Laser Cutting Files

[Kirais]

I use Inkscape to open the files. I found that the width of holes are around 6.43mm. Is that the problem of the software? Are they supposed to be of 8mm width? So I have to scale the file up a bit, right?

[MatthiasWM]

I used InkScape on the Mac and found the scale to be completely wrong. I rescaled the drawing using a know size and calculating the new scale. The name of the file gives you the length of the edges in the inner colored rectangle (the laser cutter outlines). I think that my drawings are now correct DXF - I will tell you after I cut all parts out and try to assemble them ;-)

[digitalw00t]

Has anyone redone the files to match english measurement acrylic? If you say "5mm and 8mm" here in the states, you are going to pay through the nose for it.

./Andrew

On Sun, Jan 27, 2013 at 1:51 PM, MatthiasWM notifications@github.comwrote:

I used InkScape on the Mac and found the scale to be completely wrong. I rescaled the drawing using a know size and calculating the new scale. The name of the file gives you the length of the edges in the inner colored rectangle (the laser cutter outlines). I think that my drawings are now correct DXF - I will tell you after I cut all parts out and try to assemble them ;-)

— Reply to this email directly or view it on GitHubhttps://github.com/Pwdr/Pwdr-Model-0.1/issues/14#issuecomment-12760112.

./Andrew

[MatthiasWM]

8mm is almost 5/16th if you can get that, 3/16th is almost 5mm

[digitalw00t]

So those will fit enough to work with the patterns provided? I know they are close.. but will they be close enough to work.

On Sun, Jan 27, 2013 at 2:39 PM, MatthiasWM notifications@github.comwrote:

8mm is almost 5/16th if you can get that, 3/16th is almost 5mm

— Reply to this email directly or view it on GitHubhttps://github.com/Pwdr/Pwdr-Model-0.1/issues/14#issuecomment-12761058.

./Andrew

[MatthiasWM]

I think they would. A bit smaller is OK because they still fit into all the slots, and the screws will tighten everything up sufficiently. You can probably use fractional nuts and bolts as well for most parts.

[Kirais]

To Matt: I found the same problem. There are quite a few problems with the files and the bill of parts. Hope that we can improve on that soon. I read you blog, and good to know you are using wood frame to replace acrylic. I want to cut cost too. I am planing to order the parts this week. Hope to hear more from you.

Regards, Kirais

On 28 Jan, 2013, at 3:51 AM, MatthiasWM notifications@github.com wrote:

I used InkScape on the Mac and found the scale to be completely wrong. I rescaled the drawing using a know size and calculating the new scale. The name of the file gives you the length of the edges in the inner colored rectangle (the laser cutter outlines). I think that my drawings are now correct DXF - I will tell you after I cut all parts out and try to assemble them ;-)

\ Reply to this email directly or view it on GitHub.

[digitalw00t]

I'm going to build with acrylic initially, get a base line on how well it works, then I'll see about replacing 3 of the walls with a sheet of ABS, and leave the front acrylic so you can see through it. I'm not sure how well it'll work, but it would cut costs.

./Andrew

On Sun, Jan 27, 2013 at 11:50 PM, Kirais notifications@github.com wrote:

To Matt: I found the same problem. There are quite a few problems with the files and the bill of parts. Hope that we can improve on that soon. I read you blog, and good to know you are using wood frame to replace acrylic. I want to cut cost too. I am planing to order the parts this week. Hope to hear more from you.

Regards, Kirais

On 28 Jan, 2013, at 3:51 AM, MatthiasWM notifications@github.com wrote:

I used InkScape on the Mac and found the scale to be completely wrong. I rescaled the drawing using a know size and calculating the new scale. The name of the file gives you the length of the edges in the inner colored rectangle (the laser cutter outlines). I think that my drawings are now correct DXF - I will tell you after I cut all parts out and try to assemble them ;-)

\ Reply to this email directly or view it on GitHub.

— Reply to this email directly or view it on GitHubhttps://github.com/Pwdr/Pwdr-Model-0.1/issues/14#issuecomment-12769434.

./Andrew

[MatthiasWM]

OK, I have tried to convert the CAD files for the carriages (X, Y-left, and Y-right) to OpenSCAD:

http://www.matthiasm.com/pwdr_01.html

OpenSCAD is like a programming language for CAD drawings. The first few lines of the file define material thickness , bolt sizes, bearing size, etc. . I hope that the result is good enough to allow 4mm material being used without changing the CAD file. This would also work for imperial sizes.

The files are available via my blog, but beware, they are untested!

• Matthias

[Kirais]

Nice blog post. I notice that you want to improve the printhead in the future. I have done some research on that. It seems that HP 6602A is the only one fully hacked. It is not easy to change the printhead, but I would love to your work. Maybe you are able to hack some great print heads? Looking forward to that.

Regards, Kirais

On 29 Jan, 2013, at 8:15 AM, MatthiasWM notifications@github.com wrote:

OK, I have tried to convert the CAD files for the carriages (X, Y-left, and Y-right) to OpenSCAD:

http://www.matthiasm.com/pwdr_01.html

OpenSCAD is like a programming language for CAD drawings. The first few lines of the file define material thickness , bolt sizes, bearing size, etc. . I hope that the result is good enough to allow 4mm material being used without changing the CAD file. This would also work for imperial sizes.

The files are available via my blog, but beware, they are untested!

Matthias \ Reply to this email directly or view it on GitHub.

[MatthiasWM]

The HP 45 ink cartridge delivers 600 dpi in a 1/2" swash. It is extremely robust (used in large format printers), has a high capacity, and is explained in minute detail in this patent: US5946012.

There is one candidate I like more for its compactness which is a 5-color all-in-one Canon PIXME MP640 head. It supports continuous ink supply, lasts very long, and can be replaced for $65 for all colors at once. It also provides 3 different jet sizes for each color. This head seems to be the perfect combination of long life, all required colors, finest resolution, high speed, and price - however, it is not documented AFAIK.

[digitalw00t]

And no AFAIK would be the killer.

On Wed, Jan 30, 2013 at 12:46 AM, MatthiasWM notifications@github.comwrote:

The HP 45 ink cartridge delivers 600 dpi in a 1/2" swash. It is extremely robust (used in large format printers), has a high capacity, and is explained in minute detail in this patent: US5946012.

There is one candidate I like more for its compactness which is a 5-color all-in-one Canon PIXME MP640 head. It supports continuous ink supply, lasts very long, and can be replaced for $65 for all colors at once. It also provides 3 different jet sizes for each color. This head seems to be the perfect combination of long life, all required colors, finest resolution, high speed, and price - however, it is not documented AFAIK.

— Reply to this email directly or view it on GitHubhttps://github.com/Pwdr/Pwdr-Model-0.1/issues/14#issuecomment-12876662.

./Andrew

[MatthiasWM]

I added some more information on alternative ink heads on my page, towards the bottom: http://matthiasm.com/pwdr_01.html . The information includes order numbers for the carriages. The HP stuff is quite well known, but we need five colors and the carriages have only four spaces. The Canon head seems a perfect fit to me as it has five spaces and is very fast - but we have no clue how it is controlled... .

[digitalw00t]

Yeah.. it can be learned with trial n error, but it will mean going through a ton of heads.

On Wed, Jan 30, 2013 at 6:08 PM, MatthiasWM notifications@github.comwrote:

I added some more information on alternative ink heads on my page, towards the bottom: http://matthiasm.com/pwdr_01.html . The information includes order numbers for the carriages. The HP stuff is quite well known, but we need five colors and the carriages have only four spaces. The Canon head seems a perfect fit to me as it has five spaces and is very fast - but we have no clue how it is controlled... .

— Reply to this email directly or view it on GitHubhttps://github.com/Pwdr/Pwdr-Model-0.1/issues/14#issuecomment-12920261.

./Andrew

[MatthiasWM]

Well, we can do some reverse engineering with a scope and a logic analyser. Maybe someone can search for manuals and patents. These printers are old enough to end up in the junk pile, so what if we ruin a few ;-)

[digitalw00t]

That's what I like to hear!!!

On Thu, Jan 31, 2013 at 8:45 AM, MatthiasWM notifications@github.comwrote:

Well, we can do some reverse engineering with a scope and a logic analyser. Maybe someone can search for manuals and patents. These printers are old enough to end up in the junk pile, so what if we ruin a few ;-)

— Reply to this email directly or view it on GitHubhttps://github.com/Pwdr/Pwdr-Model-0.1/issues/14#issuecomment-12945387.

./Andrew

[Pwdr]

I suggest to close this issue and continue to talk on other inkjet heads in a new issue.