gEDA-user: Unusual uses of gEDA...
My latest project has five PCBs designed in gEDA/PCB. One of those oddball projects that uses PCB layout but no gschem or gnetlist. No netlist at all, in fact. http://www.evilmadscientist.com/go/eggbot A tricky part of this was the mask keepout on two of the boards-- I ended up drawing a separate layer for mask, and using it instead of the standard mask gerber. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Unusual uses of gEDA...
Windell H. Oskay wrote: http://www.evilmadscientist.com/go/eggbot me likes! :-) ---)kaimartin(--- -- Kai-Martin Knaak tel: +49-511-762-2895 Universität Hannover, Inst. für Quantenoptik fax: +49-511-762-2211 Welfengarten 1, 30167 Hannover http://www.iqo.uni-hannover.de GPG key:http://pgp.mit.edu:11371/pks/lookup?search=Knaak+kmkop=get ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Unusual uses of gEDA...
On 09/10/2010 06:24 AM, Windell H. Oskay wrote: http://www.evilmadscientist.com/go/eggbot A tricky part of this was the mask keepout on two of the boards-- I ended up drawing a separate layer for mask, and using it instead of the standard mask gerber. The black on white rules and logo look great Windell. I like the idea of an engraver for it -- then it could do promotional doo-dads and trophies for club events... I don't see any big unprinted areas where your custom mask is though, what triggered that need? Was the printing done as white soldermask and black silk layer? On FR-4, acrylic? The board material looks almost clear. John Griessen ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Unusual uses of gEDA...
On Sep 10, 2010, at 8:28 AM, John Griessen wrote: The black on white rules and logo look great Windell. I like the idea of an engraver for it -- then it could do promotional doo-dads and trophies for club events... The engraver is pretty neat-- it can make, for example, etched glass christmas ornaments. Here's one that we made at MakerFaire Detroit: [1]http://www.flickr.com/photos/lenore-m/4856324866/in/photostream/ The photo shows a dull-silver-painted glass ornament, engraved down to etched glass, and lit from within by a multicolor LED. I'm not sure that it's precise enough for trophies, but I bet there will be a lot of ornaments sent to gramma. :) I don't see any big unprinted areas In this photo, you can see a big square on the lower left piece and a big rectangle on the second piece from the top: [2]http://www.flickr.com/photos/oskay/4970320961/ If you look closely, you'll see that those two areas are not black ink but are silver colored: those are large mask-free areas that are HASL finished. The motors screw down to those two locations-- one fixed, the other slotted so that it can go to different positions . Without the mask, there's a good metal-to-metal thermal connection between the motor and the top copper. Those two boards have a copper flood going all the way to 20 mil from the board edges, which acts as a surprisingly effective heat sink for the motors. Was the printing done as white soldermask and black silk layer? On FR-4, acrylic? The board material looks almost clear. Yes, it's white mask and black silk on 100 mil FR-4. There's actually printing on both sides, so you'd see some of that if it were clear. The white mask is quite opaque. You can see the board edges somewhat in this photo, where the FR-4 has its usual translucency: [3]http://www.flickr.com/photos/oskay/4970933180/in/photostream/ We did some of our mechanical prototyping in 3 mm laser-cut acrylic. It's almost shocking how much stronger the FR-4 is. References 1. http://www.flickr.com/photos/lenore-m/4856324866/in/photostream/ 2. http://www.flickr.com/photos/oskay/4970320961/ 3. http://www.flickr.com/photos/oskay/4970933180/in/photostream/ ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Unusual uses of gEDA...
On 09/10/2010 11:45 AM, Windell H. Oskay wrote: The engraver is pretty neat-- it can make, for example, etched glass christmas ornaments. Here's one that we made at MakerFaire Detroit: [1]http://www.flickr.com/photos/lenore-m/4856324866/in/photostream/ The photo shows a dull-silver-painted glass ornament, engraved down to etched glass, and lit from within by a multicolor LED. I'm not sure that it's precise enough for trophies, but I bet there will be a lot of ornaments sent to gramma. :) So, if the engraver vibration is too fuzzy, how about adding force feedback control and a rotary tool? The force feedback would let you hold up the weight of the rotary tool, and probably help pickup and touch down at the same spots too. Does the eibot board have some spare inputs for feedback? John ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Unusual uses of gEDA...
On Sep 10, 2010, at 10:10 AM, John Griessen wrote: So, if the engraver vibration is too fuzzy, how about adding force feedback control and a rotary tool? The force feedback would let you hold up the weight of the rotary tool, and probably help pickup and touch down at the same spots too. Does the eibot board have some spare inputs for feedback? Interesting idea. We have used rotary tools with success, but they cost *a lot more,* and they're bulky and weigh a lot-- a little challenging for our motors without careful balance. The nicest results were with an air-powered dental drill. Adding force feedback would be possible, but also adds cost. Probably the best way to improve precision is just to increase the stiffness of the flexure hinge, meaning that there's less motion in undesirable degrees of freedom. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
