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2014-12-14 by Slavko Kocjancic
Just need to do some more calculations. The other one options is to use AVR with biggest ram to fit at least one scanline. So when buffer has at least one line
2014-12-14 by Camillus
Yes you have absolutely right, but drums are wasted with the toner cartridges all the time. And also what kind of photo resist is used on those drums. They
2014-12-14 by Camillus
I was thinking that the propeller would be a good device for this project, it hass 10 cogs ( independent cores you may say ) and one master that controls the
2014-12-13 by Harvey White
... Another way is to multiplex the address and data from application to application, so that half of the time, the AVR is writing to the RAM, and the other
2014-12-13 by Harvey White
... Hmmm, the copper is not photosensitive. To make it photosensitive, you d need a special kind of coating which is the same as on the drum. What the
2014-12-13 by Camillus
... The laser dot is just little under 1000dpi in size. But I have limited on off timings so the width I can controll is about 700DPI. But this is true only
2014-12-13 by Slavko Kocjancic
On 13. 12. 2014 11:39, Tony Smith ajsmith1968@gmail.com ... The laser dot is just little under 1000dpi in size. But I have limited on off timings so the
2014-12-13 by Slavko Kocjancic
As I m not so strong on math so I go with hard way. As Linuxcnc output is restricted to change with base_period the timing for the laser is in same range. So I
2014-12-13 by Tony Smith
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
2014-12-13 by Jeff Heiss
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
2014-12-11 by Camillus
Hi all, pcb making methode thinkerers, You all know that the basic concept of a laserprinter is that a laser writes a dotpattern on a electronically
2014-12-11 by Brad Thompson
On 12/11/2014 10:28 AM, Slavko Kocjancic eslavko@gmail.com ... I dimly recall that many years ago a company manufactured a drum-based PC-board engraver (or
2014-12-11 by Slavko Kocjancic
I saw few attempts too. Well wraping pcb to drum is near inposible. Using simple homemade CNC with laser attached has some drawback. If it s accurate then is
2014-12-11 by Boman33
I saw your video previously and I understand how it works. Maybe I misunderstood your comment in your previous email: Hello. ... It sounds like you have a
2014-12-11 by Slavko Kocjancic
youtube link posted below..
2014-12-11 by Boman33
Thanks Slavko for responding. Do you have a link where I can see the video description you mentioned? Bertho ... From: Homebrew_PCBs@yahoogroups.com
2014-12-11 by Slavko Kocjancic
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
2014-12-11 by Slavko Kocjancic
Hello... Didn t tryed. But I don t think that is good idea. The vinil will melt vhen board is soldered. And 20mW laser isn t strong enought to cut with ussable
2014-12-10 by Boman33
Very nicely done!! What software are you using to do the bitmap or vector to rotary control/firing? Bertho ... From: Homebrew_PCBs@yahoogroups.com
2014-12-10 by Slavko Kocjancic
On 10. 12. 2014 17:52, Jeff Heiss jeff.heiss@comcast.net ... I use locally produced photoresist (liquid) and striped out after etching by scrubbing. For now
2014-12-10 by Jeff Heiss
What solder resist do you use? Are you using photoresist as solder resist? Jeff From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
2014-12-10 by Slavko Kocjancic
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
2014-12-10 by Slavko Kocjancic
... Well I dissagre. BJT when used right can be pretty fast. At least 1MHz should be no problem. ... That s the question. I didn t find any data how fast is
2014-12-10 by Cristian
... BJT is slow. Use fets. Also, pre-heat the laser diode with some 10% current with a resistor. Why that speed? I guess you expose point by point. I
2014-12-10 by Slavko Kocjancic
With 20mW I can work pretty fast. But still the power is limiting factor. With 100mW laser I think I will hit other bariers like speed of scanning and even
2014-12-10 by Cristian
... No more than 120mW for uv photoresist exposure, otherwise you will experience strong reflections. Cristian
2014-12-10 by Slavko Kocjancic
Just one tought. If I move focal point for 1mm the trace goes quite narow. I focused now at about 80mm
2014-12-10 by Slavko Kocjancic
My laser is that cheapo... http://www.ebay.ie/itm/151023934656?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 Will try with that when received
2014-12-10 by Camillus
Verry interesting, but I had one more question. Did you ever tried to cover the pcb with vinyl used by signmaking? Wouldthe laser be able to cut ( burn ) true
2014-12-10 by Cristian
... Let me know, please the eBay number. 0.08x0.1 is very good. ... Be careful that more power means more copper reflections=large traces. ... Cristian
2014-12-10 by Slavko Kocjancic
Using photoresist and 20mW 405nm laser works nice. I use cheap ebay laser and got spot under 0.08mm in one direction and 0.1 in other (spot is oval not round.)
2014-12-10 by Jeff Heiss
I think there are two options to achieve a small spot size. The first is a collimating lens. The second is a fiber laser which is just a laser diode sold
2014-12-10 by Will
Hi All, Spray painting your own pcb material is much cheaper than pre-coated photo resist board. The pre-coated also has a lifetime. My US$0.02 worth or with
2014-12-09 by Camillus
why using the paint, this should also work with the presensitised clad boards. If you use a UV laser in the right wavelengt of the photoresist. I have being
2014-12-09 by Les Newell
I tried this with my 40W CO2 laser and didn t have much success. Even with air assist I couldn t get all of the paint off cleanly (or it re-deposited),
2014-12-09 by Howard Chester
Jeff posted, I’m mentally exploring the idea of spray painting copper clad with spray paint and drawing traces in the paint with a laser. After the laser,
2014-12-09 by Camillus
Well i gues that depends on the heat you can produce with an 3W Laser. I know it is possible to pop a latex balloon, so that makes me wonder, if you use latex
2014-12-09 by Jeff Heiss
I m mentally exploring the idea of spray painting copper clad with spray paint and drawing traces in the paint with a laser. After the laser, the board is
2014-12-08 by jtmiller47@...
Figured it out. Foil setting apparently gets the toner hot enough to act as an adhesive for making foil lettering. I ll use it along with a high temp setting.
2014-12-07 by jtmiller47@...
Finally getting around to doing some boards and hauled out the 1910 I bought ages ago. I ve lost the manual of course. What does the foil setting do on the
2014-12-01 by Homebrew_PCBs@yahoogroups.com
Monthly Reminder for Homebrew_PCBs list, please read: Messages and threads: Please do NOT start a new thread by replying to another message. Even if you change
2014-11-25 by dsimms4@...
Hi Chester, & all, Just re-found the article / walkthrough i read regarding Toner Transfer Paper;
2014-11-25 by dsimms4@...
Hi Chester, I ll try and find the previous thread you speak of. I did read something i found on a web sear about spraying ordinary paper with a silicon based
2014-11-25 by Howard Chester
Darren posted the question. ... Hello Darren,The idea of using grease-proof paper or Waxed paper for TT methods has crossed my mind in the past. However the
2014-11-25 by dsimms4@...
Hi Chester. Thank you for your input and concerns regarding the plastics. Sorry for my overdue reply. The idea,was to give the Lexmark E232 a complete service
2014-11-25 by dsimms4@...
Hi All, Just a quick question regarding the Toner Transfer method. This may already have been tried and written about, and i ve missed it. Has anyone ever
2014-11-21 by mosaicmerc@...
I did some updates...have a look!
2014-11-20 by mosaicmerc@...
Hi Graham: I am refining the whole write up.....as it has been pointed out that very detailed descriptions are required to enable others to improve the mod. as
2014-11-19 by gebowes@...
I also had no problems with virus warnings on the Hackaday site. This looks like an interesting project but the documentation is incomplete and it cannot
2014-11-17 by mosaicmerc@...
You mean the hackaday site? Odd, I am running Norton Internet Security (licensed ) and Malwarebytes (premium licensed, full versions). No problems.