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PicDither - PicEngrave - PicLaser.
tweakie Dátum/Date: Vasárnap, 2013-06-23, 06:44 | Üzenet/Post # 1
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Anything relating to - PicDither - PicEngrave - PicLaser etc.
 
Honk Dátum/Date: Kedd, 2014-01-28, 16:19 | Üzenet/Post # 401
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Jeff or John
I went to order this: http://www.usdigital.com/products/encoders/absolute/rotary/shaft/ma3 and it has 3 things that need to be selected. This is some information that I will have to guess at. Or I could order all 9 and try them out to see which one is the best. Is there any suggestions to which on will be the best to fill my needs?
Thanks Jerry
 
Csatolások/Attachments: 9453000.jpg(41Kb)
 
JJWMACHINECO Dátum/Date: Kedd, 2014-01-28, 16:25 | Üzenet/Post # 402
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Jerry,

10-Bit Analog, 1/8" shaft and Ball Bearing is what you need. Also get the correct shielded cable for it too.

This one.

http://www.usdigital.com/product....3-SH-NC

Use the 5v from the USB port to power it, or the 5v from the PC power supply you built. We had only one of these fail on us only because my son accidentally put 12v to it. 

Jeff


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

Az üzenetet módosította/Modified by JJWMACHINECO - Kedd, 2014-01-28, 16:33
 
Honk Dátum/Date: Hétfő, 2014-02-03, 04:26 | Üzenet/Post # 403
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In Mach 3 there are two settings I am not sure how to set for my CO2 laser. In settings there are two boxes to select (CV Distance and CV Feed-rate) My program ran slow no mater how fast the federate was set and I could not make it go faster in override. It was doing a good job but I had no control on the speed of the feed rate. I unselected them in settings and it was working okay I could speed up and slow down but I don't know how they should be set and what they are for? I have only seen it as a problem twice but this time it was a very large file and I wanted to run it a little faster. Could it be something I am overlooking in setting up PEP4 423
Thank you Jerry
.
Csatolások/Attachments: 5986343.jpg(125Kb)


Az üzenetet módosította/Modified by Honk - Hétfő, 2014-02-03, 04:29
 
picengraver Dátum/Date: Hétfő, 2014-02-03, 22:27 | Üzenet/Post # 404
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Jerry,
I leave them unchecked myself.  Perhaps Tweakie can explain their use; I really don't know.

Using TTL will be slow.  It is the dithered images and the way gcode works that is causing the slowness, not PEP or Mach3.  Changes to CV will not make much difference, if any.

You might get some improvement by playing with the velocity and acceleration settings in Mach.  This will depend largely on how fast your machine steppers can respond.

John

Hozzáadva (2014-02-03, 18:38)
---------------------------------------------
Jerry,
Are you running TTL with CV on?  There needs to be a G64 at the start of your gcode file if you are.

You are showing it unchecked in the PEP image.  Try a file with it selected, or manually add G64 to your file.
John

Hozzáadva (2014-02-03, 22:27)
---------------------------------------------
Jerry,
I think this Mach post will help in understanding CV.
John
http://www.machsupport.com/forum/index.php/topic,7923.0.html


I paint with a blue light beam.
 
Honk Dátum/Date: Szerda, 2014-02-05, 18:44 | Üzenet/Post # 405
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Preview of my latest CO2 PEP4

Still needs paint and frame. Made a mistake in programing, I should have done the sky white and told it to skip the white. It was on the laser from 8:30 AM until 2:45 AM the next morning and most of the time was spent just going back and forth no color. I'm still having a little trouble figuring out CV and G64 but maybe someday???? 30 X 34 Inches. Bigger than the last one.
Thanks for looking
Jerry
Csatolások/Attachments: 6716958.jpg(194Kb)


Az üzenetet módosította/Modified by Honk - Szerda, 2014-02-05, 18:46
 
picengraver Dátum/Date: Csütörtök, 2014-02-06, 12:29 | Üzenet/Post # 406
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Jerry,
Looking at your latest work, an old expression comes to mind:
"Good things come to those who wait"

You work proves it.  Well done.
John


I paint with a blue light beam.
 
tweakie Dátum/Date: Csütörtök, 2014-02-06, 12:51 | Üzenet/Post # 407
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Indeed. Excellent work Jerry.

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.
 
JJWMACHINECO Dátum/Date: Csütörtök, 2014-02-06, 15:05 | Üzenet/Post # 408
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Jerry,

Maybe until you get your laser diode up and running, try using variable feedrate in PEP 4 with your CO2. That code will run faster in Mach3 then a dithered image using TTL will. I don't know if it will work with a CO2, but it's worth a try to speed things up.

Jeff


Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver
 
Honk Dátum/Date: Hétfő, 2014-02-10, 04:58 | Üzenet/Post # 409
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Jeff
I almost have the encoder ready to play with. I put a switch on my Z axis to have it run a separate stepper motor with 3.33:1 ratio to the US Digital encoder and  it works like a jewel. I need to set Mach3 and PEP4. Do you have a poop sheet worked up on the settings? It will save me some messing around time if you do.
Thanks Jerry
 
JJWMACHINECO Dátum/Date: Hétfő, 2014-02-10, 14:38 | Üzenet/Post # 410
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Jerry,

I think John has the same single diode you have. He may be able to help you with the settings.

Jeff


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

Az üzenetet módosította/Modified by JJWMACHINECO - Kedd, 2014-02-11, 03:16
 
picengraver Dátum/Date: Kedd, 2014-02-11, 01:35 | Üzenet/Post # 411
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Jerry,
You will be limited with a single diode to about 80 ipm maximum, depending upon the wood you use.  Start there and experiment with small images on scrap until you can fine tune the settings.  I recommend you also use feed rate change in the gcode at about 30% to 40%.
John


I paint with a blue light beam.
 
Honk Dátum/Date: Kedd, 2014-02-11, 02:36 | Üzenet/Post # 412
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John
I ordered the brake out board and a splitter for the DAC. I am almost sure That will do what I need to make this work. That statement sounds almost like an echo. I have in the encoder and running. It works real good but I'm sure I do not. I have it set at 70 IPM and 30%. I am Trying strip the color band you sent me but it is very jerky and burns extra at the color change. It is sort of working. It is like When the Z move changes the voltage, X slows down and burns the dark spot at each color change. I think I Pushed every button on Mach3 and PEP4 Trying to get it to smooth out. With and with out G64. My tooth gear ratio 40:14, in the gear on the encoder is the 3:53-inch circumference. I set the engine tuning to 626.61449 Mach3 steps in and steps on the stepper to 6500 per Which will give 0.0000 at 0 volts and 5 volts at -3.3500 (one turn). If I had a clue what I'm doing Would not it be so hard!
Thanks
Jerry PS I do not -0.0255 Understand how this can rotate one turn on the encoder?

Csatolások/Attachments: 9732130.jpg(96Kb)


Az üzenetet módosította/Modified by Honk - Kedd, 2014-02-11, 03:52
 
picengraver Dátum/Date: Kedd, 2014-02-11, 03:30 | Üzenet/Post # 413
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Jerry,
It will be jerky and burn at color changes with that much Z action.  Something is not set up right, but I don't have an encoder so can't say what.
John


I paint with a blue light beam.

Az üzenetet módosította/Modified by picengraver - Kedd, 2014-02-11, 03:31
 
JJWMACHINECO Dátum/Date: Kedd, 2014-02-11, 05:10 | Üzenet/Post # 414
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John,

It has nothing to do with the encoder and you know that. The MA3 encoder only outputs 0-5v based on rotation. What is rotating it is the issue and how many steps it's set at in Mach.

Jerry,

all I can say to you is, good luck.

Jeff


Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver
 
picengraver Dátum/Date: Kedd, 2014-02-11, 06:07 | Üzenet/Post # 415
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Jeff,
Sorry, but what I was referring to was the 3.5 inch 'Z' axis travel requires too much time for Mach3 to move the axis at each pixel position.  This will create a lot of axis hesitation.  Didn't mean to infer it was an encoder issue.  Jerry has something set wrong in Steps Per, but I don't know what to tell him to change it to other than to copy what you have posted before.
John

Hozzáadva (2014-02-11, 06:07)
---------------------------------------------
Jerry,
Do you have the larger pulley on the stepper?
John


I paint with a blue light beam.
 
Honk Dátum/Date: Kedd, 2014-02-11, 17:40 | Üzenet/Post # 416
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I figured it out!
I was Calculating the motor steps with the circumference of the small timing gear (3.5 inches). The circumference is not something you can see it is -0.0255 and guess what it is working now. It just takes us a little longer mentally handicapped. Jeff, I read your help page a few times before the light came on.Thanks for the help.
Jerry


Az üzenetet módosította/Modified by Honk - Kedd, 2014-02-11, 17:46
 
picengraver Dátum/Date: Kedd, 2014-02-11, 17:45 | Üzenet/Post # 417
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biggrin
Join the crowd, Jerry, I'm glad for the company.
John


I paint with a blue light beam.
 
JJWMACHINECO Dátum/Date: Kedd, 2014-02-11, 18:45 | Üzenet/Post # 418
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Your welcome Jerry,

Not to confuse matters, but I just want to say too, the MA3 has 10bit resolution on the output with the 0-5 analog voltage. That's 1024 increments instead of the 8bit, 256 increment voltage changes with the DAC. The reason this is important, if you setup the steps for half power (0-2.5v), you still are implementing 512 incremental voltage changes to the laser driver's modulation input even with a 8bit -.0256 depth value in PEP. You may not see with the naked eye the smoother transitions in your engravings between the shades, but theoretically, they are there.

Jeff


Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver
 
Honk Dátum/Date: Szerda, 2014-02-12, 02:58 | Üzenet/Post # 419
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First try off of the encoder. I need some tuning up, you can see two times I changed the speed but it's to dark on one end and to light on the other. I'll keep trying
Jerry
Csatolások/Attachments: 7082158.jpg(48Kb)
 
picengraver Dátum/Date: Szerda, 2014-02-12, 20:20 | Üzenet/Post # 420
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Jerry,
Looks like maybe too much power for the wood type.  Maybe try -.020 for max. depth and work up from there.
John


I paint with a blue light beam.

Az üzenetet módosította/Modified by picengraver - Szerda, 2014-02-12, 20:20
 
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