# Doubts in Ztilt and Bed Mesh **URL:** \ **Category:** General Discussion\ **Created:** [July 10, 2023, 5:19pm UTC](https://klipper.discourse.group/t/doubts-in-ztilt-and-bed-mesh/9395 "2023-07-10T17:19:59Z")\ **Posts on this page:** 1\ **Showing post:** 9
**Author:** ![LifeOfBrian](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/lifeofbrian/32/2380_2.png) [@LifeOfBrian](https://klipper.discourse.group/u/LifeOfBrian)\ **Post date:** [July 10, 2023, 7:04pm UTC](https://klipper.discourse.group/t/doubts-in-ztilt-and-bed-mesh/9395/9 "2023-07-10T19:04:12Z")
Z\_positions are the points of the joints where the bed-plane “crosses” the respective Z spindles. It is not the point of the arm where it connects to the bed. See my illustration here (triple Z motors and 0,0 at right rear corner): > [@Ender 6 Triple Z tile moves in the wrong direction but Z Home is correct on all 3 steppers](https://klipper.discourse.group/t/ender-6-triple-z-tile-moves-in-the-wrong-direction-but-z-home-is-correct-on-all-3-steppers/9193/17): > > Even if the bed shown in the photo is 290x290 the respective z joints are outside this area! So if you have X=0 and Y=0 in the rear right corner of the bed then just measure always on the x and y axis the distance to the joints. That is what I showed you in your picture in my last post. (For Z the x coordinate can’t be 133 if the overall bed size is 290 and the spindle is in the middle of the X axis. So this must be 290/2=145.) If you can’t reach all corners of the bed with your hotend/BLTouc… Some of those values can be negative as those are mostly outside the printable area. The points under the z\_tilt section are the coordinates of the nozzle closest to the Z\_positions. Those points normally are within the printable area. --- _[View the full topic](https://klipper.discourse.group/t/doubts-in-ztilt-and-bed-mesh/9395)._