{"action":"created","issue":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2679","labels_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2679/labels{/name}","comments_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2679/comments","events_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2679/events","html_url":"https://github.com/MarlinFirmware/Marlin/issues/2679","id":110203723,"number":2679,"title":"Delta Printer moves to illegal coordinates","user":{"login":"boulway","id":15013431,"avatar_url":"https://avatars.githubusercontent.com/u/15013431?v=3","gravatar_id":"","url":"https://api.github.com/users/boulway","html_url":"https://github.com/boulway","followers_url":"https://api.github.com/users/boulway/followers","following_url":"https://api.github.com/users/boulway/following{/other_user}","gists_url":"https://api.github.com/users/boulway/gists{/gist_id}","starred_url":"https://api.github.com/users/boulway/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/boulway/subscriptions","organizations_url":"https://api.github.com/users/boulway/orgs","repos_url":"https://api.github.com/users/boulway/repos","events_url":"https://api.github.com/users/boulway/events{/privacy}","received_events_url":"https://api.github.com/users/boulway/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":8,"created_at":"2015-10-07T11:23:27Z","updated_at":"2015-10-07T13:58:46Z","closed_at":null,"body":"Hi there,\r\n\r\nI was a silent reader for a long time but I guess I should contribute a bit too.\r\nSo here I go.\r\n\r\nMy Setup is: Rostock Mini Pro with Sanguinololu / Atmega1284P\r\n\r\nI had a lot of trouble getting my Delta printer to move the way it should and after some tests I figured out, that the Delta is moving to illegal coordinates.\r\nFor example:\r\n-\tSend G1 Z90 X80 Y80 to drive to one edge of the print bed\r\n-\tPrinter moves arms correctly until one of the arms reaches its maximum (90° to one smoothrod)\r\n-\tNow the printer glitches and it moves all axis equally down like it got just a Z decrement instruction\r\n-\tOf course the head crashes if you cannot reset the printer fast enough ;)\r\n\r\nI guess the Software glichtes if driving to coordinates that are in an illegal section of the print bed.\r\nFor my I fixed it with manually testing how far I can to one edge until the system will move down till head crash.\r\nI hardcoded it in the software now but it would be nice if there could be a test to avoid the automatic head crashing.\r\n\r\nBest Regards,\r\nConstantin"},"comment":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/comments/146203495","html_url":"https://github.com/MarlinFirmware/Marlin/issues/2679#issuecomment-146203495","issue_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2679","id":146203495,"user":{"login":"clefranc","id":4294448,"avatar_url":"https://avatars.githubusercontent.com/u/4294448?v=3","gravatar_id":"","url":"https://api.github.com/users/clefranc","html_url":"https://github.com/clefranc","followers_url":"https://api.github.com/users/clefranc/followers","following_url":"https://api.github.com/users/clefranc/following{/other_user}","gists_url":"https://api.github.com/users/clefranc/gists{/gist_id}","starred_url":"https://api.github.com/users/clefranc/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/clefranc/subscriptions","organizations_url":"https://api.github.com/users/clefranc/orgs","repos_url":"https://api.github.com/users/clefranc/repos","events_url":"https://api.github.com/users/clefranc/events{/privacy}","received_events_url":"https://api.github.com/users/clefranc/received_events","type":"User","site_admin":false},"created_at":"2015-10-07T13:58:46Z","updated_at":"2015-10-07T13:58:46Z","body":">The shape of the reachable area is not necessary a circle\r\n\r\nYou're right, but most (all?) delta use a round bed, if not, the 90° still apply to them. So, we have a safe margin we can apply exceeding the radius before the clamp kicks in."}}