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Building XY-galvoscanners for laserengraving/3D-printing

Building XY-galvoscanners for laserengraving/3D-printing

Postby VDX » Sat Mar 01, 2014 4:26 pm

Hi all,

... cross-linking to some of my projects around laser-engraving/sintering with gantry-style CNC-mills and DIY-XY-galvoscanners - maybe here someone is interested too?

http://diy-community.de/showthread.php? ... talscanner

http://www.photonlexicon.com/forums/sho ... diode-head

Viktor
VDX
 
Posts: 260
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Re: Building XY-galvoscanners for laserengraving/3D-printing

Postby hunkatibor2 » Sun Mar 02, 2014 11:49 am

Intel Xeon E5410 2.33GHZ 16GB RAM Windows 7 64bit David 4.5.0
2 Basler A622F camera 2 Tamron Asfirical AF 28-80mm lense
LG DLP Projector PF1500G Canon D40 Tokina 17-70mm 1:2.8-4,5
Humanti Calibration panel system and Alignmed&Two camera
hunkatibor2
 
Posts: 1408
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Location: Hungary

Re: Building XY-galvoscanners for laserengraving/3D-printing

Postby VDX » Sat Mar 15, 2014 10:03 pm

... I've found, that with the pretty small scanner-mirrors on the show-laserscanners the max. laser-power I can use is around 5Watts NIR - when applying more and/or with a longer pulsing time, to get higher average power on the target, the mirrors get hot and start to degrade!

Thinking about changing the holding bracket to allow 3xbigger mirrors, so I can use a beam-expander to reduce the energy density on the mirrors surface ... or switch to stepper- or servo-motors as the scanning speeds I'm applying are much slower than used with show-lasers ... and could be even more precise in angular accuracy ...

Viktor
VDX
 
Posts: 260
Joined: Wed Jul 04, 2012 1:35 pm

Re: Building XY-galvoscanners for laserengraving/3D-printing

Postby VDX » Wed Apr 09, 2014 8:05 pm

... for 'scanning' with a 120Watt fiberlaser I'm building a system with 40x40x6mm mirrors and servo-motors instead of galvos.

The servos are much slower than galvos, but could be same time needed for a job -- as with the galvos and short pulsing (due to the small/weak mirrors) I had to set 10x to 50x pulses on a dot before it was marked :?

I'm estimating around 0.3s for scanning a complete line with maybe 30000 pixels/dots, that could be a working size from 100mm to 300mm, depending on focal distance ...

Here an image of the 'scanner' body:
XY-Servo1.jpg


Viktor
VDX
 
Posts: 260
Joined: Wed Jul 04, 2012 1:35 pm

Re: Building XY-galvoscanners for laserengraving/3D-printing

Postby hunkatibor2 » Fri Apr 11, 2014 8:35 am

Intel Xeon E5410 2.33GHZ 16GB RAM Windows 7 64bit David 4.5.0
2 Basler A622F camera 2 Tamron Asfirical AF 28-80mm lense
LG DLP Projector PF1500G Canon D40 Tokina 17-70mm 1:2.8-4,5
Humanti Calibration panel system and Alignmed&Two camera
hunkatibor2
 
Posts: 1408
Joined: Tue Mar 16, 2010 4:26 pm
Location: Hungary

Re: Building XY-galvoscanners for laserengraving/3D-printing

Postby VDX » Fri Apr 11, 2014 8:44 am

... if I'll use the 120W-fiberlaser or one of the pulsing lasers with 800mJ/8ns-pulses for data communication across a longer distance, then insects or birds crossing the beam could receive serious damage :lol:

Viktor
VDX
 
Posts: 260
Joined: Wed Jul 04, 2012 1:35 pm

Re: Building XY-galvoscanners for laserengraving/3D-printing

Postby VDX » Sun Apr 13, 2014 8:53 pm

... here the stage preassembled without focussing lens and laser-head not inserted (the shiny cylinder with yellow armored tube at the bottom):

Stellprobe1_kl.jpg


Viktor
VDX
 
Posts: 260
Joined: Wed Jul 04, 2012 1:35 pm

Re: Building XY-galvoscanners for laserengraving/3D-printing

Postby VDX » Thu May 15, 2014 11:47 am

... got it moving with a reconfigured CNC-software (Editasc with 2 axes instead of 3-8 as common)!

Attached a video where I've tested it with 'moving focus' speeds of up to 200mm/s at the 'target' in around 200mm distance ...

http://vimeo.com/95379146
VDX
 
Posts: 260
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Re: Building XY-galvoscanners for laserengraving/3D-printing

Postby VDX » Fri May 16, 2014 5:05 pm

... first test with laser at 20 Watts, 100µs pulsing time:

https://vimeo.com/95512748

Tested with 80 Watt and 200µs pulse-time (50% PWM ratio) ... the mirrors survived, but this was no duration test ... with 40 Watts CW they will degrade :?

Viktor
VDX
 
Posts: 260
Joined: Wed Jul 04, 2012 1:35 pm


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