targets

General Laser Usage Topics
pierre dradin
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Joined: Sun Oct 30, 2016 7:50 am
Location: Baillonville, Belgium
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targets

Postby pierre dradin » Thu Dec 29, 2016 10:54 am

I used the file MK6, I modified it, my machine is bigger and I had no 3mm but 5mm, I added a lens, to have a focal point as small as possible, and See if I was in the center, right bingo without the lens, left with the lens

Image
LT1290, 1200*900 100w Beijing EFR laser tube,
before leetron 6585 and lasercut 6.1 and now Ruida 6442 DSP RDWorks v8.01.18
cnc home made 750*560 350kg, Galaad, kress 1050
http://www.decoupecnc.be
Pierre dradin

Dustin Hawkinson
Posts: 142
Joined: Sat Nov 19, 2016 4:55 pm
Location: Phoenix, AZ USA

Re: targets

Postby Dustin Hawkinson » Thu Dec 29, 2016 12:31 pm

That is an amazing idea!
40W (ebay 50W blue wonder), 300mm x 500m, TL
Windows10 RDW 8.01.19
(The member formerly known as astral)
-Dustin

pierre dradin
Posts: 24
Joined: Sun Oct 30, 2016 7:50 am
Location: Baillonville, Belgium
Contact:

Re: targets

Postby pierre dradin » Thu Dec 29, 2016 12:35 pm

Attention, just to confirm, not for the setting
LT1290, 1200*900 100w Beijing EFR laser tube,
before leetron 6585 and lasercut 6.1 and now Ruida 6442 DSP RDWorks v8.01.18
cnc home made 750*560 350kg, Galaad, kress 1050
http://www.decoupecnc.be
Pierre dradin

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fred ungewitter
Posts: 224
Joined: Tue Aug 16, 2016 12:55 pm
Location: East Central FL, USA

Re: targets

Postby fred ungewitter » Thu Dec 29, 2016 1:05 pm

Is the lens you have in the holder a plano-convex lens? If so, is the flat side on the target side or the beam side?

Even more important, what effect does the collimation aspect of the lens, if it is a plano-convex, have on the location of the beam?

Image

In the image above, the ray lines would indicate that a beam entering the lens within a certain radius of center will terminate, when properly focused, at the center.

As your "before image" shows that the burn is nicely centered, one would expect that the focused/collimated burn would also be well centered. I suspect that you could intentionally mis-adjust the beam and yet have it strike the target center.

The collimating lens in the nozzle provides just that aspect to our lasers. Within a small radius, a misaligned beam will still properly focus and provide suitable power.
fred

Redsail clone 60w 700 x 500
home upper right
RDWorks 8.01.18
Windows 7

Emblaser A3 4w diode laser
BCN3D Sigma Dual Extruder 3d printer
LMS Mini-mill
Cube 3rd gen 3d printer (works great, for sale)
Under construction: OX CNC 1000x750 router - out of the box, still in baggies!

pierre dradin
Posts: 24
Joined: Sun Oct 30, 2016 7:50 am
Location: Baillonville, Belgium
Contact:

Re: targets

Postby pierre dradin » Thu Dec 29, 2016 1:20 pm

I have doubts about the reliability of the system, flat sides towards the target, I just used it to see the result, it is a 38mm focal lens, thank you
LT1290, 1200*900 100w Beijing EFR laser tube,
before leetron 6585 and lasercut 6.1 and now Ruida 6442 DSP RDWorks v8.01.18
cnc home made 750*560 350kg, Galaad, kress 1050
http://www.decoupecnc.be
Pierre dradin

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fred ungewitter
Posts: 224
Joined: Tue Aug 16, 2016 12:55 pm
Location: East Central FL, USA

Re: targets

Postby fred ungewitter » Thu Dec 29, 2016 1:35 pm

Based on your results, I'd say the reliability is good, as long as one takes the collimation into consideration.

I'm sure many of us here have had the pleasant experience of seeing a burn spot-on the correct location, as yours did.

Even the old fellow Russ recently spoke out the letters O-M-G in surprise at seeing his burn in nearly the right location, in a recent video. It was pretty funny to hear him speak like a teenager.
fred

Redsail clone 60w 700 x 500
home upper right
RDWorks 8.01.18
Windows 7

Emblaser A3 4w diode laser
BCN3D Sigma Dual Extruder 3d printer
LMS Mini-mill
Cube 3rd gen 3d printer (works great, for sale)
Under construction: OX CNC 1000x750 router - out of the box, still in baggies!

Dustin Hawkinson
Posts: 142
Joined: Sat Nov 19, 2016 4:55 pm
Location: Phoenix, AZ USA

Re: targets

Postby Dustin Hawkinson » Thu Dec 29, 2016 1:40 pm

Interesting point Fred. My first thought was to intentionally clip the beam, but you would need to know exactly where it is pointed to do that, so it would be pointless in beam alignment.

Russ's latest video is a little disparaging in that he discovers the beam is actually putting out some power in a much larger diameter pattern than I expected. I think we are going to continue to see some decent loss of power regardless of alignment and mirror efficiency unless we start using much larger mirrors and lenses.
40W (ebay 50W blue wonder), 300mm x 500m, TL
Windows10 RDW 8.01.19
(The member formerly known as astral)
-Dustin

pierre dradin
Posts: 24
Joined: Sun Oct 30, 2016 7:50 am
Location: Baillonville, Belgium
Contact:

Re: targets

Postby pierre dradin » Thu Dec 29, 2016 1:52 pm

LT1290, 1200*900 100w Beijing EFR laser tube,
before leetron 6585 and lasercut 6.1 and now Ruida 6442 DSP RDWorks v8.01.18
cnc home made 750*560 350kg, Galaad, kress 1050
http://www.decoupecnc.be
Pierre dradin

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Keith Sherwin
Site Admin
Posts: 1000
Joined: Fri Jun 24, 2016 1:44 pm
Location: Okanagan Valley, B.C. Canada

Re: targets

Postby Keith Sherwin » Thu Dec 29, 2016 1:58 pm

fred ungewitter wrote:It was pretty funny to hear him speak like a teenager.

Russ is a teenager (with manners) trapped in an older persons body. :lol:
69 Real (80)Watt Laser w/multi FL lenses. T.L.
Made 5 CNC's, Electronics, Electrical, PLC & Computer background.
:idea: Started this forum - Using RDWorks V8.01.21 on W7 Pro
Lead in creation of the RDWorksLab English Manual.
Crazy Uncle Keith!

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fred ungewitter
Posts: 224
Joined: Tue Aug 16, 2016 12:55 pm
Location: East Central FL, USA

Re: targets

Postby fred ungewitter » Thu Dec 29, 2016 4:19 pm

Great video, even or perhaps especially due to its brevity. I like the appearance and the solid engagement shown when you move the brackets into place.

One thing I think the membership/ownership should note is that some of what Russ espouses applies only to his machine or clones of that design. For example, his coverage of the off-center location of mirror 3 does not apply to my redsail clone. I checked the positions of the mirror and aiming apertures and found that the center of the opening matches the center of the mirror, unlike the offset mirror his laser uses.

Russ' latest video showing him removing mirror one assembly really clarifies one of the differences. I can remove my mirror by removing the retainer, without touching any adjusters, unless by accident. By replacing the mirror with paper targets, I can also ensure that the red dot or the laser pulse is striking on the plane of the mirror and not on an offset location.

I downloaded Russ' target assembly, mostly because such drawings are fascinating. I suspect if I wished to implement his system, I'd consider to re-design the target "circles" or ellipses that make up his design. Due to the offset his number three mirror engages, his ellipses are squished more on the top than a centered mirror/centered aperture/centered lens design might be.

At the very least the center of his targets should be matched to the center of your mirrors (you, in the general sense, not a specific individual) before securing everything.
fred

Redsail clone 60w 700 x 500
home upper right
RDWorks 8.01.18
Windows 7

Emblaser A3 4w diode laser
BCN3D Sigma Dual Extruder 3d printer
LMS Mini-mill
Cube 3rd gen 3d printer (works great, for sale)
Under construction: OX CNC 1000x750 router - out of the box, still in baggies!


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