On Sat, Aug 16, 2008 at 01:53:04AM -0400, Sergey Izvoztchikov wrote: > Anyone has experience with this board ? Is it known product or new > board ? Any pros and cons ? Is is going to work under EMC2 control ? > Would it be a good choice for Sherline Mill CNC retrofit ? > > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=230280442519&ssPageName=STRK:MEWA:IT&ih=013
The driver's datasheet does not specify the timings required for step length, step space, direction setup, and direction hold. The driver is unipolar, which gives lower performance (speed/torque) than bipolar. The motors you mention can be used with either a bipolar or unipolar driver. The use of open-loop current control is uncommon in stepper motor drivers. The tuning procedure does not show how to ensure that the stepper motor ratings are not exceeded. (On current-feedback designs there is a direct relationship between a reference voltage and the current limit) I don't like that the driver turns off after 30s. When the controller says the motor should be energized, it should be energized and holding position. In threads from 2006 through today, many people had trouble setting up this board with various other control software http://www.cnczone.com/forums/archive/index.php/t-23341.html http://www.cnczone.com/forums/archive/index.php/t-36386.html http://www.cnczone.com/forums/archive/index.php/t-55312.html Jeff ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users