Page 2 of 2

Re: Downgrade laser tube

Posted: Wed Jan 11, 2017 2:16 am
by Alexis Tzoulis
I see that glass tubes have a region of operation when the beam is not properly formed that called
"high frequency impact engraving" and in that region laser operates at high frequency so gives better engraving results.
For some reci models is about 4-5ma ...
How to find that region for my tube ? I have no datasheet.

Re: Downgrade laser tube

Posted: Wed Jan 11, 2017 5:19 am
by Gene Uselman
Russ said it was trial and error- different for each tube/machine. I 'think' he was using the sound to identify it- I have poor hearing so I cannot say. Gene

Re: Downgrade laser tube

Posted: Wed Jan 11, 2017 6:05 am
by Alexis Tzoulis
In which video Russ explain that with sound ?
Today installed an ammeter and tried 15% (5ma) 250mm/s but the results are bad only 3 shades of grey in granite.

Re: Downgrade laser tube

Posted: Wed Jan 11, 2017 6:08 am
by Doug Fisher
Download the index of Russ' videos which is available on this forum in the section about Russ' videos. I bet you will be able to find the episode you are seeking.

Re: Downgrade laser tube

Posted: Wed Jan 11, 2017 12:41 pm
by Michael Dunning
As I recall it is a combination of the sound and the fact that as you watch the laser tube the beam will "dance" around the end of the tube, as opposed to being a solid, well-defined laser beam. I still need to try it out on my machine though.

Re: Downgrade laser tube

Posted: Wed Jan 11, 2017 12:50 pm
by Gene Uselman
Alexis- watch # 56,57,58. I believe those are the ones that talk about it. Gene

Re: Downgrade laser tube

Posted: Thu Jan 12, 2017 3:35 pm
by Alexis Tzoulis
It is video #63
I know this machine with ruida 320 controller has 40w tube https://www.youtube.com/watch?v=RnYldY6yUKw
but which 40 tube & power supply produces the quality result shown in granite portraits?

Re: Downgrade laser tube

Posted: Thu Jan 12, 2017 7:29 pm
by Alexis Tzoulis
This power supply (HY-T50 50w) https://www.aliexpress.com/item/Co2-Las ... 84795.html
matches co2 tube length:800mm dia:50mm like this http://www.ebay.de/itm/10-64-m-Wellenla ... 2137074728 ?

Re: Downgrade laser tube

Posted: Thu Feb 02, 2017 7:03 am
by Alexis Tzoulis
I have installed HY-T50 50w power supply to KH-7050 1000mm (50 real watts) tube
but iam getting the same engraving quality with 60w factory power supply.
With 50w power supply iam getting more linear response with different power levels...
At 50% the ammeter show 10mA, with factory power supply at 30% showed 10mA.