31
Show"N"Tell ( Your Machines) / Re: Yet another Retrofit. Hardinge HXL-S
« on: September 26, 2008, 07:53:06 PM »
I just can't seem to put this thing down at the moment, which I suppose is good. Though I'm determined to run a real job on the Hardinge this w/e.
Todays work has made that more practical. Yet another pcb made, this one interfaces with the PLC and also takes the DIYCNC Spindle2 board (Step/dir to Voltage converter) as a piggyback board. I haven't taken a picture yet as it's all still strewn over the floor in a test setup! But it all works, and I now have software control over the spindle.
I found that although the Siemens MM440 VFD I'm using as a spindle drive was all ok operated from it's keypad, but under analogue control I could ony get speeds upto 50Hz. A quick delve into the VAST manuals suggested the ADC input required scaling, and there are several parameters involved! After a lot of fiddling I have speeds upto 4000rpm and fairly linear. Linearity I will tune some more later. Upto about 1800 rpm it's always within about 10 rpm of commanded, but gains slightly at higher speeds, although always within 100 rpm.
Wayne.....
Todays work has made that more practical. Yet another pcb made, this one interfaces with the PLC and also takes the DIYCNC Spindle2 board (Step/dir to Voltage converter) as a piggyback board. I haven't taken a picture yet as it's all still strewn over the floor in a test setup! But it all works, and I now have software control over the spindle.
I found that although the Siemens MM440 VFD I'm using as a spindle drive was all ok operated from it's keypad, but under analogue control I could ony get speeds upto 50Hz. A quick delve into the VAST manuals suggested the ADC input required scaling, and there are several parameters involved! After a lot of fiddling I have speeds upto 4000rpm and fairly linear. Linearity I will tune some more later. Upto about 1800 rpm it's always within about 10 rpm of commanded, but gains slightly at higher speeds, although always within 100 rpm.
Wayne.....