On 02/01/2015 09:49 AM, andy pugh wrote: > On 1 February 2015 at 17:05, Kirk Wallace <[email protected]> wrote: >> I know very little about resolvers, but I think it means that resolvers >> are analog so one needs to determine what the 100% and 0% signal values >> are, and values in between (to deal with linearity) to convert to data. > The reader takes the ratio of the sin and cos voltages, so the > absolute voltage is vaguely irrelevant. > > I think what I am saying is that the tendency of folk to immediately > remove a $1000 resolver and fit a $100 encoder when doing a retrofit > might be a mistake. > I did exactly that on my Mazak. Today I might play it differently. The technology for converting resolvers to digital has gotten much cheaper. Still it is very nice to have the position indicator directly coupled to the ball screw. It might be most interesting to use the gearing that was on the tail end of the servo motor and hang it on the end of the ball screw (7:1 ratio) and then go A -> D.
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