{"action":"created","issue":{"url":"https://api.github.com/repos/grbl/grbl/issues/867","labels_url":"https://api.github.com/repos/grbl/grbl/issues/867/labels{/name}","comments_url":"https://api.github.com/repos/grbl/grbl/issues/867/comments","events_url":"https://api.github.com/repos/grbl/grbl/issues/867/events","html_url":"https://github.com/grbl/grbl/issues/867","id":123177299,"number":867,"title":"Z Axis not homing - XY home fine","user":{"login":"smartroad","id":1229033,"avatar_url":"https://avatars.githubusercontent.com/u/1229033?v=3","gravatar_id":"","url":"https://api.github.com/users/smartroad","html_url":"https://github.com/smartroad","followers_url":"https://api.github.com/users/smartroad/followers","following_url":"https://api.github.com/users/smartroad/following{/other_user}","gists_url":"https://api.github.com/users/smartroad/gists{/gist_id}","starred_url":"https://api.github.com/users/smartroad/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/smartroad/subscriptions","organizations_url":"https://api.github.com/users/smartroad/orgs","repos_url":"https://api.github.com/users/smartroad/repos","events_url":"https://api.github.com/users/smartroad/events{/privacy}","received_events_url":"https://api.github.com/users/smartroad/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":3,"created_at":"2015-12-20T18:50:41Z","updated_at":"2015-12-21T04:58:23Z","closed_at":"2015-12-20T19:07:18Z","body":"Having an issue with homing the Z axis. Using 0.9j. When I hit home the Z axis (which is off of the limit switch) moves up a small amount - then moves down - up slowly then down a small amount then stops. Exactly the behaviour I would expect it to do if it hit the limit switch but it is no where near it.\r\n\r\nThe X and Y axis home exactly as it should, move over, click the limit switch, slow move and then pull off 1mm. The Z axis just doesn't move up towards the limit switch. If I hold the limit switch (pretending the Z axis is already home) it throws an error after moving down a little: \"ALARM: Homing fail\".\r\n\r\nI am guessing I have a setting (software or physical) wrong somewhere but no idea where to look as I am confused due to the XY homing fine."},"comment":{"url":"https://api.github.com/repos/grbl/grbl/issues/comments/166202972","html_url":"https://github.com/grbl/grbl/issues/867#issuecomment-166202972","issue_url":"https://api.github.com/repos/grbl/grbl/issues/867","id":166202972,"user":{"login":"davemaster","id":1075807,"avatar_url":"https://avatars.githubusercontent.com/u/1075807?v=3","gravatar_id":"","url":"https://api.github.com/users/davemaster","html_url":"https://github.com/davemaster","followers_url":"https://api.github.com/users/davemaster/followers","following_url":"https://api.github.com/users/davemaster/following{/other_user}","gists_url":"https://api.github.com/users/davemaster/gists{/gist_id}","starred_url":"https://api.github.com/users/davemaster/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/davemaster/subscriptions","organizations_url":"https://api.github.com/users/davemaster/orgs","repos_url":"https://api.github.com/users/davemaster/repos","events_url":"https://api.github.com/users/davemaster/events{/privacy}","received_events_url":"https://api.github.com/users/davemaster/received_events","type":"User","site_admin":false},"created_at":"2015-12-21T04:58:23Z","updated_at":"2015-12-21T04:58:23Z","body":"Try this:\r\n\r\n1- Check the z-stop sensor\r\n2- Chenk in firmware if the z-stop is inverse/no-inverse mode according your printer model\r\n\r\n"}}