4. Laser beam adjustments

Very Large Laser Beds
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Gene Uselman
Posts: 1771
Joined: Thu Jul 07, 2016 3:18 pm
Location: Suburban Minneapolis, Minnesota, US
Country: USA
Nickname: Gene
Laser Machine Make or Type: AKL1318-2
Laser Power: 130W & 80W Reci
Laser Bed Size: 51 x 71
Home Position: TR
Control Software: LIGHTBURN
RDWorks Version: RDw .19 & Lightburn
Ruida Controller: RDC6445
Accessories: I have a combining lenses, pin tables [homebuilt], honeycomb tables , wireless remote, Modifed Ultimate Air Assist, home built non-powered rotary device, Prusa i3 MK3S and Mini Prusa printers.
Windows Version: Win 10 Pro

4. Laser beam adjustments

Post by Gene Uselman »

Laser beam adjustment

4. Combining lenses and red LED adjustments- LObject brkt and combining lens between the tube and #1 mirror. this is a real help with beam alignment IMHO. This pict is the combining mount and lens and also a new 'Peep' hole mentioned in 4.1.1
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1318-2_Peep-Combine.jpg


4.1 Mirrors/lens adjust problems- the larger the bed... the larger the problems. I switched to MO type mirror which are better able to handle the higher power tubes and more robust. I am still struggling with the alignment- I just noticed Russ' video Tan tiger #17- 'fourth corner problem' which may be what I am going around and around trying to cure.

4.1.1 Camera to see Mirror 2 at rear of travel- this does work but a lot of trouble. I used a large [3-4"] hole saw and cut a view hole in the bulkhead [which will be covered in normal operation]. I am working on getting the beam from mirror #1 to #2 perfectly level and shimming the #2 upward and adj in and out [provided in the bracket] to get the best alignment front to rear that I can manage. The hole I cut is large enough to reach thru and change targets on #2 mirror which really facilitates this adjustment. Much better than the camera setup... this is how we learn.

4.2 Targets for Mirrors 1 and 2 and target for Mirror 3 [replaces the mirror in the cutting head.
These are pictures of the targets- they are different sizes to fit the mirror blocks on my machine- the ovals are the actual sight pictures of the mirrors to correct scale- engraved and cut from .020 cardstock and covered with a double layer of 1" application tape- you can still see the target ovals. I also cut a bunch of 25mm circles to replace the mirror in the head and had the 'tunnel' into the mirror bored out when I was trying [fruitlessly] to align the original Reci W6 tube with the bad beam pattern. I glued a screwdriver bit into the mirror plug for easy access. I had only a mm or so excess mirror as the beam was so large. The grid type target is what I am using to attempt to resolve the 'Fourth Corner Problem' that Russ touched on- turns out that the larger the bed... the worse it gets.

.
1318-2_Targetsl.jpg
1318-2_Headl.jpg
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BT48 Alpha Shopbot and 1300x1800 130W Laser

The days that I keep my gratitude higher than
my expectations, Well, I have really good days.

Ray Wylie Hubbard
User avatar
Gene Uselman
Posts: 1771
Joined: Thu Jul 07, 2016 3:18 pm
Location: Suburban Minneapolis, Minnesota, US
Country: USA
Nickname: Gene
Laser Machine Make or Type: AKL1318-2
Laser Power: 130W & 80W Reci
Laser Bed Size: 51 x 71
Home Position: TR
Control Software: LIGHTBURN
RDWorks Version: RDw .19 & Lightburn
Ruida Controller: RDC6445
Accessories: I have a combining lenses, pin tables [homebuilt], honeycomb tables , wireless remote, Modifed Ultimate Air Assist, home built non-powered rotary device, Prusa i3 MK3S and Mini Prusa printers.
Windows Version: Win 10 Pro

Re: 4. Laser beam adjustments- adj head mount

Post by Gene Uselman »

I got one of the Russ design laser head mounts from Cloudray- knew my head would not fit but I had a smaller one from a couple years ago that I thought would... it is different from the CR 'C' style head [smaller mirror]. So I built an adaptor brkt to use the main adj brkt and mount my [substantially] larger head from .22 and .115 acrylic [the part facing the laser beam has alum foil mounted to it it protect it]. All good so far, does anyone have an idea what the 'tongue' is for that my arrow is indicating? It interferes with the larger head and I will just bend it down unless I need it.

.
Laser head adj mount.jpg
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If the Help and advice you received here was of VALUE...
Please consider making a donation to maintain the RDWORKSLAB Forum.

BT48 Alpha Shopbot and 1300x1800 130W Laser

The days that I keep my gratitude higher than
my expectations, Well, I have really good days.

Ray Wylie Hubbard
Rodney Edington
Posts: 91
Joined: Wed Feb 24, 2021 12:38 am
Location: Leavenworth Ks
Country: USA
Nickname: Rodney
Laser Machine Make or Type: K 40 Building a 22"X 38"
Laser Power: 60 watt
Laser Bed Size: 22"X38"
Home Position: TL
Control Software: RDWORKS
RDWorks Version: NA
Ruida Controller: RDC6445
Windows Version: 7

Re: 4. Laser beam adjustments

Post by Rodney Edington »

I think it will be OK to bend it down. It's probably there to protect the head from running into something.
Rodney

Here is my build
viewtopic.php?f=159&t=5526&start=20
Andrew Parry
Posts: 22
Joined: Fri Dec 20, 2019 5:18 pm
Location: Worcester
Country: United Kingdom
Nickname: andyspoo
Laser Machine Make or Type: Chinese Red/Black
Laser Power: 60w
Laser Bed Size: 730mm x 600mm
Home Position: TR
RDWorks Version: V8.01.44-191015
Windows Version: Windows 10

Re: 4. Laser beam adjustments- adj head mount

Post by Andrew Parry »

I believe the 'tongue' is designed to activate the home sensor on some lasers.
Gene Uselman wrote: Fri Apr 09, 2021 1:50 pm I got one of the Russ design laser head mounts from Cloudray- knew my head would not fit but I had a smaller one from a couple years ago that I thought would... it is different from the CR 'C' style head [smaller mirror]. So I built an adaptor brkt to use the main adj brkt and mount my [substantially] larger head from .22 and .115 acrylic [the part facing the laser beam has alum foil mounted to it it protect it]. All good so far, does anyone have an idea what the 'tongue' is for that my arrow is indicating? It interferes with the larger head and I will just bend it down unless I need it.

.Laser head adj mount.jpg
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