Topics created by GiulianoM

@GiulianoM:

@deckingman:

@GiulianoM:

…........................Are anti-backlash nuts a good idea for lead screws on a 3D printer Z axis?

With a bed weighing 20lb and pushing down on the lead screw nuts, gravity alone will take care of any backlash. All the lead screws and ball screws you are looking at using are for fast linear motion, usually in the X and Y directions, where gravity does not assist in taking up any "slack". That is why vendors sell anti back lash nuts.

ok, so I can get 12mm leadscrews and bronze flanged nuts for about $40 a piece, in the 1500mm length I need.

The problem is, I am not finding mounting blocks or bearing blocks to mount the screws.

Would something like these pillow block bearings be sufficient?

Vertical: http://www.ebay.com/itm/FL001-Zinc-Alloy-12mm-Bore-Self-Aligning-Pillow-Block-Bearing-Flange-T1-/252483419183

Horizontal: http://www.ebay.com/itm/2Pcs-Znc-Alloy-12mm-Bore-Diameter-Ball-Bearing-Pillow-Block-/182240847949

I'm thinking the bearings are radial or possibly deep groove, instead of angular contact…

Answering my own question:

K000 bearings used in the pillow blocks:
http://catalog.amibearings.com/viewitems/light-duty-set-screw-bearing-insert/set-screw-locking-bearing-insert-k000-series

K000 10mm bearings "rated" for 200 kgf in static radial loads… Axial loads recommended to be no higher than 20%, or 40 kgf - which equals 88 pounds of axial load with gravity.

K001 bearings (12mm) up that to about 108 pounds of axial load capacity.

<jedi wave="">Lead screws will be fine...</jedi>

If I may "hijack" this thread, bc it relevant for my topic. I do drive a big Delta with NEMA23 motors and set the drivers to 1500mA. I do blow along the board (above and beneath) with a big 80mm fan on one side, and a "pulling" 80mm fan on the other. This alone leads to thermal shutdown of one or more drivers after several hours of printing. I did put some small self-glueing heatsinks on the underside and now it doesn't overheat anymore.
Now I am wondering, if I do something wrong via config? Because everything I read about the cooling states, that I should be good with minimal airflow.

Got it, thanks.

Then I will use 2 on the Y/U axis, 1 on the X axis, and I'll use the IR probe on the Z axis.

For the Z axis, I'll home in the center, use the M584 trick to split the Z axis into 4 channels.

Then move the Z probe over 4 corners, and re-home each corner.

M584 to join the 4 steppers into Z axis again, and home in center to set Z height.