Tuning the scanners

[h2so4]

the circle looks more like an ellipse and i don't seem to find a way to adjust it...

[whiteg]

Hi

I already retuned my scanner. I have waving problem.
You can see in the attachement.
Have anybody tip for it what cause this?
Isn't it possible that's it an electronic interference?

thanks!

whiteg

[rfourt]

Buffo,.. thnx alot for your explonation.. really helped out.

Why we where running it at 10K was to work our way up

Now we have kind of a descent ilda testpattern at 30K, i would guess about 1-2 hours left on tuning then it will be great.

Tocket
That would be really cool. although i have it in my work now and i cannot invite ppl into the work. some rules we have their.

Although i got the profiles for the box/casings im building for it so i should have it ready within a month i hope. Easier to bring the whole box with everything attached instead of everything in parts. Therefore im going to start focusing on the box and the combining of the 150Blue rays now. But i will let you know when its all finished and all alignment etc is done and then get back to tuning the scanner.

Thnx again for the help ppl.

[whiteg]

Hi

Upload photo, please.

whiteg

Buffo,.. thnx alot for your explonation.. really helped out.

Why we where running it at 10K was to work our way up

Now we have kind of a descent ilda testpattern at 30K, i would guess about 1-2 hours left on tuning then it will be great.

Tocket
That would be really cool. although i have it in my work now and i cannot invite ppl into the work. some rules we have their.

Although i got the profiles for the box/casings im building for it so i should have it ready within a month i hope. Easier to bring the whole box with everything attached instead of everything in parts. Therefore im going to start focusing on the box and the combining of the 150Blue rays now. But i will let you know when its all finished and all alignment etc is done and then get back to tuning the scanner.

Thnx again for the help ppl.

[h2so4]

I've somehow managed to tune the scanners at an acceptable level and after 2 days of almost continuous working (yes, no sleep - I'm not new to it at all...) I'll stick with it, as for beam shows it works just great. The test pattern is correctly displayed (20k at ~8°) exception made for the square corners, which look like nodes and can't be corrected with either LFD or HFD...But I'm happy with this now...

All the best!
Giovanni

[whiteg]

I read somewhere that these laserword scanners can display frames nicely on 21K pps. May that's the cause, that I'm trying and I can't tune my scanner on 30K pps.
I would like to ask, which value need I set the corner repeat, the blanking shift, end point and start point parameters in software before I start tuning? Need I set them to 0 or use that values what I want?

I have three test patterns: ilda test for 12K, ilda test for 30K and laser media. Which pattern do I use if I would like to tune the scanner at 30K?

I already upload some picture with wavy lines. I realized, it depend on how long the line. When I scale the line, the waves always change. Sometimes they are bigger, sometime smaller. And I already asked, that should it cause by interference. Could anybody know the answer for it? And if it's an interference how can I resolve that?

Thanks,
Whiteg

[mccarrot]

I have also 2 sets of those scannes, on both you can see some minor waving on some lines.
I beleive this is because the cheap thin chinese mirrors are bending a little bit.
I did not had the chanche to test better quality mirrors.

[James Lehman]

The answer lies in what Dean C. Hammonds says about it.

He is The Ultimate Calibrator.

James.

[buffo]

Sorry for the late reply folks - been out of Internet range for the last week and a half.

Sounds like the problems described above are related to the quality (or lack thereof) of the LaserWorld scanners themselves. Sometimes you can't get the test patterns to display perfectly, especially if you have cheaper scanners.

In this case, you may already be getting all you can get from those scanners. Thin mirrors can introduce resonance, which will give you wavy lines. Flimsy position detectors can introduce errors in the feedback signal, which can cause the scanned image to drift around a bit. (Often times "snapping back" to the home position from time to time before starting to drift again.) And cheap scanner amps can introduce noise and distortion that will cause the test patterns to look messy.

However, there are a few things you can try. First: if your controller has differential outputs (that is, an X+ and an X-, not just X+ and ground), then do *not* ground the signal ground pins on the scanner amp inputs. Just connect X+ to X+ and X- to X- (and the same for the Y amp), and leave the signal ground (the pins between X+ and X-) disconnected. Now see if the wavy lines have gotten any better.

Second: make sure your projector and control computer are plugged into the same outlet or power strip.

And finally, if your scanner mirrors are *very* thin, consider either replacing them with thicker (and thus stiffer) mirrors, or artificially stiffening the mirrors by adding a thin layer of epoxy to the back of the mirror. Note that doing either of these two things will force you to have to re-tune the amps, since you'll be changing the mass on the rotor.

Adam

[Insanity]

I have just finished fine tuning my Laserworld scanners. I found them to be very sensitive and only need very minor adjustment to really change the pattern...It has taken a very long time, but you can get them pretty good...

Photo's are 8 degrees @30k... Still not perfect, but they have no problems with graphics or text..

Mark