Hello,
Would it be possible to drive a laser galvo head (for marking) with Mach & Grex.
Galvo heads are typically controlled using an analog voltage, wich directly relates to a position in its working field (eg 180x180mm - 7x7 inch)
What i will do is create an electronic circuit wich has a counter(connected to the step en direction outputs), who's value is connected to a 16 bit D/A (one for each axis).
Since this galvo heads normally use linear control AND jumps, i will need a Grex, because of the speeds involved (in relation to its smallest step -about 2.75 µm).
Normally jump speeds from 700 to 1000 mm/s are used, with uncontrolled acceleration. So if i just go to linear movement, with very high puls rate (400kHz), it could be considered a jump. Writing speeds are lower (and linear).
I believe that my idea can work but there are some problems. There need's to be some pause times after positioning. After all, it is an open loop system, so mach or Grex, don't know actual positions.
Wich brings me to my question.
What are the smallest delay times that are supported in such a setup. Can i use G4 to dwell, or do i need to write some plugin to support this stuff ?
I need delay times that are in the range of 10 to 10000 µs.
Any suggestions?
Do you want to have me committed?
Kris.