fringes.