Hobby, 3D, Relief, CNC  

[ Új üzenetek · Tagok · Fórumszabályzat · Keresés · RSS ]
Oldal 39 / 51«1237383940415051»
A fórum moderátora: Amatőr, KisKZ, tweakie 
Fórum » Only in English » Technologies » Diode Lasers. (Using Diode Lasers with CNC Machines.)
Diode Lasers.
JJWMACHINECO Dátum/Date: Vasárnap, 2013-05-26, 00:53 | Üzenet/Post # 761
komoly tag
Csoport/Group: Felhasználók
Üzenetek/Posts: 443
Kitüntetések/Medals: 5
Hírnév/Fame: 2
Helyzet/Status: Offline
Jereme,

No one Is pissed off. John's PDF explains in detail how my ratios are setup on my machine, but you have to understand, I work in inches, not metric, so there may be a lack on my part to be able to explain the ratios to you better then I have.

My mistake, I went back and looked at my manual and it says to set the steps to 640 for metric on Z and for inches I had to set it for 16256 steps.

Maybe Paul can explain the ratios better how to get the 256 incremental steps you need then I can as he works in metric values.


Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver
 
Dave Dátum/Date: Vasárnap, 2013-05-26, 01:11 | Üzenet/Post # 762
aktív tag
Csoport/Group: Felhasználók
Üzenetek/Posts: 192
Kitüntetések/Medals: 1
Hírnév/Fame: 0
Helyzet/Status: Offline
OK Jeff, I'll try to explain......
First, consider a grayscale image, where each pixel is represented by a one byte value between 00 (black) and hexadecimal FF (white). There are 256 possible values for each byte, and that equates to the number of steps for the motor to take. You want those 256 steps to move the encoder shaft 1 full turn.
On my setup, I have a hobbycnc motor control board driving 1.8 degree steppers. It is capable of microstepping at 1/2, 1/4, 1/8, or 1/16 step, and mine is set to 1/2 step microstepping, so I need mach3 to move 400 steps for one complete motor shaft revolution.
The motor/encoder pulley ratio is 3 to 1, so 1/3 of a motor revolution moves the encoder all the way around so its output varies between 0 volts and 5 volts. With a voltmeter on the encoder, I single step jog down from 0 volts until the meter reads 5 volts, and record the 'depth' from mach3's DRO. That becomes the max depth I use on the picengrave menu.
---
Easier with the counter/DAC circuit or Jeff's digital potentiometer circuit - I set the steps per inch in mach3 to 10,000 or 0.0001 inch per step for the axis that feeds the circuit. A full count of 256 (hex FF) becomes a 'depth' of 0.0256 inches on the mach3 DRO and in picengrave's menu. Now I think I've burned out my last brain cell.  biggrin
Dave
 
fefenin Dátum/Date: Csütörtök, 2013-05-30, 15:15 | Üzenet/Post # 763
kezdő tag
Csoport/Group: Felhasználók
Üzenetek/Posts: 34
Kitüntetések/Medals: 0
Hírnév/Fame: 0
Helyzet/Status: Offline
thank you all !!

Idézet
K Jeff, I'll try to explain......
First, consider a grayscale image, where each pixel is represented by a
one byte value between 00 (black) and hexadecimal FF (white). There are
256 possible values for each byte, and that equates to the number of
steps for the motor to take. You want those 256 steps to move the
encoder shaft 1 full turn.
On my setup, I have a hobbycnc motor control board driving 1.8 degree steppers. It is capable of
microstepping at 1/2, 1/4, 1/8, or 1/16 step, and mine is set to 1/2
step microstepping, so I need mach3 to move 400 steps for one complete
motor shaft revolution.
The motor/encoder pulley ratio is 3 to 1, so 1/3 of a motor revolution moves the encoder all the way around so its
output varies between 0 volts and 5 volts. With a voltmeter on the
encoder, I single step jog down from 0 volts until the meter reads 5
volts, and record the 'depth' from mach3's DRO. That becomes the max
depth I use on the picengrave menu.
---
Easier with the counter/DAC circuit or Jeff's digital potentiometer circuit - I set the
steps per inch in mach3 to 10,000 or 0.0001 inch per step for the axis
that feeds the circuit. A full count of 256 (hex FF) becomes a 'depth'
of 0.0256 inches on the mach3 DRO and in picengrave's menu. Now I think
I've burned out my last brain cell. 
Dave

this is very well explained, i didn't know the stepper board could really and truly output 1/16 of a step.

i hope you still have few brain cells left!!

that's all ... so i need to find a better stepper driver chip or make the DAC circuit.

thank you again everyone ! smile

jeremy

Hozzáadva (2013-05-30, 15:15)
---------------------------------------------
ok so i fingured out how to control the sensor properly, thanks to an old board that i had laying around (tb6560 based and modified to make it work properly)

and thaks to you all!

here is the video:



know i think i will still make the DAC cause i'll be using this board to control my next 3d printer project...
still waiting for the driver from denmark but i think there is still few days to wait cause "badpip2010" as still some exams.

Az üzenetet módosította/Modified by fefenin - Vasárnap, 2013-05-26, 09:47
 
csewe Dátum/Date: Péntek, 2013-05-31, 15:43 | Üzenet/Post # 764
Fontos tag
Csoport/Group: Moderátorok
Üzenetek/Posts: 596
Kitüntetések/Medals: 3
Hírnév/Fame: 1
Helyzet/Status: Offline
Hi guys.

Unfortunately ruined by 3W 808nm laser.
Now I can not experiment with for a while.
But it to monitor the laser topic.

Best regards.
Zoli.
 
tweakie Dátum/Date: Péntek, 2013-05-31, 17:28 | Üzenet/Post # 765
alapvető tag
Csoport/Group: Adminisztrátorok
Üzenetek/Posts: 972
Kitüntetések/Medals: 6
Hírnév/Fame: 5
Helyzet/Status: Offline
Idézet
Unfortunately ruined by 3W 808nm laser.


Sorry to hear that Zoli - if it's any consolation, you are not the first and I am sure will not be the last to do that.

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.
 
picengraver Dátum/Date: Péntek, 2013-05-31, 17:40 | Üzenet/Post # 766
Fontos tag
Csoport/Group: Felhasználók
Üzenetek/Posts: 528
Kitüntetések/Medals: 3
Hírnév/Fame: 2
Helyzet/Status: Offline
Zoli,
Tweakie is right, but I know that it doesn't make it any easier to accept.   Who said our hobbies were inexpensive? dollar shock

I still waiting for my replacement diode - hopefully today the mailman will find my address. yes

John


I paint with a blue light beam.
 
fefenin Dátum/Date: Péntek, 2013-05-31, 20:22 | Üzenet/Post # 767
kezdő tag
Csoport/Group: Felhasználók
Üzenetek/Posts: 34
Kitüntetések/Medals: 0
Hírnév/Fame: 0
Helyzet/Status: Offline
sorry to hear that as well!!

did you do something special to burn it?
 
JJWMACHINECO Dátum/Date: Péntek, 2013-05-31, 21:55 | Üzenet/Post # 768
komoly tag
Csoport/Group: Felhasználók
Üzenetek/Posts: 443
Kitüntetések/Medals: 5
Hírnév/Fame: 2
Helyzet/Status: Offline
Sorry to here that Zoli.

Is there a 445nm in the near future?  wink

Jeff


Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver
 
csewe Dátum/Date: Szombat, 2013-06-01, 05:04 | Üzenet/Post # 769
Fontos tag
Csoport/Group: Moderátorok
Üzenetek/Posts: 596
Kitüntetések/Medals: 3
Hírnév/Fame: 1
Helyzet/Status: Offline
Thanks for the sympathy guys.

jeremy.
Unsure TTL level was the cause.
Vibration was established.
The laser diode can not handle a few KHz vibration.
Go to pot.

Jeff.
Yes
I want to buy 2-3W 445nm laser diode.
But we need at least two months.

Zoli.
 
Muk Dátum/Date: Péntek, 2013-06-07, 12:35 | Üzenet/Post # 770
ismerkedő tag
Csoport/Group: Felhasználók
Üzenetek/Posts: 61
Kitüntetések/Medals: 0
Hírnév/Fame: 0
Helyzet/Status: Offline
Just a question for all you diode junkies, what sorts of costs are you looking at for a diode head? Say if I were to install a diode to the head of my cutter for specifically wood shading with grey scale....

Fan, heatsink, diode + lens/housing, power supply for it, PWM/POT setup. Is that about it?
 
JJWMACHINECO Dátum/Date: Péntek, 2013-06-07, 12:55 | Üzenet/Post # 771
komoly tag
Csoport/Group: Felhasználók
Üzenetek/Posts: 443
Kitüntetések/Medals: 5
Hírnév/Fame: 2
Helyzet/Status: Offline
Rob,

Ask Dave. He may sell you his turnkey one at a reasonable price. Considering it may help him recover some of his cost with his new CO2 toy.  shock

Jeff


Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver
 
Dave Dátum/Date: Szombat, 2013-06-08, 00:24 | Üzenet/Post # 772
aktív tag
Csoport/Group: Felhasználók
Üzenetek/Posts: 192
Kitüntetések/Medals: 1
Hírnév/Fame: 0
Helyzet/Status: Offline
I think I'll hold on to the diode laser for a while, Jeff.
Dave
 
Muk Dátum/Date: Szombat, 2013-06-08, 01:32 | Üzenet/Post # 773
ismerkedő tag
Csoport/Group: Felhasználók
Üzenetek/Posts: 61
Kitüntetések/Medals: 0
Hírnév/Fame: 0
Helyzet/Status: Offline
So what sort of Diode setup do you run Jeff? I'm just trying to get a bead on how much it would cost to consider that sort of 'expansion' for myself. I see diodes varying in power and price and wavelengths from $40-$170 for just a diode.
 
JJWMACHINECO Dátum/Date: Szombat, 2013-06-08, 01:49 | Üzenet/Post # 774
komoly tag
Csoport/Group: Felhasználók
Üzenetek/Posts: 443
Kitüntetések/Medals: 5
Hírnév/Fame: 2
Helyzet/Status: Offline
Idézet (picengraver)
OK guys, Laser Setup PDF is here:  http://www.picengrave.com/Laser%20Setups.pdf

John


Rob,

here is a PDF of some laser diode component info that John had posted earlier in this thread.

Jeff


Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver
 
Muk Dátum/Date: Szombat, 2013-06-08, 01:50 | Üzenet/Post # 775
ismerkedő tag
Csoport/Group: Felhasználók
Üzenetek/Posts: 61
Kitüntetések/Medals: 0
Hírnév/Fame: 0
Helyzet/Status: Offline
Much thanks =)

Edit: Read through it all, WOW. That is awesome...thank you so much for that. Beautiful stuff...


Az üzenetet módosította/Modified by Muk - Szombat, 2013-06-08, 01:55
 
JJWMACHINECO Dátum/Date: Szombat, 2013-06-08, 02:03 | Üzenet/Post # 776
komoly tag
Csoport/Group: Felhasználók
Üzenetek/Posts: 443
Kitüntetések/Medals: 5
Hírnév/Fame: 2
Helyzet/Status: Offline
Here is the laser diode I would recommend.

http://www.ebay.com/itm....15900d7

It has ESD protection and will land in the 2-2.5W range with the 3 element glass lens. My current engraving system is only 1W that is in the pdf and the one I used for the engravings I posted in this thread.

Jeff


Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver
 
Dave Dátum/Date: Szombat, 2013-06-08, 03:07 | Üzenet/Post # 777
aktív tag
Csoport/Group: Felhasználók
Üzenetek/Posts: 192
Kitüntetések/Medals: 1
Hírnév/Fame: 0
Helyzet/Status: Offline
That diode looks like a good choice to me, much better output than the 1.7 watts that mine has. I think the 445nm lasers here http://visiblediodelasers.com/ look like the one that Jeff and I started with. I don't see his stuff on ebay, but I've always had trouble searching for stuff there.
Dave
 
JJWMACHINECO Dátum/Date: Szombat, 2013-06-08, 11:29 | Üzenet/Post # 778
komoly tag
Csoport/Group: Felhasználók
Üzenetek/Posts: 443
Kitüntetések/Medals: 5
Hírnév/Fame: 2
Helyzet/Status: Offline
Here is what he offers on ebay now.

http://www.ebay.com/itm....3ef98e9

It's pricey. Both me and Dave gutted ours and installed in different enclosures. I'm sure he will agree, what we know now, we would have just build our own from scratch allot cheaper. The hardest thing to find right now is an appropriate 0-5V analog modulated driver for these laser diodes. Both me and Dave have the Flexmod P3 which has been out of stock for quite some time now. 

http://hacylon.case.edu/ebay/laser_diode/FlexModP3.php

Jeff


Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver
 
JJWMACHINECO Dátum/Date: Vasárnap, 2013-06-09, 12:36 | Üzenet/Post # 779
komoly tag
Csoport/Group: Felhasználók
Üzenetek/Posts: 443
Kitüntetések/Medals: 5
Hírnév/Fame: 2
Helyzet/Status: Offline
For anyone that would like to build there own 0-5V analog modulated laser diode driver, here is a schematic of a circuit I found on the web. The LM317 can be changed to a LM338 for up to 5A output.

More information can be found here.

http://www.repairfaq.org/sam/laserdps.htm#dpsldd317

Jeff

Csatolások/Attachments: 1797281.gif(82Kb)


Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver

Az üzenetet módosította/Modified by JJWMACHINECO - Hétfő, 2013-06-10, 00:38
 
fefenin Dátum/Date: Hétfő, 2013-06-10, 11:48 | Üzenet/Post # 780
kezdő tag
Csoport/Group: Felhasználók
Üzenetek/Posts: 34
Kitüntetések/Medals: 0
Hírnév/Fame: 0
Helyzet/Status: Offline
hi,

thank's for the schematic Jeff.

i just finished my DAC today... as you can see it is a bit of a mess, but everything is on the board ( relay voltage regulator LEDs ...)

i just used Dave's schematics added leds et a relay as recommanded in the datasheet. and because i only had a max492 as an op i had to use a lm317set to 6v to have the full span (0 to 5 V) with 8 bits... (seams like the max492 is not really rail to rail)

now i'm kind of desparate to recieve my laser driver from Badip2010 but still no news from him (i sent 4 mails). i guess i'll have to be more patient...or build the board Jeff pointed out.

here is the video of the DAC in action with steps at 2.5 hz and counting down . (from 5v to  6mv)



regards
jeremy


Az üzenetet módosította/Modified by fefenin - Hétfő, 2013-06-10, 11:51
 
Fórum » Only in English » Technologies » Diode Lasers. (Using Diode Lasers with CNC Machines.)
Oldal 39 / 51«1237383940415051»
Keresés:

Copyright HobbyCnCArt © 2016