my lathe was lacking a spindle index sensor and quadrature encoder, so I built one as follows:
The code rings are printed on plain paper with an inkjet printer, and laminated into a plastic pouch; then cut with a scissor and glued to the spindle pulley (with some pressure so as to get a reasonably flat surface). The pulley on my lathe is 18cm in diameter and has about 2cms wide space for the code rings. Laminating the paper into the a plastic pouch protects the printout very well against oil and cooleant. The sensor are reflex couplers - I had CNY70's at hand, so I used those. The schematic is unspectacular: http://static.mah.priv.at/cnc/index.pdf . The couplers are mounted at about 1.5mm distance from the codewheel. - edit codewheel parameters in the Postscript source file to your liking: http://static.mah.priv.at/cnc/codewheel.ps - the parameters are reasonably documented. Pictures: http://mah.priv.at/gallery2/main.php?g2_itemId=68003 -Michael ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
