{"comment":{"created_at":"2011-10-16T03:54:05Z","body":"I agree with Alden. I have tested many stepper drivers including mine. But many drivers lose torque at some point.\r\nThe motor voltage I had applied was DC24V. I didn't test with higher voltage. I will try higher voltage input.\r\n\r\nOne other thing I was curious about is jerky sound during movement in case of high speed seekrate.\r\nI have configured GRBL ( Chamnit version ) as follows.\r\n\r\nMicrostep : 10\r\nBall Screwpitch : 10mm\r\n\r\n$0=200\r\n$1=200\r\n$2=200\r\n\r\n$5=2400 ( seekrate 2400mm/min ) --> 40mm/sec\r\n\r\nThere is no jerky sound during movement.\r\n\r\nBut when I apply $5=3600 ( seekrate 3600mm/min ) --> 60mm/sec\r\nIt generates a jerky sound during movement. Just one time exactly.\r\n\r\nI supposed to capture the pulse train but I couldn't yet.\r\nWhen I try same configuration on the CNC machine with Mach3, I didn't get such jerky sound at same movement.\r\n\r\nAlso I tried all previous version ( accellation version GRBL ) but same result I got.\r\nNext week I will try it on my motion controller. And will post the result.\r\n\r\nthank you Alden and Chamnit.\r\n\r\nBy the way, is it better to apply higher voltage to stepper in case of microstepping in general ?\r\n","updated_at":"2011-10-16T03:54:05Z","url":"https://api.github.com/repos/simen/grbl/issues/comments/2418960","id":2418960,"user":{"gravatar_id":"33ea84dd07aae5e8edb349a4710f1115","avatar_url":"https://secure.gravatar.com/avatar/33ea84dd07aae5e8edb349a4710f1115?d=https://a248.e.akamai.net/assets.github.com%2Fimages%2Fgravatars%2Fgravatar-140.png","url":"https://api.github.com/users/pauljay","id":1064559,"login":"pauljay"}},"action":"created","issue":{"number":41,"created_at":"2011-10-13T06:17:46Z","pull_request":{"diff_url":null,"patch_url":null,"html_url":null},"body":"Is there anyone who achieves more than 40KHz step frequency of GRBL Atmega328p ?\r\nI have executed several tests changing microstep level and seekrate of each axis.\r\n\r\nThe fastest one I have succeeded in is 38.4Hkz for each axis.\r\nIf I adjust parameters to get faster speed, then interrupt handler routines went wrong.\r\nSo the pulses in my osciloscope shows broken steps.\r\nAlso the EEPROM data area is broken to show incorrect values. But it shows correctly after reseting Atmega328p board.\r\n","comments":3,"title":"max step frequency of GRBL Atmega328p","updated_at":"2011-10-16T03:54:05Z","url":"https://api.github.com/repos/simen/grbl/issues/41","id":1897551,"assignee":null,"milestone":null,"closed_at":null,"user":{"gravatar_id":"33ea84dd07aae5e8edb349a4710f1115","avatar_url":"https://secure.gravatar.com/avatar/33ea84dd07aae5e8edb349a4710f1115?d=https://a248.e.akamai.net/assets.github.com%2Fimages%2Fgravatars%2Fgravatar-140.png","url":"https://api.github.com/users/pauljay","id":1064559,"login":"pauljay"},"html_url":"https://github.com/simen/grbl/issues/41","labels":[],"state":"open"},"legacy":{"issue_id":1897551,"comment_id":2418960}}