PS: Yadda mentioned torsion-bar scanners being broken by people playing with them... Interestingly, DZ and I had a discussion about this recently. He's been using G120s with Turbo-Track amps for quite a while now, and the output is flawless (largely due to those awesome amps). But then I asked him what happens when the torsion bar breaks. To find out, he dug out an old set of G120s that had broken torsion bars and hooked them up. Amazingly, they still scanned the ILDA test pattern correctly! I don't remember what the scan angle was (likely less than 8 degrees), but it sure looked good to me... My guess is that at wider scan angles there would be problems though.[/QUOTE]
~
Yeah, Turbotracks will do that with the G120. Nothing else I'm aware of can.
Torsion bars are nitinol in some cases, and spring steel in others. Galvos used to be so expensive that I would press the G120 shaft out and silver solder or braze a new T-bar in. Repositioning the shaft then takes an hour with the O'scope. Then they redesigned the lower bobbin to make a one piece assembly and that did not work any more.
~
----------------------------------
If you have a proper bench, a good Bench PSU set with programmable current limiting , a scope, a good signal generator, a Pangolin setting there, the manual, and patience, tuning from scratch is not that difficult for a trained ET.
~
Thinking you can just waltz in and twiddle knobs however will result in loosing money. It is like learning to fly a plane. You have to break your pre-conceptions, forget much of what you learned on the PC Flight Simulator, and look at the procedures and instruments. This won't make a good Youtube video either, too easy to loose your place talking and tweaking at the same time.
~
Steve
Qui habet Christos, habet Vitam!
I should have rented the space under my name for advertising.
When I still could have...