-
Notifications
You must be signed in to change notification settings - Fork 55
New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
any thoughts on the new silouette portrait? #1
Comments
I think it's likely that the Portait will work in the same way, but since I don't have one, I can't be certain. Please try it out if you're able to. You may have to experiment with the offset setting along the x axis because of the Portrait's smaller span in that direction. |
I ordered one, was about $80 cheaper on amazon. They claim the internals -Reza On Feb 7, 2013, at 4:05 AM, Peter Monta notifications@github.com wrote: I think it's likely that the Portait will work in the same way, but since I — |
Got it in, used vmware to run your code on a linux image. The drive was It'll be a few more weeks before I need to make stencils with it, so By the way, one annoyance is that the bits that get cut are stuck on the Thanks, Peter Monta wrote:
|
Sounds good. I have a blog post with a bit more detail here: http://pmonta.com/blog/2012/12/25/smt-stencil-cutting/ Your scanned image looks reasonable---it seems to be the output of a few of the test scripts. If you haven't done so already, you may want to try the gerber files in the examples directory (such as test_0.5mm_0402.gbr). I've had good luck with mylar, and it's less expensive than kapton. The high-temperature capability of kapton may not be needed for stencil applications. Cheers, |
I have a large roll of kapton that I was going to use in a laser cutter Where do you get your Mylar? -Reza On Feb 9, 2013, at 1:07 AM, Peter Monta notifications@github.com wrote: Sounds good. I have a blog post with a bit more detail here: http://pmonta.com/blog/2012/12/25/smt-stencil-cutting/ Your scanned image looks reasonable---it seems to be the output of a few of I've had good luck with mylar, and it's less expensive than kapton. The Cheers, — |
trying out the test pattern now, it's doing a lot of back and forth thanks Peter Monta wrote:
|
Yes, the back-and-forth is to be expected---it's there to guarantee that a cut segment is always approached from the same direction, to eliminate any backlash in the positioning mechanism for better accuracy. It makes a noticeable difference, at least on my machine. You can try "--cut-mode 1" for faster speed, but you will see knife-drag distortion at the corners and backlash problems. Might be okay for large features (0805 pads and up). My tendency is to go for best accuracy even if I have to wait a long time (overnight say). I should write a short note on computing the matrix, but briefly, "--matrix a,b,c,d" maps each point (x,y) in the gerber file to (ax+by, cx+dy) in device coordinates. So when you print the calibration pattern, if the distance between pattern groups along the x axis (the axis parallel to the main machine guide rods) is, say, 1% too large, then you should make the matrix "a" coefficient 0.99 to compensate. Similarly for the y-axis and the matrix "d" coefficient. That leaves "b" and "c", which control coupling between the two axes, which happens when the axes are not perfectly orthogonal. This is where the two calibration groupings at 45 degrees and -45 degrees come into play. If their distances differ, then you want to adjust "b" and "c" to compensate. To verify, print out the calibration pattern again using the candidate matrix; if you then get exactly equal distances in x, y, 45deg, and -45deg, and they're all equal to the intended distance (which I think is 5.00 inches on my example pattern), then you're done. As for shrinking the pads, it did seem like the best place to do the processing was the PCB tool. It would be possible with just the gerber files, but I wanted to avoid parsing them; pstoedit removes the knowledge about pads and just dices them into individual segments, so it's then ambiguous in which direction to move the segments to implement the shrink. If your gerber file has no polygons (just apertures), which is usually the case for paste layers, you can edit the aperture header manually to shrink all the pads, if that seems preferable to using the CAM features of the PCB layout tool. Cheers, |
I got my Mylar sheets, adhesive backing sheets, and adhesive residue remover from Amazon: http://www.amazon.com/gp/product/B00006HOY8/ref=oh_details_o04_s01_i01?ie=UTF8&psc=1 Cheers, |
I could be mistaken but it seemed like the antibacklash mechanism made each -Reza On Feb 15, 2013, at 8:16 PM, Peter Monta notifications@github.com wrote: Yes, the back-and-forth is to be expected---it's there to guarantee that a I should write a short note on computing the matrix, but briefly, "--matrix As for shrinking the pads, it did seem like the best place to do the Cheers, — |
The initial print looked really nice, though I just used the cutting I was wondering how the scripts would handle circular/oval pads - given Thanks, Peter Monta wrote:
|
I'll check whether the code and machine movements are doing the right thing for approach direction. I haven't tried any oval pads, but my test pattern has some circular ones. I believe pstoedit makes either 8- or 16-sided polygons out of them. Any segments which are within the same 2*pi/16 bin I draw in the same "pass", since the knife has to rotate only a very small amount. Can you put your oval-pad gerber file somewhere so I can look at the output? I should include a small verification tool to back-render the final graphtec output to PDF for ease in checking. Maybe include some small arrows to represent the stroke direction. |
my technique on how to deal with chads: http://rethinkmedical.com/cms/blog.php. |
Was there any conclusion on using the portrait? I got mine today and i'm very disappointed by the results. http://i.imgur.com/5Uch9dV.png Maybe the parameters everyone on the internet uses don't work well for the portrait. |
Mine works great. I use Kalyan film and you still have to manually Remove the chads. I make my own disposable backing using adhesive spray on a Mylar folder half.
|
@thethereza can you share the params you're using for the portrait? (those are not chads btw, the stencil is completly ripped apart for fine pitch components) |
It's on a computer I don't use often. Pressure is 30, don't remember the rest.
|
@thethereza do you get more runs than specified with --force too? i.e. "--force 8" will run twice or three times |
i just do --speed 3 --force 30 (up to 40). -r Arvid E. Picciani wrote:
|
@pmonta Hi Peter. I'm trying new Portrait device under Mac OS, but it doesn't appear in |
@sergeyzwezdin Mac OS doesn't mount the Portrait, because it doesn't present itself as a standard device class. I just cut a stencil on my Portrait (USB VID/PID 1123:0B4D) using it.
The resultant stencil (fed as media, not mat) ended up at (4,4) to (7.6,9.3). I use Gorilla Tape to remove the chads from the sticky mat. |
@bikeNomad Thank you! Very helpful! |
No description provided.
The text was updated successfully, but these errors were encountered: