{"data":{"fields":"term_definition","term_definition":"<div class=\"definition\">Change gears which control the time interval that a cutter or grinding wheel is engaged with the work. They control the rate of rotation of the feed cam.<\/div><div class=\"align align-image align-left\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\"><img src=\"https:\/\/www.gleason.com\/images\/UNSJTW.a48a\/nocrop\/Ratio_of_Roll_Gears.gif\" alt=\"Ratio_of_Roll_Gears\"><\/div>"}}