{"action":"created","issue":{"url":"https://api.github.com/repos/grbl/grbl/issues/1061","repository_url":"https://api.github.com/repos/grbl/grbl","labels_url":"https://api.github.com/repos/grbl/grbl/issues/1061/labels{/name}","comments_url":"https://api.github.com/repos/grbl/grbl/issues/1061/comments","events_url":"https://api.github.com/repos/grbl/grbl/issues/1061/events","html_url":"https://github.com/grbl/grbl/issues/1061","id":171893242,"number":1061,"title":"Max value for X, Y & Z step/mm (v0.8c)","user":{"login":"manusnz","id":21103162,"avatar_url":"https://avatars.githubusercontent.com/u/21103162?v=3","gravatar_id":"","url":"https://api.github.com/users/manusnz","html_url":"https://github.com/manusnz","followers_url":"https://api.github.com/users/manusnz/followers","following_url":"https://api.github.com/users/manusnz/following{/other_user}","gists_url":"https://api.github.com/users/manusnz/gists{/gist_id}","starred_url":"https://api.github.com/users/manusnz/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/manusnz/subscriptions","organizations_url":"https://api.github.com/users/manusnz/orgs","repos_url":"https://api.github.com/users/manusnz/repos","events_url":"https://api.github.com/users/manusnz/events{/privacy}","received_events_url":"https://api.github.com/users/manusnz/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":4,"created_at":"2016-08-18T12:50:59Z","updated_at":"2016-08-19T12:19:37Z","closed_at":null,"body":"Hi there,\r\n\r\nI'm wondering if anyone knows what the max value for the above ($0, $1 & $2) is? I seem to come up with a very high number (2285) when I run the calcs for the x, step/mm variable.\r\n\r\nWhen I calculate using the \"steps_per_mm = (steps_per_revolution*microsteps)/mm_per_rev\" to work out how many steps my stepper must turn to move my lead screw 1mm I end up with 2285.714 - because I have pulleys involved, this number will be well out (see below for pulley details)\r\n\r\nThanks...\r\n\r\nFeel free to skip this bit, but it gives more insight to my setup:\r\nTo further complicate things I have the stepper driving a belt via two pulleys (stepper has a 12t XL and the lead screw a 30t XL) so I've got a ratio of 2.5:1 and one full rotation of the lead screw moves the bed ~1.4mm\r\n\r\nSo even if I follow this and break it down to how many (micro?)steps to get 1mm of bed movement, I end up with ~5714 (micro)steps! \r\n200(steps) * 16(micro) * ( (1/1.4) * 2.5)\r\n\r\nIf I reverse engineer the number I need to enter into universal GCode Sender to move the bed 1mm, I use the following command: G01X17.2 (I got this through trial and error)\r\nRunning that through that I come out with 4300 steps (17.2 * 250 - 250 is the default steps/mm)"},"comment":{"url":"https://api.github.com/repos/grbl/grbl/issues/comments/241003598","html_url":"https://github.com/grbl/grbl/issues/1061#issuecomment-241003598","issue_url":"https://api.github.com/repos/grbl/grbl/issues/1061","id":241003598,"user":{"login":"swarfer","id":11569466,"avatar_url":"https://avatars.githubusercontent.com/u/11569466?v=3","gravatar_id":"","url":"https://api.github.com/users/swarfer","html_url":"https://github.com/swarfer","followers_url":"https://api.github.com/users/swarfer/followers","following_url":"https://api.github.com/users/swarfer/following{/other_user}","gists_url":"https://api.github.com/users/swarfer/gists{/gist_id}","starred_url":"https://api.github.com/users/swarfer/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/swarfer/subscriptions","organizations_url":"https://api.github.com/users/swarfer/orgs","repos_url":"https://api.github.com/users/swarfer/repos","events_url":"https://api.github.com/users/swarfer/events{/privacy}","received_events_url":"https://api.github.com/users/swarfer/received_events","type":"User","site_admin":false},"created_at":"2016-08-19T12:19:37Z","updated_at":"2016-08-19T12:19:37Z","body":"\"Theres no difference in set up from 0.8 to 0.9, the $ symbols carry over. \"\r\nreally?  not according to the wiki\r\nfor 0.9 \r\n$0=10 (step pulse, usec)\r\n$1=25 (step idle delay, msec)\r\n$2=0 (step port invert mask:00000000)\r\n...\r\n\r\nfor 0.8\r\n$0=755.906 (x, step/mm)\r\n$1=755.906 (y, step/mm)\r\n$2=755.906 (z, step/mm)\r\n$3=30 (step pulse, usec)\r\n...\r\n"}}
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