BobsCNC E4, Assembly Manual

Page: 70 / 102

Page 70
The SG20U Bearings should roll across the rail, there
should be a small amount of
preload (i.e., they should
securely engage the rail and roll firmly). Check the
bearings to ensure that they are snug up against the rail.
The bearing should move along the rail when rotated by
hand.
If any of the bearings rotate without engaging the rail:
•
Remove both of the Y rods
•
Loosen the 2 nuts on the slotted holes on each side and slide the SG20U bearings upward
•
Snug the SG20U bearing nuts
•
Repeat 1 thru 4.
Place the Y Rail Stops one on each side of the gantry and secure
each with 2
- M4 x 25 Screws and Nuts. Please note the
orientation (the Rail Stop must cover the ends of the rails,
keeping them in place).
Step 4