Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Laser Shows



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 06-13-2013, 12:31 PM #1
Junior Member
 
Join Date: Mar 2013
Location: Netherlands
Posts: 19
Rep Power: 0
dooiespons is a jewel in the roughdooiespons is a jewel in the roughdooiespons is a jewel in the rough
dooiespons dooiespons is offline
Junior Member
 
Join Date: Mar 2013
Location: Netherlands
Posts: 19
Rep Power: 0
dooiespons is a jewel in the roughdooiespons is a jewel in the roughdooiespons is a jewel in the rough
Default Galvo alignment

Hi,

My projector has a strange issue, the projected image is kind of rotated / skewed.
I had this with Mamba, and now that i have pangolin i got the same issue.

Pictures:

(Projecting a straight line)


(Projecting a square box)


(Projecting a test patern, should be square)

If it is of any help, i replaced the mirrors on the galvos, because they both broke.
I can kind of fix the output within quickshow, but i prefer to fix the hardware.

If anyone has experienced the same, or knows a solution, please let me know!


dooiespons is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 06-13-2013, 03:03 PM #2
pschlosser's Avatar
Class 2M Laser
 
Join Date: Dec 2012
Location: Santa Rosa, CA
Posts: 909
Rep Power: 65
pschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond repute
pschlosser pschlosser is offline
Class 2M Laser
pschlosser's Avatar
 
Join Date: Dec 2012
Location: Santa Rosa, CA
Posts: 909
Rep Power: 65
pschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond repute
Default Re: Galvo alignment

What does a circle look like? Is it elliptical?

My guess is your scanners need some tuning. I bought a used REKE RGB projector, and was seeing similar problems until I took the scanners through the tuning and calibration process.

http://www.skywise711.com/lasers/scanner/scanner.html

The scanner manual, linked above, describes the calibration procedure. When one changes a mirror on a scanner, the mass of the new mirror may be minutely different than the old one. As such, the scanner must be tuned to the mass of the new mirror.

Even crummy 12K scanners perform admirably when properly tuned.
pschlosser is offline   Reply With Quote
Old 06-13-2013, 09:13 PM #3
DJZ's Avatar
DJZ DJZ is offline
Class 2 Laser
 
Join Date: Aug 2008
Location: Florida
Posts: 265
Rep Power: 401
DJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond repute
DJZ DJZ is offline
Class 2 Laser
DJZ's Avatar
 
Join Date: Aug 2008
Location: Florida
Posts: 265
Rep Power: 401
DJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond repute
Default Re: Galvo alignment

You may want to check your wiring. What kind of cable are you using between your DAC and the projector? Is it wired pin for pin? Did you wire the inside of the projector? I can simulate the exact skewing by wiring +X to +X, -X to -Y, +Y to +Y and -Y to nothing.
DJZ is offline   Reply With Quote
Old 06-14-2013, 12:26 PM #4
Junior Member
 
Join Date: Mar 2013
Location: Netherlands
Posts: 19
Rep Power: 0
dooiespons is a jewel in the roughdooiespons is a jewel in the roughdooiespons is a jewel in the rough
dooiespons dooiespons is offline
Junior Member
 
Join Date: Mar 2013
Location: Netherlands
Posts: 19
Rep Power: 0
dooiespons is a jewel in the roughdooiespons is a jewel in the roughdooiespons is a jewel in the rough
Default Re: Galvo alignment

Im using a standard 10M ilda cable that came with my pangolin dongle and software, so that should be OK.
I think my wiring on the inside is indeed wrong, could you post a picture of your wiring?

Mine is like this:

1: X+ (red)
2: Y+ (white)
5: R+
6: G+
7: B+
14: X- (white and ground)
15: Y- (red and ground)
18: R-
19: G-
20: B-


I dont got pin 25 connected (ground) but i guess i should do that?
dooiespons is offline   Reply With Quote
Old 06-14-2013, 12:30 PM #5
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 3157
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is offline
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 3157
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: Galvo alignment

Your X- and Y- inputs should be independent signals, not tied to ground, and not tied to other signals. They're not ground reference points, but rather X+/X- are differential inputs. See if that helps.
__________________
You must spread some Reputation around before giving it to <person> again.

Last edited by Bionic-Badger; 06-14-2013 at 12:31 PM.
Bionic-Badger is offline   Reply With Quote
Old 06-14-2013, 12:36 PM #6
Junior Member
 
Join Date: Mar 2013
Location: Netherlands
Posts: 19
Rep Power: 0
dooiespons is a jewel in the roughdooiespons is a jewel in the roughdooiespons is a jewel in the rough
dooiespons dooiespons is offline
Junior Member
 
Join Date: Mar 2013
Location: Netherlands
Posts: 19
Rep Power: 0
dooiespons is a jewel in the roughdooiespons is a jewel in the roughdooiespons is a jewel in the rough
Default Re: Galvo alignment

Thanks for the fast reply, i'll try it immediatly!
And should the ground reference of the galvo inputs be tied to pin 25 or not?
dooiespons is offline   Reply With Quote
Old 06-14-2013, 01:55 PM #7
DJZ's Avatar
DJZ DJZ is offline
Class 2 Laser
 
Join Date: Aug 2008
Location: Florida
Posts: 265
Rep Power: 401
DJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond repute
DJZ DJZ is offline
Class 2 Laser
DJZ's Avatar
 
Join Date: Aug 2008
Location: Florida
Posts: 265
Rep Power: 401
DJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond reputeDJZ has a reputation beyond repute
Default Re: Galvo alignment

May I suggest that you take some time to completely read and understand this article: Laser Show Resource Guide - Projector Connections article - Pangolin Laser Systems

It should answer your questions and help you to properly wire your projector so that you get the best possible output.

Quote:
I think my wiring on the inside is indeed wrong, could you post a picture of your wiring?
Sure, but I don't think that's going to help ya!
Attached Thumbnails
Galvo alignment-123.jpg  
DJZ is offline   Reply With Quote
Old 06-14-2013, 03:16 PM #8
pschlosser's Avatar
Class 2M Laser
 
Join Date: Dec 2012
Location: Santa Rosa, CA
Posts: 909
Rep Power: 65
pschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond repute
pschlosser pschlosser is offline
Class 2M Laser
pschlosser's Avatar
 
Join Date: Dec 2012
Location: Santa Rosa, CA
Posts: 909
Rep Power: 65
pschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond repute
Default Re: Galvo alignment

The elliptical question still stands. It may also be that your two scanners are not centered in relation to one another.

Loosen the locking screw holding the scanners to the block (the block that holds them at 90 degrees to one another) just enough so you can rotate them in place.

Then, try projecting the square image, again. While projecting on the wall, rotate the X and Y scanners, one at a time, and see if you can correct the skewing that way. If you cannot, you may need to recalibrate them.

The fact that your square displays as a diamond suggests to me you are almost there. And being almost there tells me it isn't your wiring. It is hard to imagine incorrect wiring would display an image that is close. I would expect the image to be way, way off if the scanners were connected incorrectly.

Another point: Your first image showing the line at a 30 degree angle. If it is your expectation that line is supposed to be horizontal, and if that is true, again, you may need to rotate your scanners within the scanner block to correct.

Bear in mind, the placement of those scanners within the scanner block is not some super-accurate setting you need to be afraid of screwing up. On one of my Chinese projectors, the center point of the projection was skewed upward and to the left of the projector by 15 degrees. I adjusted the center point of the projected image, so it was exactly in front of the output point of the projector by rotating the scanners within the block.

Last edited by pschlosser; 06-14-2013 at 03:18 PM.
pschlosser is offline   Reply With Quote
Old 06-15-2013, 12:06 AM #9
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 3157
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is offline
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 3157
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: Galvo alignment

Quote:
Originally Posted by dooiespons View Post
Thanks for the fast reply, i'll try it immediatly!
And should the ground reference of the galvo inputs be tied to pin 25 or not?
I wouldn't tie the ground signal pin of the galvos to anything; that is the general practice with galvos because they rely on differential inputs. Just leave the ground disconnected. The power supply may have a ground, but don't bother connecting that to anything else besides the galvo it is supplying. Remember: you don't need a ground reference with galvos.

Oh yeah, and watch out what you're projecting at. Those drawer handles can reflect light into your eyes.
__________________
You must spread some Reputation around before giving it to <person> again.

Last edited by Bionic-Badger; 06-15-2013 at 12:11 AM.
Bionic-Badger is offline   Reply With Quote
Old 06-17-2013, 01:12 PM #10
Junior Member
 
Join Date: Mar 2013
Location: Netherlands
Posts: 19
Rep Power: 0
dooiespons is a jewel in the roughdooiespons is a jewel in the roughdooiespons is a jewel in the rough
dooiespons dooiespons is offline
Junior Member
 
Join Date: Mar 2013
Location: Netherlands
Posts: 19
Rep Power: 0
dooiespons is a jewel in the roughdooiespons is a jewel in the roughdooiespons is a jewel in the rough
Default Re: Galvo alignment

Once i connected the galvo inputs the right way (like bionic badger suggested) everything works perfectly!
The scan angle is also a lot higher now, can't believe i was using my projector like this for almost a month
The galvo's still need some alignment though, when i project text, some straight angles are a bit round. But im sure i will figure that out with the tutorial that pschlosser posted
dooiespons is offline   Reply With Quote
Old 06-17-2013, 01:33 PM #11
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 3157
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is offline
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 3157
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: Galvo alignment

Good to hear it fixed your problems!

For the sharper straight angles, it might just be that those corners need more points in the vector file in order to slow down the galvo around them and make sharper angle transitions. Think of it like slowing down your car to make a right-hand-turn at a stop-light.
__________________
You must spread some Reputation around before giving it to <person> again.
Bionic-Badger is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On











Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 03:45 AM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC