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JackJ106 - you probably have your motor connected wrong. With the Jr this is a huge problem -- there are a lot of people that have solved this here:

http://www.printrbottalk.com/forum/viewtopic.php?f=19&t=8349&p=53820&hilit=y+axis+grinding#p53820

http://www.printrbottalk.com/forum/viewtopic.php?f=15&t=8510

RetireeJay is especially helpful at that site -- just make sure and search the forum for your problem before you post your issue. You may find the answer in these links, and you will likely find it b/c someone else had it.