Since my "deal" on the Sanyo-Denki closed loop stepper motors and drivers is a bust*, I'm still hunting motors and drivers at an affordable price. (Which right now is as much under $1,000 as I can get.)
After spending hours looking, it appears that nothing under a NEMA34 size is going to do the job of moving around a 10x50" mill table at any decent speed. What I'm running into a lot are servo motors that the only spec listed for power is Watts, or if there's a torque value it must be running torque, usually below 1 newton-meter which seems ridiculously low for the size of motors. The benchmark I want to at least meet is what the old brush type DC motors were, 3NM peak torque. Is a 100W or 200W AC or BLDC roughly equivalent? There's a person or company in Hong Kong selling kits with drivers, motors, all the wiring, connectors, limit and e-stop switches and even a cheap looking BOB at my price point or below - but I don't know if the motors are even as powerful as the old motors that were on the mill. The seller even supplies instructions and setup software in English. (The cheap BOB would get it going but I'd want to upgrade that.) Sure would be nice if this entire industry would just pick ONE method of measuring motor power, or even use two or three all the bleeping time, or at the least specify *both* peak and running torque. Instead some have just running torque, some only peak, some only stall, some only Watts and a large number that I couldn't find any specifications at all - unless they're buried in an Asian language datasheet. * Missing control wires and connectors that Sanyo-Denki wants $88 *each* for and two motors missing encoder wires and none of the drives will go into test mode even though the display shows no error condition with a motor connected. Also not impressed with Sanyo-Denki's technical support that had no clue what might be causing that. "Removed from working equipment" my arse! Getting sent back for a refund. ------------------------------------------------------------------------------ Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58040911&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
