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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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What sort of surface plate is this?
"Ed Huntress" wrote in message news:... wrote in message ... On Sun, 14 Mar 2010 00:55:03 +1100, "stu" no where just yet wrote: wrote in message ... On Sat, 13 Mar 2010 20:55:17 +1100, "stu" no where just yet wrote: I've just posted a picture in http://www.metalworking.com/Dropbox called "stusplate"(is it the done thing to put a direct link here?) As you can see from the reflection of newpaper, the surface has a very fine finish like no surface plate I have ever seen. It comes in a felt lined lockable box. Does anyone have any idea what this sort of plate is? Could be an optical flat. Your jpg doesn't show the size. Inspection grade optical flats are typically 5 or 6" dia and polished flat to within a fraction of the wavelength of green light. Jim So that would be pretty flat then lol I have two, one is 170mm(7inches) x 35mm(1.5inches) thick. The other is 220mm(9inches) x 35mm(1.5inches)they are labeled "precison plate" I thought about optical flats but I thought they were made from glass?(although I'm not even sure I've ever seen an optical flat) Most optical flats are glass or quartz. I have a 6"dia x 1/2" glass flat. Although your flats are opaque, bearing in mind the polish, the thickness and the careful packaging, I still think they are likely to be flat to optical precision standard Jim. Stu has a couple of toolmaker's flats. They're made with a surface that allows a gage block to be wrung to the surface, so that clamps aren't needed. It's frequently used in gage labs for qualifying and certifying instruments. Standard sizes are 2" and 4", so Stu's are something pretty special. I've seen them that big, though, in Mitutoyo's qualification lab. If you keep that surface scratch-free, there's no better way to set up a stack of gage blocks to extreme, certifiable, transferable accuracy. -- Ed Huntress BTW, I should mention that their original purpose, which is now about 30 or 40 years out of date, was to qualify custom gages that were used in production manufacturing -- go/no-go snap gages and so on. -- Ed Huntress |
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