I need help with a frame bore (mostly working)

[TheWayToTekkit]

Here's a link to the screenshots I took (I don't know how to get duplicate shots off imgur, sorry!): http://imgur.com/a/mDHLf

It's a good thing I tested this is creative mode or else getting the shots would be hard. Can someone tell me why those motors won't work? No motors attached to the bottom of the bore work but their counterparts in the inchworm drives do.