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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: Vasárnap, 2013-08-11, 13:43 | Üzenet/Post # 121
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Here is the picture I was doing. It did not skip any lines in Y but the waves are still there (quite a bit smaller). It also has dark and light areas.
I will re-align the mirrors again and see if any thing will change.

Jerry

Csatolások/Attachments: 2675037.jpg(91Kb)
 
picengraver Dátum/Date: Vasárnap, 2013-08-11, 14:18 | Üzenet/Post # 122
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Jerry,
For this last image, did you open and close the case cover/lid during the engraving run?  If so, try doing an engraving start to finish with the lid closed.

I still think you may have a mechanically induced beam shift, and maybe the machine flexes a little when the lid is opened/closed.  The beam deflection seems to be randomly induced, hence my question.
John


I paint with a blue light beam.
 
Honk Dátum/Date: Vasárnap, 2013-08-11, 15:19 | Üzenet/Post # 123
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Hi John
No I did not open the case but I did take a couple of videos through the glass.( http://youtu.be/jVSwug2LyK8 ) It sure is strange as it does the same thing a little deferent every time I make a change in anything but nothing will fix it.
Thanks
Jerry
 
Honk Dátum/Date: Kedd, 2013-08-13, 14:22 | Üzenet/Post # 124
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I might have found something to get my laser to work, at least a little better. I exchanged my stepper drivers on X and Z and the problem is about 99%
gone on X. It did do something I have not seen before. I observed this a few
times as it was cutting. It would stop for a fraction of a second shake a bit as
it starts back up but not loose a step. The picture has a small spot right in
the center of Y axis where X moved over and back than finished the picture just
inside the line. If it does not get worse I can use it like this but I am going
to keep trying to fix it.

Thanks for all your help

Jerry Honkanen

Csatolások/Attachments: 8154092.jpg(142Kb) · 0972391.jpg(21Kb)


Az üzenetet módosította/Modified by Honk - Kedd, 2013-08-13, 14:23
 
tweakie Dátum/Date: Kedd, 2013-08-13, 15:46 | Üzenet/Post # 125
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Certainly looks like an improvement Jerry. ok

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.
 
picengraver Dátum/Date: Kedd, 2013-08-13, 17:41 | Üzenet/Post # 126
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Jerry,
I agree with Tweakie, but you have not eliminated the problem yet.  The errors are still evident, albeit at a smaller degree.  I recommend you do not change anything else, and reinstall the drivers you just took out, and test again.  If the errors go back to the previous extreme, then it is likely that all four drivers are defective.  Did you buy them at the same time from the same source?  Can you try a different brand of driver?
John


I paint with a blue light beam.
 
Honk Dátum/Date: Csütörtök, 2013-08-15, 14:12 | Üzenet/Post # 127
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John
 I'll try that, but I want to try to increase the amp settings for the motors and see if that will do something. The manufacture recommends a higher amp setting for these motors and we lowered them earlier for another problem. The big problem is that it was about 3 hrs. into the job before it goofed up.
And I'm going to take the week off and goof off for a bet.
Thanks
Jerry

Hozzáadva (2013-08-15, 14:12)
---------------------------------------------
John
I reset all the settings on the dip switches for the stepper drivers to what the factory suggests for these stepper motors. I also had to reset Mach3. I started running the same picture and it did real good but the motor was getting quite hot. (This was probably why we lowered them before) So I stopped. It went about 1/4 the way with out a mistake but I think I need to figure out how too keep it cooler. I am thinking I might need to change the gear ratio for the X and Y axis to lighten the load on the motors. I wrote the factory about this and am waiting for a response. As I was in the process of making this test cut I did some experimenting with speed and the pot. controlling the laser cutting power. This is going to be something else with problems past my comfort zone.  
Thanks again
Jerry

 
picengraver Dátum/Date: Csütörtök, 2013-08-15, 17:25 | Üzenet/Post # 128
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Jerry,
Stepper motors normally get HOT - usually too hot to hold your hand on them.  They are designed for it.  Set the drivers for the amps of the motors, and don't worry about their temperature.  Reducing the amps will reduce performance, and that may be something you can live with, but if you really want the high speed performance, then setting to design specs. is the better way to go.
John


I paint with a blue light beam.
 
picengraver Dátum/Date: Hétfő, 2013-08-19, 19:45 | Üzenet/Post # 129
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One of my favorite TV characters - Mr. Spock.

PEP4 +Laser V.4.2.1 - 60 ipm - .007" resolution.

John

Csatolások/Attachments: 1211509.jpg(65Kb)


I paint with a blue light beam.
 
Pabló Dátum/Date: Kedd, 2013-08-20, 16:26 | Üzenet/Post # 130
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picengraver,

respect
This was one method? Power control use?

Pabló


Pablo83.weebly.com

Az üzenetet módosította/Modified by Pabló - Kedd, 2013-08-20, 16:27
 
picengraver Dátum/Date: Szerda, 2013-08-21, 00:25 | Üzenet/Post # 131
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Hi Pablo,
Thank you.  The Spock image above was done with analog power control.  Max. was 1.8 amps diode current, and min. was .3 amps.

This Spock was done today with the same gcode file, but with a different wood of unknown type, and at 115 ipm feed rate.  The wood can really make a difference in engraving speed.

John

Csatolások/Attachments: 2373251.jpg(67Kb)


I paint with a blue light beam.
 
tweakie Dátum/Date: Szerda, 2013-08-21, 06:55 | Üzenet/Post # 132
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Nice work John. ok

It is interesting to see the comparison - although different they each have their own merits. Were they done with your new machine ?

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.
 
picengraver Dátum/Date: Szerda, 2013-08-21, 09:58 | Üzenet/Post # 133
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Thank you, Tweakie.  Yes on the new machine.  The mechanical frame and vertical layout is working out as well as I had hoped, but more laser power would make it better.  I think it might be possible to setup a dual diode like Jeff has done, but I'm not sure the cost could be justified.
John



I paint with a blue light beam.
 
Honk Dátum/Date: Hétfő, 2013-08-26, 02:57 | Üzenet/Post # 134
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Thanks to all you that helped!!!
I finely got it to run in a straight line. Stepper motors can run hot, my X axes ran at 65 deg C most of this job and that is hard to hold on to. Knowing this, ( thanks John )I set my motors to factory specs and all the trouble I have had went away. I think I am going to try the computer I started with and see if there was a problem with it. Know I will need to figure out how to get the gray shades right???
Thanks again
Jerry

Csatolások/Attachments: 6730811.jpg(221Kb)
 
picengraver Dátum/Date: Hétfő, 2013-08-26, 15:18 | Üzenet/Post # 135
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Jerry,
That's certainly an improvement.  Glad to see it.

It may just be the posted picture, but it seems like you may still be experiencing some horizontal shift.  This seems to be more evident in the lettering and the window frames.  Maybe a different image will show this not so.

I'm not sure you will be able to get gray shading with a CO2 laser like we can with laser diodes due to the power being so much greater.  Dave and Tweakie can better advise on this.
John


I paint with a blue light beam.
 
Honk Dátum/Date: Kedd, 2013-08-27, 03:26 | Üzenet/Post # 136
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John
It's done!!! I'm going to frame this one. 6 Hrs. at 50 ipm. Baltic Burch. The edges are all inside the line but Why did the letters do this?

Thanks again
Jerry



Csatolások/Attachments: 2874022.jpg(183Kb) · 0049062.jpg(42Kb) · 2037812.jpg(100Kb)


Az üzenetet módosította/Modified by Honk - Kedd, 2013-08-27, 03:31
 
tweakie Dátum/Date: Kedd, 2013-08-27, 06:21 | Üzenet/Post # 137
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Idézet
The edges are all inside the line but Why did the letters do this?


Hi Jerry,

It looks to me like your laser is not turning off quick enough (The image outside vertical edges only line up because that is the full extent of the X axis travel whilst the work is being created).

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.
 
Honk Dátum/Date: Kedd, 2013-08-27, 13:54 | Üzenet/Post # 138
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Hi Tweakie
I am having trouble understanding what you mean. Can you explain please? Is there something that I can do to fix this? 

(The image outside vertical edges only line up because that is the full extent of the X axis travel whilst the work is being created).
 
Thanks Jerry
 
tweakie Dátum/Date: Kedd, 2013-08-27, 15:20 | Üzenet/Post # 139
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Hi Jerry,

Obviously this is just a guess on my part that your laser is not switching off quick enough, but, I think that if your X axis travelled further than just the boundary of the image during each scan line then the smearing would also be visible on the outside vertical edges.

In your close-up picture of the word 'Mill', it is evident that this does not happen all the time and this baffles me a bit but it does happen on alternate scans so it is a bi-directional problem.

It would perhaps be good if you could use a simple image (with a small file size) for testing purposes then your GCode could be tried by others just to prove that you are not somehow getting a corrupt file.

Tweakie.

.


Success consists of going from failure to failure without loss of enthusiasm.
 
picengraver Dátum/Date: Kedd, 2013-08-27, 15:24 | Üzenet/Post # 140
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Jerry,
If you are using PEP to generate the gcode - what version?  If still 133, please switch to the latest release - 4.2.1.
Regards,
John


I paint with a blue light beam.

Az üzenetet módosította/Modified by picengraver - Kedd, 2013-08-27, 15:24
 
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