After installing a Atc screen on my machine I get where the z axis will move up or down while returning to postion. When it travels up it hits the limit switch and stops the machine. I have talked to the person who made the screen and script for me and the code is fine he feels it is something in the machine. I'm looking for suggestions The router is in rapid travel when it happens Its not every time that it does it and the up or down movement is random could go either way. I have had a similar problem with run from here in the past as it is rapid moveing to the start point it will slowly lower the z into the work piece rather than rapid to xy then lower z If anyone could help that would be great If you need more details I would be happy to provide I cant provide the code as they are in encrypted files I cant view them. thanks In advance Kirk