Author Topic: SiXYLaser  (Read 68228 times)

Agastar

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Re: SiXYLaser
« Reply #165 on: January 09, 2017, 04:01:28 PM »
WooHoo! I'm glad you were able to get it working. I see you went with the belts crossing over in the middle by flipping the belts over so they are flat when they cross each other. Man, that looks really sweet!

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Re: SiXYLaser
« Reply #166 on: January 09, 2017, 04:31:15 PM »
Looks like the low power laser machine DIY community will be getting a new frame design...!!!

Are you going to offer a DIY kit? or just plans or ???
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Pawpawpaw85

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Re: SiXYLaser
« Reply #167 on: January 09, 2017, 10:01:40 PM »
Are you going to offer a DIY kit? or just plans or ???

I dont know, have to lookup on rules here in Sweden if I'm allowed to sell. Have thought of using Shapeways to sell it so that people without a printer, or people that dont want to spend the time printing all the parts, can order the 3D printed parts.

All the files will be free to download and print yourself if one wishes to thought; As all my other parts, I dont mind not earning anything from them, I enjoy seeing others finding what I've created useful :)

WooHoo! I'm glad you were able to get it working. I see you went with the belts crossing over in the middle by flipping the belts over so they are flat when they cross each other. Man, that looks really sweet!

It seems to have no downside so far crossing the belts like that, but it makes one able to tense the belt really tight without introducing torquevectors that's not easy to deal with, so win/win so far at least :)

Agastar

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Re: SiXYLaser
« Reply #168 on: January 09, 2017, 10:52:49 PM »
Good deal, I'm glad you got it working. I know how frustrating it can be sometimes.

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Re: SiXYLaser
« Reply #169 on: January 10, 2017, 12:54:35 PM »
Nice work!
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Pawpawpaw85

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Re: SiXYLaser
« Reply #170 on: January 14, 2017, 08:03:32 AM »
I'm getting some "defects" with the engravings using the laser, small curved things does not appear to be of correct geometry.

I thought it was due to the fact that the whole laser had vibrations (from stepper motors running) but that vibration is very tiny and cant be the cause of the issue.

Then I thought it may be due to the steppers not having microstepping, but then I saw some post that Eleksmaker boards have it enabled by default so may not be the issue either.
How do one know if microstepping is enabled or not, can it be checked easilly?

I can clearly hear when the engraving large circules that there are discreet steps the motors run as the frequency of the noise does not change smoothly but in quite large steps.

Then I thought perhaps it may be that I run Inkscape and the J Tech export plugin. Since the text is tiny I cant zoom in enough to see what the plugin is actually doing to the geometry, but what's another good application to try and export vector file to gcode for our boards that dont make geometric changes to the code?

Have any of you been having this issue as well?

It's quite difficult to notice and if I wouldnt be aware of how the letters are supposed to look like then I would not have noticed either.
I'm just trying to get the SiXYLaser running as good as I can before sharing the files, trying to see if it's a mechanical, electrical or software error is not very easy when it's only at very tiny scales one can see the error.
« Last Edit: January 14, 2017, 08:06:29 AM by Pawpawpaw85 »

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Re: SiXYLaser
« Reply #171 on: January 14, 2017, 08:08:23 AM »
What version of Grbl are you using?

Can you post your Grbl settings so we can see them? Sounds like you might need to tweak one of these settings.
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ggallant571

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Re: SiXYLaser
« Reply #172 on: January 14, 2017, 09:09:07 AM »
Are you doing ARCs in the grbl firmware or is the host application converting to line segments? There is a non-zero (probably multiple mill-seconds) processing time for each arc segment and if that exceeds your motion time it will make the stepper motors jerky. Beikeland as his mm/hz ratio. If I recall correctly you are also using a unique X/Y motion algorithm that is not widely used.

BTW - I think your design is great and would be willing to be your first end user.
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Pawpawpaw85

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Re: SiXYLaser
« Reply #173 on: January 14, 2017, 11:38:04 AM »
I think mechanically the machine feels solid, if I grip the laser carriage and try to move it by hand a tiny bit I cant feel any clearance or hear any sound like one can if it's too much clearance somewhere, all bearings have screws to adjust tension on them to eliminate the clearance, so I dont think that's the issue either.

Perhaps a jerk value or what it's called is maybe too high so the whole machine is moving as it changes direction, I dont know right now and unfortunately dont have time to check today, possibly tomorrow.

I dont know if it uses arches, how can one verify if it does and if it does so too quickly?

I have noticed that the machine does not quite return back to the same starting point compared to beginning of a circle, it's approximately ~0.15mm off (A whole lot better than what I got with the bought machine, but I'd still like it to be ~0.05 or less to be satisfied.

I hope to get some more information and see if it is something mechanically that's easy to fix, if it is then I can do the changes and verify them and then upload the SiXYLaser project in its current stage for others to try too, it's quite difficult to share information and get feedback to others that dont use the same machine, but I'm greatful for all input, I'm for sure not a software guys and It's very possible I've done something wrong while configuring GRBL for CoreXY motion, and since no one seem to be using it really for this application I havnt been able to find values to start with, so I had to guess based on values I use on my 3D printer.

If you guys build the SiXYLaser then please do keep in mind that it may change and upgrades might have to be printed on it to get it working as good as possible, it's very difficult to find these types of errors when working on a project all alone :)

I have uploaded a closeup of the testcut that I made with this last itteration of the SiXYLaser and uploaded it to the link below so you guys can see how it perform and possibly know what might be the cause of it.
For size reference, small letters are 3.5mm high and large ones are 8mm.

http://i.imgur.com/WS6kSVn.jpg

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Re: SiXYLaser
« Reply #174 on: January 14, 2017, 12:07:47 PM »
Still would like to see your Grbl settings. ..
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ggallant571

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Re: SiXYLaser
« Reply #175 on: January 14, 2017, 12:12:51 PM »
Save and examine the generated gcode would be the most definitive method to determine the arc method. If you can post your original file I will etch on my gig.
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Pawpawpaw85

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Re: SiXYLaser
« Reply #176 on: January 14, 2017, 01:18:41 PM »
I'll try making a new testfile tomorrow, brain is too tired to start CAD :)

Ralph, I will get those settings posted tomorrow, my laser laptop is currently occupied being hooked up to DJ gear :)
Do you mean the settings one get when typing $$ for GRBL?

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Re: SiXYLaser
« Reply #177 on: January 14, 2017, 01:28:15 PM »
>Do you mean the settings one get when typing $$ for GRBL?

Yes.
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Pawpawpaw85

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Re: SiXYLaser
« Reply #178 on: January 15, 2017, 05:35:23 AM »
Here are the current GRBL settings I use:

$1=255 (step idle delay, msec)
$2=0 (step port invert mask:00000000)
$3=3 (dir port invert mask:00000011)
$4=0 (step enable invert, bool)
$5=0 (limit pins invert, bool)
$6=0 (probe pin invert, bool)
$10=3 (status report mask:00000011)
$11=0.010 (junction deviation, mm)
$12=0.002 (arc tolerance, mm)
$13=0 (report inches, bool)
$20=0 (soft limits, bool)
$21=0 (hard limits, bool)
$22=0 (homing cycle, bool)
$23=0 (homing dir invert mask:00000000)
$24=25.000 (homing feed, mm/min)
$25=500.000 (homing seek, mm/min)
$26=250 (homing debounce, msec)
$27=1.000 (homing pull-off, mm)
$100=80.000 (x, step/mm)
$101=80.000 (y, step/mm)
$102=10.000 (z, step/mm)
$110=3000.000 (x max rate, mm/min)
$111=3000.000 (y max rate, mm/min)
$112=10.000 (z max rate, mm/min)
$120=500.000 (x accel, mm/sec^2)
$121=500.000 (y accel, mm/sec^2)
$122=10.000 (z accel, mm/sec^2)
$130=200.000 (x max travel, mm)
$131=200.000 (y max travel, mm)
$132=10.000 (z max travel, mm)


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Re: SiXYLaser
« Reply #179 on: January 15, 2017, 08:50:09 AM »

I'm flagging the following items for closer inspection/comments by others:

$1=255 you have
$1=10 I have

$3=3 you have
$3=1 I have

$11=0.010 you have
$11=0.020 I have

$12=0.010 you have
$12=0.020 I have
Admin -- Ralph -- support @ BenCutLaser dot us
https://www.dropbox.com/s/qv1qee2vb65785t/SetupBenCutLaser3.2a.zip?dl=0
BCL Paid license: $49.95
via Paypal to bclpp@primemail.com