Lasersaur v12.08 revision, beta phase commences
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Stefan Hechenberger
May 3, 2012, 4:04:21 PM5/3/12
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Hi Laser people,
We have been working on a major revision for quite some time. It's an
accumulation of many improvements and optimizations. Hyperwerk, Basel
and Studio for Creative Inquiry, CMU made v12.08 possible through their
kind support.
http://labs.nortd.com/lasersaur/manual/revisions
http://www.flickr.com/photos/stfnix/7119387955
http://www.flickr.com/photos/girlontheles/7080713199/
http://www.flickr.com/photos/stfnix/6973307346
A speed test of the new gantry:
http://vimeo.com/40421390
At this time the BOM is ready for ordering and I know some of you have
been waiting to get started with it asap. The CAD model is mostly ready
and should be fully in sync soon (mostly updates to fasteners left). As
there is currently very little documentation the build process is a bit
harder and we generally only recommend it to people comfortable building
from CAD model. That being said, we will be on stand-by on the mailing
list to address any open questions and issues.
http://labs.nortd.com/lasersaur/manual/bom
http://labs.nortd.com/lasersaur/manual/alpha_and_beta
http://www.flickr.com/photos/stfnix/7139609703/in/photostream
Happy Building,
--
Stefan Hechenberger, Nortd Labs
http://labs.nortd.com | http://blog.nortd.com
Gabriel Helms
May 3, 2012, 7:59:12 PM5/3/12
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Has anyone done a cost/benefit analysis of using servos vice stepper motors? How hard would it be to use servos in the new build? Would that require a lot of reprogramming?
Thanks,
Gabriel
Sent from my iPhone
Thanks,
Gabriel
Sent from my iPhone
jet
May 3, 2012, 8:18:51 PM5/3/12
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I haven't done a CBA, but I am interested in trying it out once my
cutter is back to cutting again. (It's in pieces in my garage while I am
setting up exhaust and N injection.) On my CNC mill I use 24V servo
motors with rotary encoders, driven by Gecko controllers attached to a
Bob Campbell driver. (It's all commercial, you can get a good overview
here: <http://campbelldesigns.net/>. ) To give you an idea of scale, my
power supply is something like 60A 24V, the two capacitors are the size
of soda cans: <http://www.flickr.com/photos/allartburns/7096910161>
Until now, my preference is to go this way because you can know where
the cutter on the mill is any time you want. If G1 x100 y100 only makes
it to x80 y80 due to a hang, the code will know.
It's also a good first level of memory switch -- if the cutter is flying
at full speed and bangs into a limit switch, things can get damaged or
knocked out of alignment. With a closed-loop system the code can trip a
limit like "I'm 10% from the edge and going waaaaaay" too fast and
override the instructions or shut the box down.
It also makes it easier to do cool things like put a contact switch on
the corner of the media, touch the tip to that switch, then call that
0,0,0. Alternatively, you can declare a fixed point in the mill 0,0,0
with a contact switch and use that as a layout guide when putting
material on the mill.
For the commercial lasercutters, the 0,0 point tends to be a hard corner
on the bed and the cutter driver is physically capable of knowing how to
get there. That's what I'm thinking of doing with mine, but I'm not
there yet.
--jet
--
J. Eric Townsend, IDSA
design <http://www.allartburns.org>
hacking <http://www.flatline.net>
fabrication <watch this space>
cutter is back to cutting again. (It's in pieces in my garage while I am
setting up exhaust and N injection.) On my CNC mill I use 24V servo
motors with rotary encoders, driven by Gecko controllers attached to a
Bob Campbell driver. (It's all commercial, you can get a good overview
here: <http://campbelldesigns.net/>. ) To give you an idea of scale, my
power supply is something like 60A 24V, the two capacitors are the size
of soda cans: <http://www.flickr.com/photos/allartburns/7096910161>
Until now, my preference is to go this way because you can know where
the cutter on the mill is any time you want. If G1 x100 y100 only makes
it to x80 y80 due to a hang, the code will know.
It's also a good first level of memory switch -- if the cutter is flying
at full speed and bangs into a limit switch, things can get damaged or
knocked out of alignment. With a closed-loop system the code can trip a
limit like "I'm 10% from the edge and going waaaaaay" too fast and
override the instructions or shut the box down.
It also makes it easier to do cool things like put a contact switch on
the corner of the media, touch the tip to that switch, then call that
0,0,0. Alternatively, you can declare a fixed point in the mill 0,0,0
with a contact switch and use that as a layout guide when putting
material on the mill.
For the commercial lasercutters, the 0,0 point tends to be a hard corner
on the bed and the cutter driver is physically capable of knowing how to
get there. That's what I'm thinking of doing with mine, but I'm not
there yet.
--jet
J. Eric Townsend, IDSA
design <http://www.allartburns.org>
hacking <http://www.flatline.net>
fabrication <watch this space>
Jeff Nordhues
May 3, 2012, 10:15:40 PM5/3/12
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Hi Stefen,
Parts are ordered, they should hopefully arrive over the next two weeks, then gladly yet sadly I will be traveling for a week, so it will be 3 weeks realistically before I can start to build - but I will keep the group posted via photos on flickr. It would be great to hear from the other members too who are going forward with a v12.08 build -
Thanks for all the hard work -
Jeff.
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