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Model Forum / General / Models / July 2009Accuracy stuff
I need a MT3 test bar, accurate to a hundredth of a mm, and preferably to a couple of microns, at say 150 mm. I also need an MT3-MT2 reducer sleeve, accurate to something better than the 3 thou plus the horrible one I bought from Chester is - and preferably, again, accurate to a hundredth-, or a couple of microns at 150 mm. How much does this kind of stuff cost? Anyone willing to lend a suitable MT3 test bar for beer money? Ta, (and back more soon) -- Peter Fairbrother In which part of the country are you; for there tends to be a society of model engineers in each county and / or major conurbation who I am sure would be able to assist you. >I need a MT3 test bar, accurate to a hundredth of a mm, and preferably to a >couple of microns, at say 150 mm. [quoted text clipped - 7 lines] > > Anyone willing to lend a suitable MT3 test bar for beer money? > I need a MT3 test bar, accurate to a hundredth of a mm, and preferably > to a couple of microns, at say 150 mm. [quoted text clipped - 3 lines] > preferably, again, accurate to a hundredth-, or a couple of microns at > 150 mm. Excuse my ignorance, I lurk here because I'm interesated in engineering in general but I'm an electronic engineer and don't know much about mecahanical fabrication ... What's an MT3 test bar - or at least what's it used for? I found a picture on the web but no explanation! Given that it was on a page with angle blocks and parallels I guess it's to do with measuring stuff but what? Holes? Cheers, Nobby MT3 is Morse Taper No 3, the hole in the lather spindle. A test bar ia a hardened accurate steel rod that you put into the lathe spindle, and then run your dial gauge along it to assess whether your headstock is concentric with the bed and / or whether the lathe ways are worn. >> I need a MT3 test bar, accurate to a hundredth of a mm, and preferably >> to a couple of microns, at say 150 mm. [quoted text clipped - 16 lines] > Cheers, > Nobby > MT3 is Morse Taper No 3, the hole in the lather spindle. > > A test bar ia a hardened accurate steel rod that you put > into the lathe spindle, and then run your dial gauge along it to assess > whether your headstock is concentric with the bed and / or > whether the lathe ways are worn. Ah! Thanks, that explains it. Knowing MT was Morse Taper allowed another visit to Wackypedia and a whole new swathe of knowledge!. Cheers, Nobby >>> I need a MT3 test bar, accurate to a hundredth of a mm, and preferably >>> to a couple of microns, at say 150 mm. [quoted text clipped - 16 lines] >> Cheers, >> Nobby |
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