Enlarging grooves in a 6-inch pitch lap
Channel: iutubeus
Date: 2012-11-13

TW shows how to enlarge grooves, aka relief lines, aka slurry channels in a pitch lap for making telescope mirrors. After using my mirror polishing tool for several dozen hours, the tiles in it have largely expanded into the grooves, restricting the flow of the polishing agent (Cerium Oxide) and limiting opportunities for the tiles to reshape.

Progress on this project is documented at http://astroscopy.wordpress.com Many thanks to the telescope workshop of the Santa Barbara Astronomical Unit for making this project possible!