I did some tests on dry film that is exposed with blue laser. You can find the
result files under
http://tech.groups.yahoo.com/group/Homebrew_PCBs/files/BlueLaser_LDI_Volkan/
folder.
The minimum feature size that I achieved is 2.8/2.8  mil width and space. There
is no problem to print 1.4/1.4 mil width and space but development of the dry
film is a little bit problematic and it is not possible to do it with simple
tray technique. The film that I'm using has a thickness of 1.5 mil, according to
some google results the limit is 1.5*film thickness, so if it is true it seems
my results are almost at the limit.

Volkan

Volkan,
The results look great! Have a couple of quesitons. Is this from a raster scan
using a printer to scan. What sort of beam spot velocity do you think you have?
Would like to have a starting point for the vector draw speed.   Did you have to
scrub the dry film to remove the unexposed sections?
It looks like the edge definition is nice and sharp.

I haven't got my mill back running yes so I haven't had a chance to try the
vector write method yet.   I would be interested in what method you used to turn
on and off the laser.  I modified my current driver with a shunt fet to ground
to shunt off the laser current.  I don't know what sort of on/off speed I will
get yet,  would be interested in other ideas for a driver.   I finally found
some thermal printer paper and I did a couple of tests of my UV laser diode's
plastic lense last night and found the spot can be focused quite small.  I kept
burning through the paper if I kept the beam on too long.

Craig

I can second this -- the normal Brother toner doesn't seem to work.  I refilled
one of my old Brother cartridges with some toner I got off the net and that
worked ok for the toner transfer.  The refill instructions told you not to mix
the toner and to make srue the old cartridge with 100% empty.  I vacuumed out
the old cartridge before refilling but I screwed up and let the little white cap
seal on the bottle fall into the cartridge and now the cartridge clicks and
parts of the page have gaps.  I am comming up on another refill, so I will see
what happens with the new toner. Fuse temp is not one of the things they specify
on the aftermarket refills.

Craig

--- In Homebrew_PCBs@yahoogroups.com, DJ Delorie <dj@...> wrote:
>
>
> Warning: make sure it does NOT use the common "brother" toner which
> requires a much hotter temperature to stick.
>

--- In Homebrew_PCBs@yahoogroups.com, "Volkan" <v_sahin@...> wrote:
>
> I did some tests on dry film that is exposed with blue laser. You can find the
result files under
http://tech.groups.yahoo.com/group/Homebrew_PCBs/files/BlueLaser_LDI_Volkan/
folder.
> The minimum feature size that I achieved is 2.8/2.8  mil width and space.
There is no problem to print 1.4/1.4 mil width and space but development of the
dry film is a little bit problematic and it is not possible to do it with simple
tray technique. The film that I'm using has a thickness of 1.5 mil, according to
some google results the limit is 1.5*film thickness, so if it is true it seems
my results are almost at the limit.
>
> Volkan

Wow.

Any chance you would post a picture of the machine that did that work?

Or of how much it costs to make?

Wow.  Ok, now try the challenge... http://www.delorie.com/pcb/spirals/

Machine is not so much different than the one on youtube only difference is I
added laser head. If we ignore the engineering cost,  I spent ~$58 ($30 blue
laser, $25 housing+lens+~3$ laser driver electronics) for the laser head but it
was an upgrade to my inkjet printer. I think total cost can be around ~$130
including fpga+micro+x/y servo+pcb)

Volkan

Wow.



Any chance you would post a picture of the machine that did that work?



Or of how much it costs to make?

























[Non-text portions of this message have been removed]

I'll try but what will  happen at the end of this challenge? Any beer or wine?
:)
Volkan

--- On Mon, 11/23/09, DJ Delorie <dj@...> wrote:

From: DJ Delorie <dj@...>
Subject: Re: [Homebrew_PCBs] Blue Laser LDI Dry Film Results
To: Homebrew_PCBs@yahoogroups.com
Date: Monday, November 23, 2009, 1:30 PM







 











Wow.  Ok, now try the challenge... http://www.delorie. com/pcb/spirals/























[Non-text portions of this message have been removed]

Volkan Sahin <v_sahin@...> writes:
> I'll try but what will� happen at the end of this challenge? Any
> beer or wine?

Bragging rights, I suppose.  It's more of a "challenge yourself", not
a contest.

AutoTRAX EDA now comes in a free version with a 250 pin limits and no
other restrictions.

It does not time out.



For educational use, the full unlimited version is free. This does not
time out, even when you get a job!



It has both schematic capture and PCB layout.



You can get it now from http://www.kov.com/Download/AutoTRAXLite.aspx
<http://www.kov.com/Download/AutoTRAXLite.aspx>



Regards

Ilija





[Non-text portions of this message have been removed]

I bought a Brother HL-2170W about a month ago. I have not had a successful toner
transfer with it yet. Have had my laminator up to 350 *F and got few traces
actually transferred. I had a Minolta PagePro 1250W that worked great even with
refilled cartridges. When I switched to Vista, there where no drivers for it. I
ran it on my old XP computer for awhile, but it has started smearing the print.

One thing I like about the software that comes with the Brother is the ability
to do mirror print.

Does anyone know if the HP P1006  can do mirror print.

I do a lot of my boards with the free PCBExpress CAD and need to have mirror
print to get the top layer printed. Also what temperatures are folks using with
the HP P1006 to get transfers?

RD

This is wonderful !

I spent seven years to see something like that.

I think, that the next step would be use a polygonal mirror. Maybe, trying to
modify a laser printer.

Lucho

--- In Homebrew_PCBs@yahoogroups.com, "Volkan" <v_sahin@...> wrote:
>
> I did some tests on dry film that is exposed with blue laser. You can find the
result files under
http://tech.groups.yahoo.com/group/Homebrew_PCBs/files/BlueLaser_LDI_Volkan/
folder.
> The minimum feature size that I achieved is 2.8/2.8  mil width and space.
There is no problem to print 1.4/1.4 mil width and space but development of the
dry film is a little bit problematic and it is not possible to do it with simple
tray technique. The film that I'm using has a thickness of 1.5 mil, according to
some google results the limit is 1.5*film thickness, so if it is true it seems
my results are almost at the limit.
>
> Volkan
>

I would think using a mirror like that would cause  the sides of the exposed
area to not be vertical.


--- In Homebrew_PCBs@yahoogroups.com, "lmri2071" <lmri2071@...> wrote:
>
> This is wonderful !
>
> I spent seven years to see something like that.
>
> I think, that the next step would be use a polygonal mirror. Maybe, trying to
modify a laser printer.
>
> Lucho
>
> --- In Homebrew_PCBs@yahoogroups.com, "Volkan" <v_sahin@> wrote:
> >
> > I did some tests on dry film that is exposed with blue laser. You can find
the result files under
http://tech.groups.yahoo.com/group/Homebrew_PCBs/files/BlueLaser_LDI_Volkan/
folder.
> > The minimum feature size that I achieved is 2.8/2.8  mil width and space.
There is no problem to print 1.4/1.4 mil width and space but development of the
dry film is a little bit problematic and it is not possible to do it with simple
tray technique. The film that I'm using has a thickness of 1.5 mil, according to
some google results the limit is 1.5*film thickness, so if it is true it seems
my results are almost at the limit.
> >
> > Volkan
> >
>

If you use f-theta lens in front  of rotating  mirror this solves the problem
.


--- On Tue, 11/24/09, javaguy11111 <javaguy11111@...> wrote:

From: javaguy11111 <javaguy11111@...>
Subject: [Homebrew_PCBs] Re: Blue Laser LDI Dry Film Results
To: Homebrew_PCBs@yahoogroups.com
Date: Tuesday, November 24, 2009, 3:47 PM







 









       I would think using a mirror like that would cause  the sides of the
exposed area to not be vertical.



--- In Homebrew_PCBs@ yahoogroups. com, "lmri2071" <lmri2071@.. .> wrote:

>

> This is wonderful !

>

> I spent seven years to see something like that.

>

> I think, that the next step would be use a polygonal mirror. Maybe, trying to
modify a laser printer.

>

> Lucho

>

> --- In Homebrew_PCBs@ yahoogroups. com, "Volkan" <v_sahin@> wrote:

> >

> > I did some tests on dry film that is exposed with blue laser. You can find
the result files under http://tech. groups.yahoo. com/group/ Homebrew_
PCBs/files/ BlueLaser_ LDI_Volkan/ folder.

> > The minimum feature size that I achieved is 2.8/2.8  mil width and space.
There is no problem to print 1.4/1.4 mil width and space but development of the
dry film is a little bit problematic and it is not possible to do it with simple
tray technique. The film that I'm using has a thickness of 1.5 mil, according to
some google results the limit is 1.5*film thickness, so if it is true it seems
my results are almost at the limit.

> >

> > Volkan

> >

>

























[Non-text portions of this message have been removed]

Thanks. I'm working on rotating mirror, I've one scanner unit removed from laser
printer.

Volkan

--- On Tue, 11/24/09, lmri2071 <lmri2071@...> wrote:

From: lmri2071 <lmri2071@...>
Subject: [Homebrew_PCBs] Re: Blue Laser LDI Dry Film Results
To: Homebrew_PCBs@yahoogroups.com
Date: Tuesday, November 24, 2009, 2:35 PM







 









       This is wonderful !



I spent seven years to see something like that.



I think, that the next step would be use a polygonal mirror. Maybe, trying to
modify a laser printer.



Lucho



--- In Homebrew_PCBs@ yahoogroups. com, "Volkan" <v_sahin@... > wrote:

>

> I did some tests on dry film that is exposed with blue laser. You can find the
result files under http://tech. groups.yahoo. com/group/ Homebrew_ PCBs/files/
BlueLaser_ LDI_Volkan/ folder.

> The minimum feature size that I achieved is 2.8/2.8  mil width and space.
There is no problem to print 1.4/1.4 mil width and space but development of the
dry film is a little bit problematic and it is not possible to do it with simple
tray technique. The film that I'm using has a thickness of 1.5 mil, according to
some google results the limit is 1.5*film thickness, so if it is true it seems
my results are almost at the limit.

>

> Volkan

>

























[Non-text portions of this message have been removed]

Never heard of an f-theta lens. I looked it up on google, but I do not see how
that solves the problem unless you use a really big lens.


--- In Homebrew_PCBs@yahoogroups.com, Volkan Sahin <v_sahin@...> wrote:
>
> If you use f-theta lens in front  of rotating  mirror this solves the
problem .
>
>
> --- On Tue, 11/24/09, javaguy11111 <javaguy11111@...> wrote:
>
> From: javaguy11111 <javaguy11111@...>
> Subject: [Homebrew_PCBs] Re: Blue Laser LDI Dry Film Results
> To: Homebrew_PCBs@yahoogroups.com
> Date: Tuesday, November 24, 2009, 3:47 PM
>
>
>
>       I would think using a mirror like that would cause  the sides of the
exposed area to not be vertical.
>
>

I've never heard of it either, but i think you'll find one if you dismantle
a laser printer. It is a thin slice of a cylindrical lens. Its about as wide
as a sheet of paper.

On Wed, Nov 25, 2009 at 1:04 PM, javaguy11111 <javaguy11111@...>wrote:

>
>
> Never heard of an f-theta lens. I looked it up on google, but I do not see
> how that solves the problem unless you use a really big lens.
>
> --- In Homebrew_PCBs@yahoogroups.com <Homebrew_PCBs%40yahoogroups.com>,
> Volkan Sahin <v_sahin@...> wrote:
> >
> > If you use f-theta lens in front�  of rotating�  mirror this solves the
> problem .
> >
> >
> > --- On Tue, 11/24/09, javaguy11111 <javaguy11111@...> wrote:
> >
> > From: javaguy11111 <javaguy11111@...>
>
> > Subject: [Homebrew_PCBs] Re: Blue Laser LDI Dry Film Results
> > To: Homebrew_PCBs@yahoogroups.com <Homebrew_PCBs%40yahoogroups.com>
> > Date: Tuesday, November 24, 2009, 3:47 PM
> >
> >
> >
> > I would think using a mirror like that would cause the sides of the
> exposed area to not be vertical.
> >
> >
>
>
>


[Non-text portions of this message have been removed]

Check the document� OpticsForScanSystem.pdf from
http://www.sintecoptronics.com.sg/ref/index.html.� They've really good
information on their web about laser.

Volkan
--- On Tue, 11/24/09, James Bishop <bishopaj@...> wrote:

From: James Bishop <bishopaj@...>
Subject: Re: [Homebrew_PCBs] Re: Blue Laser LDI Dry Film Results
To: Homebrew_PCBs@yahoogroups.com
Date: Tuesday, November 24, 2009, 6:21 PM

I've never heard of it either, but i think you'll find one if you dismantle
a laser printer. It is a thin slice of a cylindrical lens. Its about as wide
as a sheet of paper.

On Wed, Nov 25, 2009 at 1:04 PM, javaguy11111 <javaguy11111@...>wrote:

>
>
> Never heard of an f-theta lens. I looked it up on google, but I do not see
> how that solves the problem unless you use a really big lens.
>
> --- In Homebrew_PCBs@yahoogroups.com <Homebrew_PCBs%40yahoogroups.com>,
> Volkan Sahin <v_sahin@...> wrote:
> >
> > If you use f-theta lens in front  of rotating  mirror this solves the
> problem .
> >
> >
> > --- On Tue, 11/24/09, javaguy11111 <javaguy11111@...> wrote:
> >
> > From: javaguy11111 <javaguy11111@...>
>
> > Subject: [Homebrew_PCBs] Re: Blue Laser LDI Dry Film Results
> > To: Homebrew_PCBs@yahoogroups.com <Homebrew_PCBs%40yahoogroups.com>
> > Date: Tuesday, November 24, 2009, 3:47 PM
> >
> >
> >
> > I would think using a mirror like that would cause the sides of the
> exposed area to not be vertical.
> >
> >
>
>�
>


[Non-text portions of this message have been removed]



------------------------------------

Be sure to visit the group home and check for new Links, Files, and Photos:
http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links








[Non-text portions of this message have been removed]

A positive photoresist is available in Europe and is called
"Positive20 Spray". Why can't we buy this in Canada or the US?

________________ Reply Header ________________
Subject: [Homebrew_PCBs] Positive Photoresist
Author: Terry Mickelson <tmlist@...>
Date:  25th November 2009 05:02

A positive photoresist is available in Europe and is called
"Positive20 Spray". Why can't we buy this in Canada or the US?


This message has not been fully downloaded. There is still 10 KB of text to be
retrieved.

----- Original Message -----
From: "Terry Mickelson" <tmlist@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Wednesday, November 25, 2009 4:02 AM
Subject: [Homebrew_PCBs] Positive Photoresist


>A positive photoresist is available in Europe and is called
> "Positive20 Spray". Why can't we buy this in Canada or the US?

Probably because it doesn't work, if it's the same stuff I tried a few years
ago. It used to work (I used it a lot), but the formulation was changed.

Leon

Has anyone used this stuff?

http://shop.rings-things.com/cart/pc/viewPrd.asp?idcategory=2850&idproduct=2
2663#details

Thanks,

Jim, K6JMG

I just went to their site and the full version is on sale through tomorrow for
$149 -- just click on the turkey

Now for the quandary?  Which do I get Diptrace or Autotrax?
Anyone have any advise they both look good.  Anyone have a comparison of the two
or a reviw of Autotrax


Craig

Volkan Sahin wrote:
> Thanks. I'm working on rotating mirror, I've one scanner unit removed
> from laser printer.


What is the time performance off your machine? Maybe you gave that
information on the uploaded files but i don't have access sorry.

Comparing your printing time to process off printing a mask, align on
pcb and expose is it longer even with small boards??

Was recently discussed here various ways to raster scan the laser,
mirrors, prims or rotate/shake the laser. But the precision work needed
to accomplish this worth the time improvement for small boards?

>From your schematics (thanks again for posting) the servo is driven by
the mcu and the quadrature decoder and position counter is on fpga. Do
you thing the machine mechanics will handle faster speeds? Because if
all the servo drive be on the fpga i guess the speed could be improved.
I realise that will be needed a big logic to make it maybe even more
complex than the common signal and printhead part. But the laser
assembly will the one you already have.

For the rotating mirror i see some difficulties. The rpm speed has to be
low enough as film sensitivity. And it's divided by the 6 mirror faces.
>From the values from Adam Seychell and some lost on mirror and lenses
maybe the rpm needs to be as slow as 100rpm. And maybe the mirror won't
be accurate enough at this speed. But don't know.
>From a fast look to the driver datasheet i didn't get relation between
external clock and rpm.

In laser printers surface photo effect is incredibly sensitive so it has
very fast scans but photoresists need more energy. And these optics sure
have laser power limits they can handle.

I sincerely expect you start selling you board soon. But i still got the
servo driving with fpga idea. Your board don't have more IOs for it but
there are things like ebay 280420650046 and the same seller has a nice
arm board too (i have other one). So please from you experience can the
mechanics allow more speed?


PS
Just more one long email from me BUT! I started writing this email
almost 2 hours ago because something hit my mind in between. Few days
ago on emc2 list someone asked if he could use vga port to drive the
servos drivers. And i start wonder if we could use the hsync signal for
raster sync and vsync for line step. Ok i am crazy its a fresh idea, but
has some potencial.
The laser is connected to one color and the others can be used for other
information. No fast realtime uplink signals needed. The problem is only
synchronization between the hsync and mirror position. This has to be
handled by external circuit. The hsync is much longer than the dot clk
and that is a problem too.
Imagine you have a full screen software with the normal software things
on top and on bottom the line to rast scan repeated more than 100 times.
All the lines on top will be used give time to the external circuit to
synchronise hsync with the 'zeroing' light sensor. At hsync any laser
signal is instantly blocked and a short pulse is given to laser as long
as the dot clock. If at that pulse the light sensor gets it so it's
synchronised if not the clock in the mirror driver should be modified
(maybe start fast and reducing rpm until synchronisation).
The circuit also has to block laser signal if no synchronisation. Know
in which line it's the raster lines and count successful rasted lines.
At 60hz or so vsync gives enough time to any cnc software to check if
the successful rasted lines are correct and move to next line.

Ok don't bother reply if not worth it.

Craig -
I just downloaded the lite version with 250 pin limit.  When the installation
key was delivered to me by email.  The email claims you can get the full
version, no limit for $99.

-jim

--- In Homebrew_PCBs@yahoogroups.com, "designer_craig" <cs6061@...> wrote:
>
> I just went to their site and the full version is on sale through tomorrow for
$149 -- just click on the turkey
>
> Now for the quandary?  Which do I get Diptrace or Autotrax?
> Anyone have any advise they both look good.  Anyone have a comparison of the
two or a reviw of Autotrax
>
>
> Craig
>

--- In Homebrew_PCBs@yahoogroups.com, "designer_craig" <cs6061@...> wrote:
>
> I just went to their site and the full version is on sale through tomorrow for
$149 -- just click on the turkey
>
> Now for the quandary?  Which do I get Diptrace or Autotrax?
> Anyone have any advise they both look good.  Anyone have a comparison of the
two or a reviw of Autotrax
>

For a feel of where AutoTRAX has been and is going, I'd suggest looking at posts
in the Yahoo group at: http://groups.yahoo.com/group/autotrax/

We have a fairly large and active group of users over there.


Regards, Bob Barr
(Yahoo AutoTRAX Group moderator)

Volkan Sahin wrote:
> Thanks. I'm working on rotating mirror, I've one scanner unit removed
> from laser printer.


>From my last loud thoughts one thing is not right, first i wrote about
10 rasted lines per second was the maximum (6faces 100rpm mirror) and
then 20µs line duration possibility (50KHz hsync).

If I get the thing right now, the maximum laser beam velocity on the
resist is 283cm/s, which makes just only 14 lines per second for a 20cm
wide board. Isn't possible to make the laser move linearly 2 times per
second? That will only be 7 time slower than the fastest possibility
with rotative mirror setup.

The vga signal gives 0.056mm max line width for 50khz hsync, which is
about the dot size for a complete line on monitor, not bad if hsync is
used for dot clk :|

The light on the resist need to be continue or can be interrupted
(multiple scan lines) until reach 60mJ/cm²?

Hello
Simao,



Please find my reply below your
questions. I hope I didn't do any miss calculations :).


>What is the time performance
off your machine? Maybe you gave that
>information on the
uploaded files but i don't have access sorry.



Current printer speed is  32”/sec in
bidirectional mode and 16”/sec in unidirectional mode.
I always use unidirectional mode
because of quality of the output it gives sharp well defined lines.

For example it takes 8 minutes to print
~8”x1.3” board in unidirectional mode at  720dpi resolution.




>Comparing your printing time to
process off printing a mask, align on
>pcb and expose is it
longer even with small boards??



I think so, I can live with this speed.
I'm working on rotating mirrors just for fun.


>Was recently discussed here
various ways to raster scan the laser,
>mirrors, prims or
rotate/shake the laser. But the precision work needed
>to
accomplish this worth the time improvement for small boards?
>From
your schematics (thanks again for posting) the servo is driven
by
>the mcu and the quadrature decoder and position counter is
on fpga. Do
>you thing the machine mechanics will handle faster
speeds? Because if
>all the servo drive be on the fpga i guess
the speed could be improved.
>I realise that will be needed a
big logic to make it maybe even more
>complex than the common
signal and printhead part. But the laser
>assembly will the one
you already have.



Higher speeds is not possible with this
mechanics at least X-axis motor won't survive.
BTW for the X-axis servo, I'm disabling
servo during printing, it just moves ~max speed between printing area
limits if it exceeds limits then servo is enabled.




>For the rotating mirror i see some
difficulties. The rpm speed has to be
>low enough as film
sensitivity. And it's divided by the 6 mirror faces.
>From the
values from Adam Seychell and some lost on mirror and lenses
>maybe
the rpm needs to be as slow as 100rpm. And maybe the mirror won't
>be
accurate enough at this speed. But don't know.
>From a fast
look to the driver datasheet i didn't get relation between
>external
clock and rpm.
New generation rotating mirror motors are PLL based
they have a clock input and PLL locks the motor speed to external
clock, so they should be  accurate. For example, if we're printing at
720dpi with 2.5microsecond exposure time, scanning of 8” width
material requires 14.4ms and if we have a 6 faced mirror motor speed
will be 694rpm



>In laser printers surface photo effect is incredibly
sensitive so it has
>very fast scans but photoresists need more
energy. And these optics sure
>have laser power limits they can
handle.
I don't know, I did some experiments at 200mW and did some
rough measurements it seems most of the power loss is because of the
45 degree mirrors and it is ~20% and total loss is around 30%

>I sincerely expect you start
selling you board soon. But i still got the
>servo driving with
fpga idea. Your board don't have more IOs for it but
>there are
things like ebay 280420650046 and the same seller has a nice
>arm
board too (i have other one). So please from you experience can
the
>mechanics allow more speed?
It is for my hobby,  I'm really
very bad to make things commercial.

I prefer to use my own designs because
of that I'm not buying any evaluation boards etc.

All servo in fpga do we really need? I
think we don't need such high speed servo calculations since the response
time of motors are really slow.





>PS
>Just more one long
email from me BUT! I started writing this email
>almost 2 hours
ago because something hit my mind in between. Few days
>ago on
emc2 list someone asked if he could use vga port to drive the
>servos
drivers. And i start wonder if we could use the hsync signal
for
>raster sync and vsync for line step. Ok i am crazy its a
fresh idea, but
>has some potencial.
>The laser is
connected to one color and the others can be used for
other
>information. No fast realtime uplink signals needed. The
problem is only
>synchronization between the hsync and mirror
position. This has to be
>handled by external circuit. The
hsync is much longer than the dot clk
>and that is a problem
too.
>Imagine you have a full screen software with the normal
software things
>on top and on bottom the line to rast scan
repeated more than 100 times.
>All the lines on top will be
used give time to the external circuit to
>synchronise hsync
with the 'zeroing' light sensor. At hsync any laser
>signal is
instantly blocked and a short pulse is given to laser as long
>as
the dot clock. If at that pulse the light sensor gets it so
it's
>synchronised if not the clock in the mirror driver should
be modified
>(maybe start fast and reducing rpm until
synchronisation) .
>The circuit also has to block laser signal
if no synchronisation. Know
>in which line it's the raster
lines and count successful rasted lines.
>At 60hz or so vsync
gives enough time to any cnc software to check if
>the
successful rasted lines are correct and move to next line.



I think it is a good idea, as far as I
know Sun Microsystems used similar concept in their laser printers.

>Ok don't bother reply if not
worth it.
It is really good for me, thanks for
asking all these questions, it is  a brain storming and creates new
ideas.
Volkan






[Non-text portions of this message have been removed]

Hi,
   if I have understood correctly, there are some thoughts that the laser will
move too fast to "develope" the light sensitive surface.
   My take is the following that you may or may not be able to slow down the
mirror motor, but you may also induce some problems of accuracy/wobble at the
same time, at least I feel that is possible.
   It is maybe possible to slow down the motor by 50% without altering accuracy
and repeatability too much......but more may be a problem.
   Then why not "scan" a line more than once? Would this not give the same
effect?
   Effectively, you need to move the pcb far slower (say 4 times slower) and
simultaneously scan say 4 times for each line (just as an example, you may need
to increase that number even more).
   Its a perfect job for a PIC to my mind to control a stepper motor (suitably
geared down to move the PCB exactly one line per step) after the 4 (for example)
scans have been made.....
   Well thats my 2 cents worth!!
   Its a really interesting blog Guys, many thanks.
   All have a great day.
   Regards
   Andy

[Non-text portions of this message have been removed]

This is not meant to be spam, I am a
loyal Eagle user, but thought someone
who is interested in using this tool
could take advantage of this price.

http://www.kov.com/Purchase/SpecialOffer.aspx

----- Original Message -----
From: "wb5kye100" <jflan@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Thursday, November 26, 2009 1:44 PM
Subject: [Homebrew_PCBs] Autotrax EDA + DEX for $99 Link - Today Only


> This is not meant to be spam, I am a
> loyal Eagle user, but thought someone
> who is interested in using this tool
> could take advantage of this price.
>
> http://www.kov.com/Purchase/SpecialOffer.aspx

That's actually a mistake! It should have read "$199". He is honouring the
price, though. I'd be very cautious about buying Autotrax EDA, it has always
had lots of problems - check the forum.

Leon