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### Author Topic: The Laser Project.  (Read 1546376 times)

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#### TOTALLYRC

• 861
##### Re: The Laser Project.
« Reply #940 on: April 13, 2016, 06:35:00 AM »
Way cool guys,
If I only had a laser and the time to work with it. Maybe when the other 40 projects are done.

Mike
We never have the time or money to do it right the first time, but we somehow manage to do it twice and then spend the money to get it right.

#### Tweakie.CNC

• 9,231
• Super Kitty
##### Re: The Laser Project.
« Reply #941 on: April 13, 2016, 06:40:57 AM »
Way cool guys,
If I only had a laser and the time to work with it. Maybe when the other 40 projects are done.

Mike

Mike, how can you possibly live without a laser ?

Tweakie.
PEACE

#### ART

• 1,702
• Tough as soggy paper.
##### Re: The Laser Project.
« Reply #942 on: April 13, 2016, 07:12:00 AM »
Tweakie:

>>Are you using a variable PWM (linked to axis speed) to provide the Acceleration

The PWM is controlled on a 1ms waypoint basis. So each time I sent waypoint data, I also
send a PWM for that ms. The program looks into a database for each location to get its power
point for that ms ( an image in this case), and then scales that power by a formula based on
feedrate and euclidian distance of the upcoming ms's motion. So for example, if an F8000 is in effect,
and 50% laser power is selected, the program calc's the energy per mm going out, and maxes at 50% when we
hit 8000/ 60000 = .13mm's per ms. So all power is then scaled from 0 - .13mm/sec with .13 being
50% power output, this is recalcuated each ms.
All that fixes very well accel and decel and keeps power very smooth here for the most part,
but I intend now to add a quadratic correction formula to the power curve to smooth it more
to take into account nonlinearity of a particular laser.
I know Ill never make it perfect, but Im of the feeling the more calibrations you have, the better
it "should" get. Its not a bad initial testing for only a 10 watt engraver.. Thats 2mm deep, Im
aiming for 19.  , doing multipass should let me get results more similar to a 100 watt..just slower.

Art

#### ART

• 1,702
• Tough as soggy paper.
##### Re: The Laser Project.
« Reply #943 on: April 13, 2016, 07:13:46 AM »
>>The 8000 mm/min is particularly impressive, that's galvo performanc

, actually, I slowed it down for 3d, my photos are now done at up to 25000 mm/min.

Art

#### ART

• 1,702
• Tough as soggy paper.
##### Re: The Laser Project.
« Reply #944 on: April 13, 2016, 07:14:39 AM »
>>Mike, how can you possibly live without a laser ?   Grin

How can anyone? lol

Art

#### Tweakie.CNC

• 9,231
• Super Kitty
##### Re: The Laser Project.
« Reply #945 on: April 13, 2016, 11:04:23 AM »
Wow !

Great stuff Art, keep up the good work my friend.

Once I have finished-up on the paid work (it must run out soon) I will be back with the laser experimentation.

Tweakie.
PEACE

#### ART

• 1,702
• Tough as soggy paper.
##### Re: The Laser Project.
« Reply #946 on: April 13, 2016, 02:02:29 PM »
Heres one at 12,000.

Art

#### TOTALLYRC

• 861
##### Re: The Laser Project.
« Reply #947 on: April 13, 2016, 08:03:41 PM »
Way cool guys,
If I only had a laser and the time to work with it. Maybe when the other 40 projects are done.

Mike

Mike, how can you possibly live without a laser ?

Tweakie.

Barely getting by but somehow I manage.
We never have the time or money to do it right the first time, but we somehow manage to do it twice and then spend the money to get it right.

#### ART

• 1,702
• Tough as soggy paper.
##### Re: The Laser Project.
« Reply #948 on: April 17, 2016, 04:21:19 PM »
I leave you with a final test image in teak,

40mm x 40mm , 475inches/min

Art

#### Dan13

• 1,208
##### Re: The Laser Project.
« Reply #949 on: April 18, 2016, 01:05:15 AM »
It's fantastic, Art! But how is it that the wood maintains its natural colour and doesn't look burned?

Dan