On Sun, 2008-01-27 at 14:09 -0500, John Kasunich wrote: > John Kasunich wrote: > > > For measurements every inch, you can often find jig-borer micrometer > > sets on ebay or other surplus places, often mis-listed as inside mics > > like this one: > > > > http://cgi.ebay.com/PRATT-WHITNEY-10-PIECE-INSIDE-MICROMETER-SET_W0QQitemZ140200200097QQihZ004QQcategoryZ41937QQssPageNameZWDVWQQrdZ1QQcmdZViewItem > > > > (7 hours to go, $22.50) > > Another couple sets: > > http://cgi.ebay.com/INSIDE-MICROMETER-AND-END-MEASURE-SET_W0QQitemZ350017355826QQihZ022QQcategoryZ41937QQssPageNameZWDVWQQrdZ1QQcmdZViewItem > > Missing a few parts, makes it less interesting to most buyers, but it > has three 12" standards, so it can do 1" to 51" in steps of 1". No bids > so far, with less than one day to go, and an asking price of $20. > > http://cgi.ebay.com/PRATT-WHITNEY-11-PIECE-INSIDE-MICROMETER-SET-0001_W0QQitemZ330206299195QQihZ014QQcategoryZ41937QQssPageNameZWDVWQQrdZ1QQcmdZViewItem > > This set is complete, has 3 bids ($10.50) so far, and will probably go > up a bit. > > There are a few more as well. > > Even cheaper would be a set that is missing the micrometer head. > However, they'll be harder to find because they're more likely to be > mis-listed as something else. Perhaps search for Pratt & Whitney or > Lufkin, since the rods are usually marked with the makers name. > > Like anything, its possible that the rods are worn and no longer > accurate. You can do some testing, by comparing for instance a 12" rod > to another 12" rod, or to the sum of a 6" and two 3", etc. In general > though, people tended to use those things gently. > > Regards, > > John Kasunich
Thanks John, excellent idea. Even if the rods are a little off, I suppose you could have them professionally measured. Any rod would be good as long as you know accurately how long it is. This is more expensive, but may be another possibility: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=230216180586 No ideas on DIY laser encoders? -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe, Bridgeport mill conversion, doing XY now, Zubal lathe conversion pending) ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
