08 – RF Laser Source Tests: Lets Understand What We Have

The Tangerine Tiger Series with Russ Sadler

In this Series, Russ has purchased a new 500 x 300mm, 50W laser machine from eBay with a view to modifying and upgrading it. In fact, he rips out the glass laser tube and high voltage power supply and replaces them with an RF laser source and PSU from Cloudray. Russ decides to carry out some RF laser source tests and compares the results to a glass CO2 laser tube.

If you are considering purchasing a CO2 laser machine with an RF laser source from one of the big boy suppliers, I would suggest you check out this series before making a decision!

Contents

Having more or less completed the build (there are a few small detail issues still to be resolved) and beam alignment completed, we know that the machine works and is usable to carry out initial tests. These tests include analysing the beam profile, recording the RF laser power characteristic and using an oscilloscope to verify how the PWM signal controls the laser beam power.

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RF Laser Source Upgrade - Mode Burn Test
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Transcript for RF Laser Source Tests: Lets Understand What We Have

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0:01now welcome to another session with my tangerine tiger please excuse the slightly echoey sound

0:07but i’m outside in my garden room at the moment it is um raining outside and uh yeah it’s not a

0:14very nice day but hey it’s a great day for doing what we’re going to have to do which is some theory and theorizing now we found out

0:22last time that we got what looks like the essence of a very nice machine but i need to understand this machine

0:27before i start playing with it and using it and so today is all about trying to

0:32decode how the machine works now i’m not going to go into the actual way in which the

0:40laser works because i haven’t fully decoded that yet but i’m getting there and sooner or

0:46later we will drill down and have a look at how the actual laser system itself works it isn’t

0:52terribly different to a gas tube laser but the way in which it’s controlled is different

0:59i haven’t got an SPT laser but good old SPT i love them dearly they really are a

1:05great company because they tell you a great deal about their product

1:10they’re not shy about giving you the truth and they have a version of it called the zamiya 30 watt which as

1:17you can see is exactly the same as the unit that i’ve got so i’m using their specification sheet i

1:24mean i spent a little bit of time looking at this sheet to try and understand what’s going on it says pump

1:30method rf excited i know what that means and i will explain that to you at a later date

1:35the rf frequency which is the thing that creates the ionized nitrogen as something called 100

1:41megahertz so we’ve got a frequency built into this unit which has

1:46nothing to do with the control frequency that’s a high frequency a radio frequency which is purely to get the

1:54ionized nitrogen in the tube version you would see that as the pink glow that’s the ionized

2:00nitrogen well that’s that would normally be generated by a high dc

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

2:06voltage as we know in the glass tubes well here it’s generated by high frequency as

2:13opposed to high voltage wavelength power average power

2:19interesting that word average we’ll come back to that later because i don’t fully understand that

2:24that basically to me means that the average output power of this unit is 30 watts

2:29which as we found out last time i thought i had a 30 watt unit but it seems to be delivering about 38 watts

2:37you can’t make up watts you could lose watts easily with a power meter but you can’t make them up so what we saw was real

2:45now it claims here that the output range is not to 30 watts

2:50how do we control that there’s only one input and that’s this pwm input here

2:58somewhere inside this pwm we are controlling the power and also the frequency

3:06of the machine because this machine works not only with radio frequency which is

3:13just a means of producing the laser action most of the time it’s working with a pulsing duty cycle

3:20not a continuous duty cycle so let’s try and understand

3:25what these terms here mean we’ve got rise and fall time duty cycle

3:32and modulation so those are the three terms that i’m going to be concentrating on today because i think

3:38i don’t know but i think they are the key features that are going to control this unit

3:44now eventually later on i’m going to be putting my oscilloscope onto the pwm terminal

3:51and trying to find out exactly what is going on so not only are we going to be trying to

3:56look at the electronics which are these features here

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

4:02because the electronics don’t actually tell you what’s going to be happening down on the

4:07surface of your material so there’s a relationship that we need to establish between the electronics and

4:14the real world first of all we have something called a pwm now we’ve we’ve set the pwm in the

4:20vendor settings to 25 kilohertz now from my previous work with the glass tube and the reader

4:26controller i know what the pwm signal looks like it’s basically a square wave

4:34okay now a square wave looks like this it starts high it goes low and then it

4:40goes back high again and then it’s joined onto another one and another one

4:46so we finish up with this square wave shape now this square wave here represents one

4:53cycle and we are talking about 25 000

4:59cycles a second and that’s what 25 kilohertz is so just to put some more detail on that

5:06so in one second if we divide one second by 25 000

5:12we finish up with zero zero zero four four zeros and a four now let’s

5:19just make some sense of that point zero zero zero comma zero zero zero

5:28so that’s a millisecond or a thousandth of a second and that’s a microsecond which is a

5:34millionth of a second okay and we have got one two three four three we’ve got four so here we are

5:4340. one two three four four naughts and a four so we’re talking

5:49about 40 micro seconds

5:55for a cycle so that’s as fast as the machine can actually pulse

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

6:02the problem that i had was when i sat down and looked at that and then i looked at another part

6:09of the specification which says pulse rise stroke fall time now to me

6:17that implies that when i’ve got a square wave

6:22i’ve got a square wave that does this

6:33where that time there the rise time and there the fall time

6:43is 100 micro 100 microseconds but hang on if that’s 100 microseconds

6:50and that’s 100 microseconds that means the pulse is going to be 200 microseconds long

6:57but i’ve only got a pulse that’s 40 microseconds long at 25 kilohertz so now i’m scratching my

7:04head and thinking do they mean microseconds or do they mean nanoseconds

7:09sometimes these values do get a bit scrambled up when it comes to

7:15specification sheets because the people that write the spec sheets don’t actually understand what they’re talking about

7:20so there’s conundrum number one we’re getting a mismatch of data

7:27let’s just assume that we put that problem aside for a minute and we just carry on

7:33and try and work out how do we control the power forget the actual frequency at the moment let’s just stay with

7:38the square wave it clearly says on here pwm duty cycle 0 to 100 what does that mean

7:47[Applause] well what that means is that whatever that height is

7:53of the square of the square wave means i’m going to get an output of 30 watts from the unit am i going to get 30 watts

8:00as i mentioned last time look we’ve got 50 percent of the time we’ve got 30 watts and the other 50

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

8:08of the time we’ve got zero watts so therefore the average of that is going to be 15

8:16watts now how do i get 30 watts out of this unit i think that this here

8:23[Music] will be expressed as 50 power [Music]

8:29on our controller because 50 percent of the time we’re getting

8:35power and 50 of the time we’re not getting power this is a slightly different way of

8:41using this term percent power in the previous glass tube situation

8:46the power represented current flow now it doesn’t represent current flow it

8:52represents the amount of time that the beam is on it’s on for 50

9:00of the time here and off for 50 of the time so if we want 30 watts out of this unit

9:07what we’ve got to do is we’ve got to ask the power to come on and stay on

9:14for 100 of the time and then go off and come back on again and go off and come back on again i mean

9:21it’s never going to go off technically i’m just drawing it like this to illustrate the point so here we’ve now got a pulse width

9:28modulation of 100 and that’s what we’re seeing here duty

9:35cycle 100 the cycle is 100 on and

9:400 off now equally well when we look at the average power that’s

9:46coming out of here it’s no longer 15 watts half the time it’s 100

9:5230 watts all the time so this is like 30 watts

9:57cw continuous wave so this is very much the same as a glass tube where we’ve got

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

10:04continuous output we’ve got no pulsing and that is how i think i did my testing

10:10because i set the power to a hundred percent so that’s why i’m seeing 30 watts okay now

10:19if i want to change my power in the same way that i’ve gone from 30 to 15 by using 50 percent

10:27and instead of going 50 percent we go say 10 percent on and all that time

10:35off 10 on off 10 on off so now

10:42we’ve got 10 percent of 30 watts so we’ve only got 3 watts now

10:53so here we are with 10 and we’ve got 10 of

11:0330 watts so we shall only have effectively an output of an average

11:10output of 3 watts so now hopefully you can begin to see how that by changing this

11:17ratio of the square wave how much it’s on and how much it’s off we can change the

11:23power output of the unit and that’s what this duty cycle is here not to 100

11:32we can change the pwm duty cycle and allow more power or less power we’ve got this big

11:38question mark here with the rise and fall time we now understand what the duty cycle

11:45means it’s a means by which we can control the power that outputs from the tube

11:52what about this other thing here modulation we set the vendor setting parameter to 25 000 cycles a second

11:59because we have chosen the rf tube within the vendor settings so when you

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

12:05look at the power controls now and press advanced you’ll see that in there you have got for each layer

12:11the opportunity to specify a different frequency

12:17so we can modulate as they call it the

12:22frequency between 0 and 25 kilohertz

12:28so what effect does that have here’s our standard 25 kilohertz that we’ve

12:34discussed already and we showed that if we reduced the power

12:39percent to 10 percent what we’ve done we’ve reduced the amount of time

12:46that element there as 10 percent of the cycle and in 10 of the cycle we’re going to

12:53finish up with three watts as opposed to a full cycle of 100 30 watts

13:02now when we halve the frequency to say 12.5 kilohertz

13:08we’ve got two of these cycles now we’ve reduced it to one cycle in the same

13:14period of time now when you look at this picture here you’ll see that

13:1910 of that longer cycle represents a much longer period of time

13:27so you might think to yourself yeah that means i’m going to get 6 watts

13:33of output it gets a little bit more complicated than that because that isn’t true

13:40we’ve still got 10 of this longer period of time so as well as this on period here being

13:48longer this off period here is much longer as well so the ratio

13:55is still ten percent so on average we should still get 3

14:01watts not 6 watts

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

14:08out of this pulse but however you look at it we’ve had that pulse on for longer than

14:14this pulse therefore we must be doing twice as much damage we’re doing twice as much damage but

14:21we’re taking longer to do that damage because the pulses are spaced further apart who said this was easy i

14:28have to point this out to you because we’ve got these two forms of control so we’ve got the mark space ratio

14:34control which as i said is our percent power

14:44and then we’ve also got this modulation control which has a different effect it slows

14:51down the pulses but it actually increases the amount of time

14:56that the pulse is on for in other words we’re likely to do more damage because we’re holding the

15:02pulse on longer now although the average power coming out of this

15:08is still at three watts we have still got

15:1630 watts available in every pulse

15:23and that’s the big difference between an rf pulsing system and a constant

15:30power system let me try and explain that in very simple terms that you can probably

15:38understand you’ve seen me before doing the candle test

15:44where i put my hand over a candle flame and i move it slowly across the flame it doesn’t hurt

15:52if i move it very very slowly it certainly does hurt all right the point that really is

15:59taking place there is we have got a fixed amount of energy coming from the candle flame

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

16:07we can share that energy across the surface of my hand depending on how

16:13fast i move my hand over the flame i could stop my hand and use all the

16:19flat all the energy into one spot [Music] or i can move my hand faster and i can

16:25share the energy out okay so i can make and this is the best

16:32way of imagining this the feel on your hand the faster you go the less it hurts

16:40well that wouldn’t be the case here because we’ve got 30 watts for every single

16:47pulse we’re not sharing the power out we might be sharing the distance out in

16:55other words this is a 30 watt pulse here and a 30 watt pulse here and a 30 watt pulse here

17:01i shall finish up burning 30 watt pulses across my hand

17:06right whereas with a constant system i will just generate a very thin

17:12line of energy across my hand so that’s the big difference between a

17:18constant on system and a pulsing system you won’t find this stuff explained anywhere else

17:25if you go to one of the big boys websites they don’t tell you how their machine

17:30works all they will do will give you menus which will allow you to select these numbers

17:36and you have no idea what they’re actually doing unless you have an understanding of the basic principles of

17:42what pwm is what duty cycle is and what and what the modulation of

17:48the signal is going to create so yes we’re still going to finish up

17:54with average 3 watts with this system but you’re going to finish up with the same powerful pulses that you are producing

18:02here as well 30 watts now with the glass tube laser

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

18:09there was a sort of emulation of this principle available to you in something

18:15called special mode and there the duty cycle wasn’t called duty cycle

18:22it was called this strange term for cooler so immediately you turn you turn special

18:29mode on you would get this 50 on 50 off you were no longer operating with continuous

18:36current but you could get back to continuous current by changing the cooler to

18:41100 okay and that just allowed this duty

18:46cycle to get longer and longer and longer so when we start using the machine we shall

18:54have to come back and look at this to try and understand what we’re doing when we’re damaging materials

19:01because i hope you can begin to see that changing the frequency has a different effect to

19:07changing the duty cycle so at the moment this is just speculation on my part

19:12based on the knowledge that i have so far i’m projecting what i will find and how this system works i don’t

19:20actually know but it will become completely clear when we start looking at the signals with the oscilloscope

19:28so we should easily be able to verify what’s going on here at a single pulse when we look at it on the oscilloscope

19:34i’m now going to show you how i think i’m going to be able to find out the relationship

19:40between what these signals are doing and what happens on our material here’s a surface and

19:47here’s my laser beam coming in like this remember what the curtains effect

19:52caused if we slow the beam down we burn deeper

20:00if we speed the beam up slow it down speed it up

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

20:07slow it down speed it up because we slow it down we’ve got more time to

20:13do damage and so we burn deeper now that’s what happens with a constant power

20:20b that is changing its speed slow down faster slow down faster slow down

20:28we will generate that sort of pattern now that makes the laser machine a very good

20:34velocity plotter and so what i propose to do here

20:40is do something like we’re allowed to do because it clearly says here that we can

20:46change the modulation to zero well i don’t want to go to zero

20:51but what i might do is to go down to something like 500 hertz if i run the machine

21:01at a thousand millimeters a second with a 500 hertz

21:09signal and 50 percent power i.e we’re going to finish up with

21:1650 on 50 off what sort of pattern am i going to be

21:22generating on the surface because on will produce a pit an off

21:28will produce nothing so i should theoretically be able to generate

21:37this sort of pattern on the surface now what sort of size pattern am i going to be expecting when

21:43i put these numbers into reality well look a thousand millimeters a second

21:50so in a thousandth of a second i’m going to travel one millimeter so what does 500 hertz equal

21:58so if i take one second and i divide it by 500

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

22:05i get 0 0 2 that’s 2 milliseconds

22:15so that means at 500 hertz i’m going to travel two millimeter

22:22two millimeters per cycle

22:31so that’s going to be very easy because technically what i should see is one millimeter one millimeter

22:41and one millimeter now whether 30 watts is enough to create sufficient damage

22:48for me to see is interesting in acrylic i’m hoping

22:53that i should be able to see some noticeable pits in addition to those noticeable pits if they are

23:02sufficiently clear i hope i might be able to examine them under the microscope and see

23:08things like this it may well look something more like that with curves but it should tell us

23:16clearly approximately what this rise and fall time is

23:22now whereas in a glass tube there is a relationship between the current flow and

23:30the power output the watts output so we had current flow which was pretty linear

23:35like this okay so these are watts and these are milliamps the milliamps go

23:40up at a steady rate and the watts do not go up at the proportional rate now here we’ve got a completely

23:47different situation i believe because we have got constant current and we’re switching

23:55that constant current on and off to get the change of average power because we’re chopping it

24:02up as i said we’re using the what they call the duty cycle to control the power

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

24:08so now i believe that what i’m going to get i’ve got no idea what the current is

24:13because it’s going to be constant and say like that but because we’ve got constant current i

24:21think that what we’re going to finish up with now is a graph that looks like this

24:26[Applause] 50 equals 50 percent of the available 30

24:33watts 100 equals 100 of the available 30 watts so therefore i’m anticipating a direct linear

24:41relationship between percent power

24:48and what and finally i think one of the very very first

24:53things we’ll do when we get back onto the machine [Music] let’s do a mode burn it’s a very nice

25:00six or seven millimeter beam and i’m expecting to get a nice

25:08sharp mode burn into a piece of acrylic how deep that goes will be interesting

25:16for 10 seconds because you’ve seen that i can bore my way through almost 25 millimeters

25:23in 10 seconds with a 70 watt constant power laser how far do i get

25:29through with a 30 watt laser i wonder you’re getting a front seat view of a mode burn

25:40now at the moment i haven’t got the air assist on this machine hooked up so i’m gonna have to use my

25:46my blower to um make sure i keep the fumes away from the front here

25:51otherwise they’ll catch fire not one two

25:57three four five six seven eight

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

26:03nine ten that’s not too bad so we’re very quickly

26:09swap the times two for the times three um beam expander and look at the

26:15difference north one two three four five

26:23six seven eight nine ten

26:31to be honest if i had a tube that looked like that i would throw it away because that mode

26:38burn is so blunt it’s pretty useless for cutting and for

26:46engraving so i think you can see clearly the difference in the power distribution between those two beams they’re the same

26:54beam one has been expanded three times and one has been expanded twice no competition i’m sticking with

27:01the two times at the moment because that has much greater damage capability now the other thing

27:07that’s slightly more difficult to see but when you look around the outside of

27:13that beam you can see all the low energy density power how it melted and bubbled up

27:21the acrylic and not evaporated it we’ve got a lot of low energy in the outer area of the beam

27:29whereas when we look at this one that damage around the outside is very

27:37minimal we’re concentrating a lot of the energy down the center part of the beam and

27:43that’s what i like to see what i’ve got here are two mode burns i’ve got one that i’m going to put

27:49behind the ones i’ve just done this one at the top here

27:55is for my 70 watt cloud ray tube this one here is from our times 2 rf

28:01beam and this one here somewhere times three rfb the point i really want to

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

28:08make here is that for a long time i’ve heard some

28:14now i don’t want to call it but effectively that’s what it is from the

28:21big boys who have always had a serious down on these cheap chinese glass tube

28:27machines that don’t last any time at all and i’ve been to exhibitions and i’ve heard those sorts of words mentioned

28:34but you cannot deny the facts now that i’ve got my hands on another type

28:40of machine which they claim to be the best in the world well look a 30 watt tube is a 30 watt

28:48tube you can’t perform miracles with 30 watts if you want to cut you need power

28:56so don’t regard these 30 watt rf tubes as cutting machines i never have

29:04and now i never will do yes they will cut but they will only cut what you could

29:10cut with a k-40 you might be able to cut three millimeter material you might be able to

29:16cut six millimeter material very very slowly but hey we should get

29:21on to that later but the fact is you require power to cut this is

29:26an axe this is a scalpel you cannot chop a tree down with a scalpel

29:32we move on from that interesting fact i’ve just carried a calibration on this machine but

29:40what i’ve had to do is to block this off with temporarily with a piece of card

29:46because the airflow at this end i was at risk of calling the doohickey

29:53down with this high airflow so i’ve had to protect it from the airflow to get say

30:00more accurate figures the figures are not quite what i expect

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

30:05so i’ll just go and plot them out and we’ll take a look at the graph okay please excuse the typo we’ll fix that

30:12later but it’s not important because hey the thing that’s important is my prediction of what this tube would do is

30:20um 80 wrong this is what i thought it might do it

30:27might produce a linear output yeah this is sort of linear but it’s not

30:34good enough to really be called linear i mean let’s be fair it’s probably about 30

30:40adrift so something is not quite happening as i

30:45expected and described to you previously at the moment i think this is a 25

30:50kilohertz signal and it’s operating with proportionate

30:56control and proportionate control should be as i described you earlier

31:02linear the fact that it’s not hmm

31:07there’s only one way to find out what’s going on and that’s to have a look at the pwm signal there’s my little oscilloscope

31:14that feeds into my laptop

31:20and gives us the opportunity to see what’s happening to the pwm signal

31:25what we’ve got here are zero volts and somewhere just about here we’ve got five volts

31:33okay so now i’ve got the system currently set to 50 percent power

31:39in other words i’m expecting to see half the peaks high and half the peaks

31:45low so let’s just check

31:50we’ve run a program and we can clearly see here we’ve got 50 high and 50 low

31:58so that’s working a treat the only problem is we’ve got two cycles

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

32:03per division and the divisions across the bottom there say they are 0.1

32:11milliseconds if we’ve got not 0.1 milliseconds for an interval that means one cycle is

32:18taking 0.05 of a millisecond so if i take one second

32:25and divide it by point zero zero zero which is a millisecond zero

32:33that one five so four naught zero five the answer comes out

32:40at 20 000

32:45hertz in other words 20 kilohertz

32:52now i thought i’d got this system set to 25 000 so we’re going to have to now go back

32:57and look into the vendor settings and find out what is it that is set to 20 000

33:04right we’re going to vendor settings read so so there’s my problem check glass 2

33:1225 kilohertz 1 and 99 we could set that to 100.

33:25right so i’ve hopefully got this set up now with 40 microseconds for

33:32two divisions in other words 20 microseconds per division now if you remember when we did the

33:37calculations for 25 kilohertz it was 40 microseconds per complete cycle so

33:43here we should see one division up and one division down

33:50there’s our 50 50 50 pwm it goes to the same level every time

33:59that that looks like about four and four and a half volts so we now change to 10

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

34:06so now we should see just a little bit high and the rest of it low like that

34:14so this is exactly as i described it to you this is the duty cycle 10 on 90 off and that 10

34:22there represents the 10 that you’re selecting on the keyboard if we select 99 we should see a little

34:29division let’s just resample again 99

34:35and there it is at just over four and a half volts so there’s no change in the signal level

34:40going to the rf unit the pwm is purely changing the duty cycle

34:46to change the amount of power that we’re putting into the pulse and we’re either putting

34:54long pulses or short pulses but they’re all the same power so on this machine it

35:00looks as though we cannot change the power by changing the level of the signal we can only change the

35:08power by the ratio of the signal length i’m just going to draw

35:15a circle put the padlock on and i’ll make that circle 10 millimeters diameter

35:23now 10 millimeters diameter means it’s got just over 30 millimeters of circumference we’ll put this

35:30into a cut layer we’ll make the speed about two millimeters a second then it will be 15 seconds roughly to

35:36run around the surface let’s set the power to 50 percent because we know what 50 looks

35:42like on the screen 50 50. we’re going to this advanced mode now the only one that’s available

35:48to us is number one and it says laser frequency well

35:54we’ll put that tick and this time we’ll change that to we had it to 25

35:59kilohertz before which took up two increments on the screen let’s take it down to 12.5 as we did

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

36:07with our example 12.5 kilohertz and then we should realize that it will take up

36:12four increments on the screen so now if i’m seeing this right

36:17we should see full signal level five volts and too high and too low and there we go

36:25just as predicted too high too low so really we’ve only got

36:32two controls for this machine we’ve got our power control which as i

36:39mentioned to you before changes the mark space ratio this is 50 power so it’s 50 high 50

36:46percent low if we change it to 10 power we get 10 percent high 90 low but there is a second function

36:54which is the modulation which is the frequency and that allows us to change the length of the pulse

37:02combined with a slow repetition rate so we can either have a fast repetition

37:08of a pulse at 25 kilohertz or we can have a much longer pulse getting closer to

37:16continuous mode long or short pulses at 25 kilohertz or long or short pulses or anything in

37:21between we’ve got control of the frequency we’ve got troll of the pulse width and that’s it

37:26here we are at the end of this session i think hang on let’s just turn this noise off

37:32oh my goodness me my ears are actually buzzing i’m gonna have to do a lot more than just a little bit of a cardboard

37:38deflector so in a strange sort of way there’s a lot less to understand on this

37:44machine than there was on the glass tube machine perhaps i’m saying that in hindsight now that i know a lot more

37:51about the glass tube machine but it seems as though this is going to be simpler

37:56so that’s actually converted it to grayscale already as it’s brought it in so let’s have a look to see whether or

38:03not we have the option oh yes we do we’ve still got our frequency control

Transcript for RF Laser Source Tests: Lets Understand What We Have (Cont…)

38:09now we’ve got our output direct which is greyscale so i can experiment

38:16with grayscale engraving on this machine because i’ve got a lot more control hopefully

38:21at the pixel level so we’ve got lots and lots of options that we can play with

38:26here for images we do some cutting i’m told that this system produces

38:32fantastic polished edges on acrylic am i cynical i think i was born with in

38:38my dna we shall have to see and find out just how good it is

38:43at what other people claim for this type of machine now we’ve got a machine that we understand and it’s working almost

38:50i’ve still got a few things to tidy up on this machine before we start working in earnest but hey we’re nearly

38:57there we understand all the tools that we’ve got to play with now which is great

39:03so thank you very much for your time and your patience and i shall see you in the next session

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Last updated August 26, 2021

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