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Messages - frasej

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1
Show"N"Tell ( Your Machines) / Re: Focusing an IR laser diode
« on: February 24, 2015, 11:39:13 AM »
I'm sorry, but it got tossed. Probably should have kept the power supply.  >:(

2
Show"N"Tell ( Your Machines) / Re: Focusing an IR laser diode
« on: February 19, 2015, 10:14:03 AM »
I never did get that particular laser to work properly. Eventually, I think, I over powered it and burnt out the laser.  >:( I did, however, end up using a 2.5 watt 450nm laser that worked quite well.  As I recall, PVC should never be cut with a laser for a couple of reasons; 1. The fumes are toxic. 2. The fumes can damage the lens of the laser.
You could use it to cut very thin acrylic, as long as it isn't clear acrylic.  For the clear stuff, you'd need a much higher powered laser, such as a CO2 40-50 watt laser. When using lasers to cut anything, always have plenty of ventilation, you never know what's going to give off toxic fumes.  :)

3
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: February 19, 2014, 04:06:12 PM »
I wrapped more tape around the threads of the lens and put it back on.  There is still a little wobble in the burn, but not nearly as much as before.  The lines don't seem to cross each other any more.  So it probably was just a loose lens.  I've never tried going perpendicular to the direction I was burning in.  I'll have to give that a go and see.

4
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: February 19, 2014, 09:54:39 AM »
Loose lens makes more sense.  I have it wrapped in Teflon plumber's tape but it is still easily moved.  I may need to add some more.  I hadn't thought of that, thanks.

5
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: February 19, 2014, 09:18:57 AM »
Eww, no.   All Chinese lead screws.

6
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: February 18, 2014, 06:56:12 PM »
Can anyone explain the following... Below are two images, one is an extreme closeup of the other image.  Notice that instead of straight lines, the lines appear to be wavy. This was burned onto balsa wood and I was wondering if it's the grain that is causing the waviness?

7
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: February 02, 2014, 12:04:48 AM »
Try craft foam.  The 2mm style cuts very easily with little to no charring.

8
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: January 28, 2014, 09:32:35 AM »
Looks incredible, and incredibly fragile.

9
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: January 27, 2014, 06:21:05 PM »
Didn't get a chance to attach the file.  Warning... Large file ahead.

10
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: January 27, 2014, 05:59:28 PM »
Finally got the Arduino to do the  laser power modulation.  ;D Did the usual Drew picture test:  http://www.flickr.com/photos/jayfrase/12180276666/
When blown up you can see that my spacing is a little off.  Used PEP and had the spacing set at 0.009.  I tried it at 0.007 but got overlapping lines.  Guess I should have used 0.008.  Oh well, that's for next time.
The one problem I'm still having is the Arduino is getting off by the end of the print.  The file said the power level should have been 98 and the Arduino said it was 70.  Low by 18 steps.  I'm not sure why this is happening.


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