It does, you know. You just have to get it hot enough.

Tuesday, January 17, 2012

head bumps and reading skills

One of the things the docs warned me about in rehab was that post bonking my head I might perceive reality a bit differently than before. I’ve noticed a few minor kinetic bits here and there, but they’re mostly related to two weeks of being in bed and losing some of my muscles. (I can play catch and walk backwards already, not sure I could do that before the fall…)

However, after bonking my head in the basement I also found the latest Jameco catalog, and something about it just isn’t right.

posted by jet at 17:39  

Friday, October 28, 2011

why have a 3d printer, redux

Awhile back I made a simple stand for the NookColor (that I posted to thingiverse) and sometime in the past few months I apparently lost it, as I can’t find it now.

I discovered this while getting ready to assemble my Mk.7 Stepstruder and realized I could print another pair out faster than I could dig through the entire house looking for the first set I printed.

Which makes me wonder — why can’t I do this when I can’t find the cap for my pen or some random generic plastic part for a battery pack? If it’s easier to print one out than find it, what happens when I find the one that I lost? Toss the one I printed in the Imaginary ABS Recycling Bin?

posted by jet at 22:30  

Tuesday, October 18, 2011

So why would someone own a laser cutter?

I asked a similar question almost a year ago, Why would someone own a 3d printer?.

Is the answer different? In my limited experience, yes. You can make a lot of useful things with a laser cutter, but it’s not as trivial to own as a 3d printer. To begin with, the laser cutter is far more dangerous to operate than a 3D printer. Most of us think of cheap red laser pointers when we think “laser”, but those a far cry from a Class IV “cutting” laser that can sever a finger or permanently blind you.

Oh, and it’s invisible. An invisible laser that can permanently maim or kill you. Thus the various safety interlocks that prevent the machine from operating when the door is open, just like a microwave oven.

That being said, I think laser cutters are in the same class as “professional” 3d printers used in manufacturing. It’s probably not something you would own as much as something the local co-op or library or commercial printing shop would own, maintain, and use for you. When you need a stack of flyers printed and go to the local print shop, they run the machine for you, it’s not going to be much different than that.

The other issue is finding a place to use it safely. Laser cutters are safe to operate in self-test/alignment mode, but as soon as you start cutting and etching you run into the problem of toxic fumes.

Most of the media I’ve seen go through a laser cutter has been acrylic, polycarb, and other plastics — all of which generate some seriously nasty fumes when they are etched or cut. My experience is that the warnings in the Plexiglass(r) MSDS are %100 correct. Not only do you need space for a laser cutter, you need an exhaust fan that can move a lot of air outside very quickly. (The commercial Epilogs I’ve used had fans that were loud enough to drown out normal conversation, I don’t know who specified them so they might have been overkill.) Cutting / etching wood has similar problems — lots of smoke from the wood and whatever byproducts come from burning the glue if you’re cutting plywood. Paper’s not really a problem, and cutting PVC and some other materials will actually destroy the lens so those aren’t cut in the first place.  [Edit: When laser cut, PVC releases free chlorine gas which combines with atmospheric oxygen to form hydrochloric acid which is bad for the mechanicals.  I suppose If you had a laser cutter filled with an inert gas it only be a matter of safely disposing of the exhaust gases.]

So going back to the original question, I think the answer for now is “because they can”. If you have the space (a big garage or a studio/hackerspace) and time (I’ve got 50+ hours into my lasersaur build) it’s certainly an experiment worth trying.

posted by jet at 12:16  

Tuesday, March 8, 2011

late night design du jour — kinect tripod adaptor

I was going to cut an adaptor plate out of aluminum, but my pal Golan challenged me to do something on a Makerbot/Reprap that used as few non-printed parts as possible.

Final version requires one non-printed part, a 1/4-20tpi jam nut:
3D printable Kinect Tripod Adaptor

(If you have a high-quality printer, you could print a threaded insert.)

posted by jet at 22:13  

Monday, January 17, 2011

experimenting with a shapeways store

I’m starting to experiment with a shapeways store.

Currently there’s just an antenna mount of interest only amateur radio people, but I’m working on a few more items on the store that I am prototyping with my Makerbot Cupcake before uploading to Shapeways.

posted by jet at 22:21  
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