Homebrew PCBs

At 1,000 DPI, the laser isn't going to be anywhere near it's supposed to be
anyway.  Close enough thought.

The beam of the laser will be probably bigger than a dot a 1,000 DPI (which
is good as the overlap fills in the gaps) depending on a bunch of things.

Dunno how LinuxCNC does rastering, but often the laser is left on between
dots so that evens things out.  Sometimes you want dot - dot - dot lasering,
but not in this case.

Tony


> -----Original Message-----
> From: Homebrew_PCBs@yahoogroups.com
> [mailto:Homebrew_PCBs@yahoogroups.com]
> Sent: Saturday, 13 December 2014 4:27 PM
> To: Homebrew_PCBs@yahoogroups.com
> Subject: RE: [Homebrew_PCBs] Re: laser ablation of paint on copper clad
> 
> At certain locations in the rotation angle, the laser does not fall
directly in the
> center of the pixels.  How are the pixels in the bitmap mapped to their
position
> in the arc?  Is the Bresenham algorithm or a similar
> algorithm used?
> 
> -----Original Message-----
> From: Homebrew_PCBs@yahoogroups.com
> [mailto:Homebrew_PCBs@yahoogroups.com]
> Sent: Thursday, December 11, 2014 2:30 AM
> To: Homebrew_PCBs@yahoogroups.com
> Subject: Re: [Homebrew_PCBs] Re: laser ablation of paint on copper clad
> 
> Hello..
> It's written in video description. The data is provided by python script.
> Well the workflow is like that:
> 
> -Draw board.
> -export board to 800 or 1000DPI BW image -pass that image to python script
to
> get bitfile -load bitfile into LinuxCNC -Push start
> 
> Slavko.
> 
> p.s.
> It's possible to pass just BW image to Linuxcnc but the power of my
computer is
> just little to low to provide data in realtime. So I do preproces data.
> Maybe just better algorithm can solve that...
> 
> 
> On 11. 12. 2014 00:43, 'Boman33' boman33@... [Homebrew_PCBs]
> wrote:
> > Very nicely done!!
> >
> > What software are you using to do the bitmap or vector to rotary
> > control/firing?
> > Bertho
> >
> > -----Original Message-----
> > From: Homebrew_PCBs@yahoogroups.com
> > [mailto:Homebrew_PCBs@yahoogroups.com]
> > Sent: Wednesday, December 10, 2014 09:06
> > To: Homebrew_PCBs@yahoogroups.com
> > Subject: Re: [Homebrew_PCBs] Re: laser ablation of paint on copper
> > clad
> >
> > Just make a crapy video to show how I do that.
> > Instead to use CNC XY table and get 1200mm/min I add A rotational axis
> > and got 30159mm/min scan rate and use only Y axis to advance board
> > every revolution of arm by 0.01mm.
> >
> > The laser is mounted in aluminum arm to the stepper motor. Powering
> > stepper motor with 16 or 32x microstep was total disaster. Now I drive
> > motor in full step but picked speed where inertia of arm just coencide
> > with resonance so motion is wery smoth.
> >
> >
> > http://youtu.be/8ekioGZOkb4
> >
> >
> >
> >
> >
> > ------------------------------------
> > Posted by: "Boman33" <Boman33@...>
> > ------------------------------------
> >
> > Be sure to visit the group home and check for new Links, Files, and
> Photos:
> > http://groups.yahoo.com/group/Homebrew_PCBs
> > ------------------------------------
> >
> > Yahoo Groups Links
> >
> >
> >
> >
> 
> 
> 
> ------------------------------------
> 
> ------------------------------------
> 
> Be sure to visit the group home and check for new Links, Files, and
Photos:
> http://groups.yahoo.com/group/Homebrew_PCBs
> ------------------------------------
> 
> Yahoo Groups Links
> 
> 
> 
> 
> 
> 
> ------------------------------------
> Posted by: "Jeff Heiss" <jeff.heiss@...>
> ------------------------------------
> 
> Be sure to visit the group home and check for new Links, Files, and
Photos:
> http://groups.yahoo.com/group/Homebrew_PCBs
> ------------------------------------
> 
> Yahoo Groups Links
> 
> 
>