Search:

Assuming that you were using a Vectric product, when you choose a post processor to save a toolpath, one of the posts in the list used to be named ShopBot_inch (or something similar) and that one...

Grab the nose of the spindle and give it a push/pull in the long axis and feel for play in the lower v-bearings of the Y car. There should be no play in it. Check for play due to the motors/pinions...