By the by....if your gantry is not moving manually when you push it, then you definately have an obstruction somewhere...... most likely in the bushing that moves along the lead screw which means if you look at the lead screw the tephlon coating is frayed or gone and needs replacing. DO NOT GREASE YOUR LEAD SCREW!!!!!!!!!!!!!! Common error is to slap some grease down there when it actually hurts the operation.