Messages

1

LaserBoy !!! / Re: Galvo/Ilda Basics

« on: June 30, 2015, 11:03:54 am »

Hi James


Thanks for the detailed explanation, absolutely fascinating stuff!!


>> As the rotor is approaching that position the amp juices the coils in the opposite direction.....  not in the position indicated by the input to the scanner amp


ahhh....position encoder feeds back to amp .... so galvo scanner amp boards are a special kind of amp? I can see I have a lot to learn, will focus on getting my pc sound card right and start playing.




Cheers
Bruce

2

LaserBoy !!! / Galvo/Ilda Basics

« on: June 10, 2015, 11:12:36 am »

Greetings from London!!

Just found laserboy while searching google for a "dxf to ilda" converter…..big thanks to James for Laserboy, I downloaded and compiled (on Fedora 20) in 5 min, couldn't ask for an easier "blooding". I did have to "yum install" some boost but otherwise it all just worked, very cool.

I'm starting out with arguably the worlds cheapest setup:
http://www.ebay.co.uk/itm/301170779843
and a standard $15 green laser "pen stick" I bought from some guy who was selling them on a pavement in Turkey.

So now I need some help understanding some fundamental basics about galvo scanners, perhaps a member could correct the little I've learned so far
 
 1. Galvo scanner receives a linear signal to drive a coil...similar to a speaker
 2. The amplifier boards simply amplifi the linear signal to drive various sized glavos
 3. Laserboy software can convert a DXF file (lets say a tooth path) in a linear signal and write it as a wav file
 4. To control the galvo, connect your sound out to amplifier boards and write your wav file to your sound card


...how do you calibrate the WAV generation to the galvo?
 
 
 ...and now I'm lost ...where does Ilda come in? In my setup, I guess I can replace the logic board with a raspberry pi connecting the audio out to the two amplifier boards I got with my starter kit?
 
 
 My focus/interest is material processing, both hobby and commercial.
 
 
 Cheers
 Bruce