{"action":"created","issue":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/11103","repository_url":"https://api.github.com/repos/MarlinFirmware/Marlin","labels_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/11103/labels{/name}","comments_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/11103/comments","events_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/11103/events","html_url":"https://github.com/MarlinFirmware/Marlin/issues/11103","id":335179048,"node_id":"MDU6SXNzdWUzMzUxNzkwNDg=","number":11103,"title":"[bugfix-2.0.x]Slow down near the bed center.When JUNCTION_DEVIATION is enabled in Delta.","user":{"login":"JXPA","id":32482481,"node_id":"MDQ6VXNlcjMyNDgyNDgx","avatar_url":"https://avatars0.githubusercontent.com/u/32482481?v=4","gravatar_id":"","url":"https://api.github.com/users/JXPA","html_url":"https://github.com/JXPA","followers_url":"https://api.github.com/users/JXPA/followers","following_url":"https://api.github.com/users/JXPA/following{/other_user}","gists_url":"https://api.github.com/users/JXPA/gists{/gist_id}","starred_url":"https://api.github.com/users/JXPA/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/JXPA/subscriptions","organizations_url":"https://api.github.com/users/JXPA/orgs","repos_url":"https://api.github.com/users/JXPA/repos","events_url":"https://api.github.com/users/JXPA/events{/privacy}","received_events_url":"https://api.github.com/users/JXPA/received_events","type":"User","site_admin":false},"labels":[{"id":855096300,"node_id":"MDU6TGFiZWw4NTUwOTYzMDA=","url":"https://api.github.com/repos/MarlinFirmware/Marlin/labels/C:%20Motion","name":"C: Motion","color":"006b75","default":false}],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":48,"created_at":"2018-06-24T13:22:50Z","updated_at":"2018-09-14T03:11:11Z","closed_at":"2018-06-30T21:27:55Z","author_association":"NONE","body":"<!--\r\n\r\nHave you read Marlin's Code of Conduct? By filing an Issue, you are expected to comply with it, including treating everyone with respect: https://github.com/MarlinFirmware/Marlin/blob/1.1.x/.github/code_of_conduct.md\r\n\r\nDo you want to ask a question? Are you looking for support? Please don't post here. Instead please use the Marlin Firmware forum at http://forums.reprap.org/list.php?415 or the Marlin Facebook Group https://www.facebook.com/groups/1049718498464482/.\r\n\r\nBefore filing an issue be sure to test the 1.1 and/or 2.0 \"bugfix\" branches to see whether the issue is already addressed.\r\n\r\n-->\r\nHi,\r\nYesterday I replaced the stepping motor on the XYZ axis from 1.8 deg. to 0.9 deg..\r\nThe motor driver continues to use TMC 2130.\r\nI changed the microsteps setting and flashed latest Marlin.\r\nThen, the delta effectors began to make a strange movement.\r\nI took a video of the situation.\r\n\r\n[https://i.imgur.com/cVv1aw8.mp4](https://i.imgur.com/cVv1aw8.mp4)\r\n\r\nIn the video I run X +50mm twice and then run X -50mm twice.\r\nMovement slows down in the area of about 40 mm radius at the center of the bed.\r\nBefore changing the motor, it was always running at constant speed.\r\nDo you know why the movement slows down at the center?\r\n\r\n[Configuration.zip](https://github.com/MarlinFirmware/Marlin/files/2130807/Configuration.zip)\r\n"},"comment":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/comments/421217571","html_url":"https://github.com/MarlinFirmware/Marlin/issues/11103#issuecomment-421217571","issue_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/11103","id":421217571,"node_id":"MDEyOklzc3VlQ29tbWVudDQyMTIxNzU3MQ==","user":{"login":"tcm0116","id":1868773,"node_id":"MDQ6VXNlcjE4Njg3NzM=","avatar_url":"https://avatars2.githubusercontent.com/u/1868773?v=4","gravatar_id":"","url":"https://api.github.com/users/tcm0116","html_url":"https://github.com/tcm0116","followers_url":"https://api.github.com/users/tcm0116/followers","following_url":"https://api.github.com/users/tcm0116/following{/other_user}","gists_url":"https://api.github.com/users/tcm0116/gists{/gist_id}","starred_url":"https://api.github.com/users/tcm0116/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tcm0116/subscriptions","organizations_url":"https://api.github.com/users/tcm0116/orgs","repos_url":"https://api.github.com/users/tcm0116/repos","events_url":"https://api.github.com/users/tcm0116/events{/privacy}","received_events_url":"https://api.github.com/users/tcm0116/received_events","type":"User","site_admin":false},"created_at":"2018-09-14T03:11:11Z","updated_at":"2018-09-14T03:11:11Z","author_association":"CONTRIBUTOR","body":"@JXPA - I was able to replicate your issue by following the steps below:\r\n\r\n- Power on printer\r\n- Run M502\r\n- Run M500\r\n- Run G28\r\n- Effector moves downward\r\n\r\nI'll try and see if I can debug why that's happening."}}
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