Originally Posted by
ShayArnett
That area is just the mounting points for your leadscrew. Different people will have different things there, just depends on how you want to put it together. Some will have the motor directly coupled on one end and the other end free floating, some will add a bearing to the non-motor end to help support the rod, and some will add bearings to both sides to be able to tension the rod.
The plans should be very detailed as to the way JGRO designed it. I say go ahead and build it as is, then you will better understand what is going on there and what you may or may not want to do to improve on that when you switch to acme.