Biting off more than I can chew.

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Picengravertoo
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Re: Biting off more than I can chew.

Postby Picengravertoo » Wed Jul 19, 2017 2:22 am

Picengravertoo wrote: GRBL PWM will generate the exact same gcode as Analog/PWM will if the settings are the same. The reason I suggested using the Analog/PWM profile because it has more features then GRBL PWM has including the Feed Rate Change. The FRC will add a varible feedrate to each line of gcode to slow in higher laser power darker shade areas and it speeds up the lower laser power lighter shade areas.


You may need to engrave at the Right-45D angle because the 4W focused laser beam may not be quite round.

Every laser burns different, so you will just have to do a trial & error test again with the 4W. Since the EmBlaser's uses the CoreXY belt configuration, the set feedrate relative to the run feedrate is not accurate anyway. Try bumping the feedrate up to 3000mm/min and the Pixel Resolution to .1778.

Geoffrey Benton
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Re: Biting off more than I can chew.

Postby Geoffrey Benton » Wed Jul 19, 2017 3:09 am

Ta mate, I'll give that a go.

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Re: Biting off more than I can chew.

Postby Geoffrey Benton » Wed Jul 19, 2017 8:17 pm

Still pretty dark. I need to understand how you arrived at the figures of 3000 and .1778. What is the maximum speed feed rate and what is the maximum pixel number? I tried again with the thing set at analog but it just doesn't work. Are there any other settings I can change to get a bit more lightness, or less darkness?
Thanks for your patience.

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Re: Biting off more than I can chew.

Postby Picengravertoo » Wed Jul 19, 2017 9:03 pm

Geoffrey Benton wrote:I need to understand how you arrived at the figures of 3000 and .1778.


I don't have a 4W EmBlaser, so I guessed. Try a higher feedrate if it's too dark.

Geoffrey Benton wrote:What is the maximum speed feed rate and what is the maximum pixel number?


I never tested what the maximum feedrate is with the EmBlaser, but the grbl $110= $111= settings will limit it if set too low. However, there is a limit how fast GRBL can actually run the short incremental raster moves also. If the Pixel Resolution is set to high, there will be gaps between the laser's burn lines. If it's set to low, they will overlap.

Geoffrey Benton wrote:I tried again with the thing set at analog but it just doesn't work. Are there any other settings I can change to get a bit more lightness, or less darkness?


Unless you are selecting a feature in Analog/PWM that GRBL PWM does not have like the Feed Rate Change, Extended Edge, Right 45D, Horizontal 2X or Vertical 2X engraving angle, it generate the exact same gcode. Or, you have not set the common settings the same in Analog/PWM as you did in GRBL PWM. Switch back and forth between the two profiles and compare.

Geoffrey Benton
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Re: Biting off more than I can chew.

Postby Geoffrey Benton » Thu Jul 20, 2017 5:48 am

Thank you. The settings I chose for the last run
Dog Engraved settings 4.jpg
Dog Engraved settings 4.jpg (178.94 KiB) Viewed 8038 times

started off wonderfully. I chose 3mm Bunnings ply with the smooth side up and a nice little grain change. As you can see, it was attempt four and the stuff I learned along the way was fantastic. It is a big image. I don't know why but I always set high goals and am determined to see my way through. It looks like it was going to take about six hours to complete but that' s OK, I have a spare six hours. It started off perfectly, you can almost count the hairs on the dog' s back but about half way through disaster struck and I don' t know why, or how to overcome it.

Any suggestions would be gratefully received.
With this one, I plan to cut the dog out and glue it onto a decorative background. I have a piece of worm eaten timber that will be perfect.

I was gunna send you the code but it is 108 MB and when I tried to load it into word, it shit itself and died.

Thanks for your patience.
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IMG_6678 (Small).JPG
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Re: Biting off more than I can chew.

Postby Picengravertoo » Thu Jul 20, 2017 8:27 am

That's a shame.

I would recheck the set (grub) screws in the stepper pulleys to make sure there tight. Darkly Labs recommends applying grease on the linear bearing rods, but the seals on the bearings just wipes it off. I applied the grease that came with the EB inside of the linear bearings so the seals keeps it inside circulating through the ball bearings. I then wiped any excess grease off the rods so it don't collect any dust. I only had to grease them one time. Check your belt tension again also.

I'm not at my EmBlaser right now, but I will post my grbl settings for you to compare to yours later today.

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Re: Biting off more than I can chew.

Postby Geoffrey Benton » Thu Jul 20, 2017 8:49 am

Thanks mate. It' s not the end of the world but I would like to finish this journey. I shall follow your suggestions on the morrow and try again.

Cheers GB

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Re: Biting off more than I can chew.

Postby Picengravertoo » Thu Jul 20, 2017 9:50 am

$0=30 (step pulse, usec)
$1=255 (step idle delay, msec)
$2=0 (step port invert mask:00000000)
$3=2 (dir port invert mask:00000010)
$4=0 (step enable invert, bool)
$5=0 (limit pins invert, bool)
$6=0 (probe pin invert, bool)
$10=2 (status report mask:00000010)
$11=0.005 (junction deviation, mm)
$12=0.002 (arc tolerance, mm)
$13=1 (report inches, bool) <--------Set for Imperial units. $13=0 is for Metric units.
$14=1 (auto start, bool)
$20=0 (soft limits, bool)
$21=0 (hard limits, bool)
$22=1 (homing cycle, bool)
$23=0 (homing dir invert mask:00000000)
$24=25.000 (homing feed, mm/min)
$25=2000.000 (homing seek, mm/min)
$26=250 (homing debounce, msec)
$27=1.000 (homing pull-off, mm)
$100=200.000 (x, step/mm)
$101=200.000 (y, step/mm)
$102=200.000 (z, step/mm)
$110=5000.000 (x max rate, mm/min) <------------Limits the max X feedrate.
$111=5000.000 (y max rate, mm/min) <------------Limits the max Y feedrate.
$112=5000.000 (z max rate, mm/min)
$120=10000.000 (x accel, mm/sec^2)
$121=10000.000 (y accel, mm/sec^2)
$122=2000.000 (z accel, mm/sec^2)
$130=400.000 (x max travel, mm) <----------A3 X max travel.
$131=280.000 (y max travel, mm) <----------A3 Y max travel.
$132=10.000 (z max travel, mm)

Geoffrey Benton
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Re: Biting off more than I can chew.

Postby Geoffrey Benton » Fri Jul 21, 2017 2:17 am

I'm not sure what that picture is trying to tell me. Should I check my code to see if those things are correct, or are they suggestions, or do they tell me max settings? I gave up on the six hour project and decided to have a go at a smaller one which I am pleased to say was successful.

IMG_6684 cropped (Small).jpg
IMG_6684 cropped (Small).jpg (109.84 KiB) Viewed 8021 times


I do want to impress upon your goodselves just how appreciative I am for the continuous help I have been getting.

I have built a pdf tutorial outlining all of the steps taken to get from this picture to the finished job above and you will find the link below, embedded with the kindly assistance of Mr Picengravertoo.
IMG_0035 (Small).JPG
IMG_0035 (Small).JPG (57.3 KiB) Viewed 8021 times


https://www.picengrave.com/This-to-this.pdf

Cheers.

GB
Last edited by Geoffrey Benton on Fri Jul 21, 2017 9:39 pm, edited 1 time in total.

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Re: Biting off more than I can chew.

Postby Picengravertoo » Fri Jul 21, 2017 3:18 pm

Excellent results. :respect)

Thanks for sharing.


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