Gene, I think I understand now
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On Fri, Sep 16, 2016 at 6:07 PM, Gene Heskett <ghesk...@shentel.net> wrote: > On Friday 16 September 2016 12:06:47 Chris Albertson wrote: > > > Lead screw is a 1605, 40 tooth gear on the motor by way of a taperloc hub > I made, ditto for the 80 tooth gear on the screw, so the motor is > running 2x the speed of the screw. The motor is running on a 39 volt > power supply, with a 2M542 driver set for 16x microstepping. Motor is an > 8 wire 432 oz/in, wired in series. I am useing a similar if not > identical, direct drive on the smaller x screw, wired parallel. It > doesn't move very far, maybe 4" total, but its speed for in and out > running a g76 threading routine is way more than enough. > So 200 x 16 x 2 steps per revolution is 6400. then 6400 x 5 steps per inch is 3200 at 60 inches per second you are doing 380,000 steps per second or, that is 2.6 microseconds per step. I am very surprised at the low performance of the opt coupler in the breakout board unless it was intentional. The signal might be intentionally low pass filtered in an attempt to reduce noise. That would be a reasonable design for a breakout board. The designer never assumed anyone would would run steps at 300KHz. To move 60 IPS coins software I think it looks like I might need a direct drive using 1/2 steps for 400 steps per revolution. But I'd be at only 2,000 steps per inch Yes I see the logic in using the FPGA board, plus I've always wanted to learn to program an FPGA and when not driving a machine tool I'l have one to play with > When asking steppers to run at those speeds, I think 2 things are > > demanded: > .... > -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
