Downgrade laser tube

If you have made Upgrades and/or Modifications to your machine, let us know about them here.
Alexis Tzoulis
Posts: 89
Joined: Thu Oct 06, 2016 5:03 pm
Location: Greece

Downgrade laser tube

Postby Alexis Tzoulis » Thu Jan 05, 2017 9:35 pm

I plan to downgrade my laser tube from 50w which has from factory to 40w because i need better quality in engraving granite.
My machine is ebay redsail x700 clone 60w(real 50w).
Should i change also power supply to a lower one 40w ?
KH-7050 60w (50w real) (700mmx500mm) redsail clone TR
Ruida 6442G controller - MYJG-60W power supply - 1000mm/50mm co2 tube
RDWorks V8.01.19 - corel draw x8 - windows 10
Alexis

Doug Fisher
Posts: 288
Joined: Sat Aug 20, 2016 10:42 am
Location: Atlanta, Georgia, USA

Re: Downgrade laser tube

Postby Doug Fisher » Thu Jan 05, 2017 10:25 pm

I doubt changing from a 50w to a 40w is going to make a difference. It would be more appropriate to think about doing this from a 100w to a 40w.

Are you using the most appropriate length laser lens for engraving your specific material type?
80 Watt 700mm x 500mm Ke Hui KH-7050 Laser (Similar to the Red Sail),T.R.
LaSea/EFR F2 Series laser tube, RuiDa RDC6442G EC controller, 2" lens, RDWorks v8.01.18, CW 5000 chiller, Chuck type of rotary attachment
Doug

Alexis Tzoulis
Posts: 89
Joined: Thu Oct 06, 2016 5:03 pm
Location: Greece

Re: Downgrade laser tube

Postby Alexis Tzoulis » Thu Jan 05, 2017 11:02 pm

Iam using 1.5'' lens for 300dpi.
I saw a large machine with ruida controller especially designed for engraving stone and uses 40w chinese glass tube.
http://mirtels.com/catalog/laser-engrav ... g-machines
This is the reason iam asking for downgrading my tube.
KH-7050 60w (50w real) (700mmx500mm) redsail clone TR
Ruida 6442G controller - MYJG-60W power supply - 1000mm/50mm co2 tube
RDWorks V8.01.19 - corel draw x8 - windows 10
Alexis

John Lifer
Posts: 32
Joined: Mon Dec 05, 2016 5:02 am
Location: NorthWest Arkansas

Re: Downgrade laser tube

Postby John Lifer » Fri Jan 06, 2017 7:03 am

Better quality in what regard? Lower wattage isn't the key when you are at only 50 watts. I'm at 80 watts and with only a trial or two can do decent quality. Do you have photograv or similar software? That is the key if you are wanting photo engraving. And I would change DPI to 600 (0.04) on your settings.
Working with a Ray Fine Chinese CO2 Laser
RF-13900 1300x900 bed, 80 Watt
Using TR and RDworks V8.01.19
John in NWA

sebastien laforet
Posts: 100
Joined: Wed Sep 07, 2016 1:23 am
Location: Lyon, France

Re: Downgrade laser tube

Postby sebastien laforet » Fri Jan 06, 2017 7:56 am

+1 with john. i have a 100W tube and i have successfully engraved on 0.2 or 0.3mm cardboard without getting through. i have to say that for paper cutting, this is an issue because too much speed cause sloppy curves, but this does not happen when engraving since the arm just moves along X-axis on each pass. then you can use high speed (>200mm/s) without accuracy issue, hence no burning trough.

also, engraving granite requires some power, and i really doubt that 50W would be "too much", i have tested this myself and it requires all the power you can put onto, or you will have to reduce speed, which is not required for accuracy.
Sébastien Laforet
machine : Bodor BCL-0605 (60x50) with 100W laser with TR origin.
Live in France
Primarily works laser for my wife (school teacher, so lots of boxes, letters, puzzles, ...) and miniature scenery (32mm scale : warmachine, infinity)

Scott Marquez
Posts: 9
Joined: Sat Jul 23, 2016 7:58 am
Location: Washington State

Re: Downgrade laser tube

Postby Scott Marquez » Fri Jan 06, 2017 7:29 pm

I would suggest looking at your focused output dot size instead if a different tube.
Check mirror alignment then your focus lense.
Scott
Rabbit Laser RL-60-1290, Leetro MPC 6565 controller, Rotary attachment, Corel Draw x6, Bobcad Ver 27/28
Juki-LU 2810-7, Juki 1900 AHS, Juki LU-1508, Juki LH-3188-7, Juki LH 1182, Consew 328RB-1, Consew 227R
Sheffield 530 HC webbing cutter

Michael Dunning
Posts: 42
Joined: Sat Nov 26, 2016 11:02 pm
Location: Alabama USA

Re: Downgrade laser tube

Postby Michael Dunning » Sat Jan 07, 2017 1:45 am

John Lifer wrote:And I would change DPI to 600 (0.04) on your settings.


Do you mean change the "Interval(mm):" size to 0.04 in the Layer Parameter? What size is appropriate for a 1.5" and 2.0" lens, respectively?
EBay Chinese 60W (45W actual) laser cutter, 700x500mm, (TR)
RDWorks V8.01.18 and V8.00.27
Michael

Alexis Tzoulis
Posts: 89
Joined: Thu Oct 06, 2016 5:03 pm
Location: Greece

Re: Downgrade laser tube

Postby Alexis Tzoulis » Sat Jan 07, 2017 5:51 pm

I have changed my lens from 1.5" to 2" and i have a slight improvement.
For best granite absolute black without flakes max dpi is 300.
My main problem is that machine does not print 256 shades of grey in fact it prints only 3 shades white/mid/black .
So it is very difficult to print a photo on granite with only 3 shades..
KH-7050 60w (50w real) (700mmx500mm) redsail clone TR
Ruida 6442G controller - MYJG-60W power supply - 1000mm/50mm co2 tube
RDWorks V8.01.19 - corel draw x8 - windows 10
Alexis

User avatar
fred ungewitter
Posts: 223
Joined: Tue Aug 16, 2016 12:55 pm
Location: East Central FL, USA

Re: Downgrade laser tube

Postby fred ungewitter » Sat Jan 07, 2017 6:20 pm

If you've run into the problem of limited gradient capability, consider an experiment using half-tone graphics. They are "two color" images, in that it's as dark as possible and as light as possible, but the size of the individual dots are varied to give the eye the equivalent gradient. Even today's newspapers continue to use half-toning for black and white images. Many graphics programs also provide for this feature. I did a quick check of the manual and no reference is found to half-tone. A quick search with The Google for "inkscape halftone" resulted in 27000 returns indicating that one could create an image using that software (or many others) and implement it with the laser. With 300 dpi resolution, the level of detail should be quite good. My old high school print shop aimed for 65 dpi on an offset press, probably pretty coarse by today's computer standards.
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: 141
Joined: Sat Nov 19, 2016 4:55 pm
Location: Phoenix, AZ USA

Re: Downgrade laser tube

Postby Dustin Hawkinson » Sat Jan 07, 2017 9:32 pm

Alexis, what is limiting you to only three shades? Is the material not capable of producing any other shades, or is it something with your machine or software?
40W (ebay 50W blue wonder), 300mm x 500m, TL
Windows10 RDW 8.01.19
(The member formerly known as astral)
-Dustin


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