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ldgraphy [2020/11/07 11:46] – yairldgraphy [2020/11/11 02:10] (current) – yair
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 first go\\ first go\\
 {{ldr-003.mp4}} {{ldr-003.mp4}}
 +
 +
 +===TODO===
 +find out what's up with the Y axis galvo. it gets very hot when on and doesnt move. 
  
 ===hardware=== ===hardware===
 Shih [[http://tribe-against-machine.org/wiki/tiki-index.php?page=Maskless_Photolithography_with_Conductive_Fabric_and_DIY_Laser_Galvanometers|notes]], similar to [[https://github.com/hzeller/ldgraphy/blob/master/design.md|ldgraphy]] Shih [[http://tribe-against-machine.org/wiki/tiki-index.php?page=Maskless_Photolithography_with_Conductive_Fabric_and_DIY_Laser_Galvanometers|notes]], similar to [[https://github.com/hzeller/ldgraphy/blob/master/design.md|ldgraphy]]
  
-{{drawio>diagram1}}+ 
 +the scanner is PT-A40 
 + 
 +{{:pasted:20201107-143303.png?400}} 
 + 
 +{{:pt-a40.pdf|manual for PT-A40}} 
 + 
 + 
 + 
 +what's inside? 
 + 
 +{{youtube>HIBH55cbfLM?medium}} 
 + 
 +AlliExp stroe (not he one sent)- https://gzsevenstarlight.aliexpress.com/store/3904033\\ 
 +pro ThorLAB - https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=3770 \\ 
 + 
 +**Basic Tuning**\\ 
 +Basic adjustments\\ 
 +The driver board comes already pre adjusted for 3 projection angle and needs to be set up for\\ 
 +the galvo only in small areas. Every galvo is different, so 3 of them adjustments are needed. For\\ 
 +this, the ILDA test pattern is used ,also a setup of the galvos in XY with a laser . If you need to\\ 
 +tune the driver faster to smaller angles, follow the procedure below . Also if the driver is totally\\ 
 +deadjusted , this will be the procedure to retune it : 
 + 
 +  * Size, Servo-Gain, Damping und HF-Damping are adjusted counter clockwise to their left zero position. Now turn LFD 5 full rounds clockwise to right. 
 +  * Connect computer with ILDA test pattern, run it at approx. 20kpps. 
 +  * Power on the amplifiers. 
 +  * Slowly open the **servo gain** (clockwise). The mirror of the galvo should move now to its middle position. If yes, turn two rounds clockwise. 
 +  *  Slowly open the **size** until you see the galvo moving. 
 +  *  Increase **servo gain** until you see overshoots. Correct it with **LFD**. 
 +  *  Decrease undershoots by opening the **HFD** pot slightly clockwise. Remove **gain/LFD** procedure and correct with **HFD**, until you the picture looks satisfying. Carefully fine tune the driver. The better your fine tuning is, the faster is the scanspeed. 
 +  * Increase speed of test patterns and readjust for optimized picture 
 + 
 +{{:pasted:20201107-194611.png?500}} 
 ===software=== ===software===
 [[https://gitlab.com/greenhouseinfo/max-svg-laser-cutter|greenhouseinfo/max-svg-laser-cutter]] \\ [[https://gitlab.com/greenhouseinfo/max-svg-laser-cutter|greenhouseinfo/max-svg-laser-cutter]] \\
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 maybe [[http://www.axoloti.com|axoloti]] if i had it.  maybe [[http://www.axoloti.com|axoloti]] if i had it. 
 +===diy=== 
 +{{:pasted:20201111-001008.png}} 
 +http://elm-chan.org/works/vlp/report_e.html