Er... I didn't do those.... I just transferr ed the link.    The idea could be built upon.

But I DID just make my first video.... I thought it was funny that when I meant to say "This is my first video so.....pl ease bear with me as I try to "articulat e" this demonstra tion", instead I clumsily said "awticulat e".  

http://www.youtube.com/watch?v=6s5oP2ihMuQ&feature=player_embedded#!

I thought this idea using gears was...wel l... cute!

http://www.youtube.com/v/CIGa52qPVvA?version=3&hl=en_US

Ditto..Aw esome!  That's an interesti ng asteroida l nozzle. I'm guessing has to do with temperatu re control. It looks like insulatio n used to contain the heat for accurate sensing.

I'll be checking back in a few minutes.. ..as youtube has instructe d me to do.  

Thanks,
John

More than...
..just curious.  

Thanks,
John

This feature is so neat!(among all the others)  


Thanks,
John

Okay! Now that I look harder, I see wires circling one leg of the platform. I guess those might be the electrica l connectio ns to the heated platform.   Yah, I meant the platform and not the actual xy table.
Thanks for that pdf of the traces on the platform.

I will look into obtaining just the extruder/heater unit.

One more queation. ..
What keeps the molten "plastic" (ABS?) from oozing out of the top instead of only at the nozzle?  Is there some sort of "O"-ring in there that seals the wire/filament as it enters the heat chamber?  Or is it just the presssure of the leading unmelted wire against the nozzle.
 I'm sure there must be cut-away diagrams depicting this.  I'll look around the web more closely.  

 Well, either way I will find out when I settle on what heater/nozzle to use.

Thanks Dan again for your continued support

John

Thanks Dan,
  Wow! that gear is a lot smaller than I initially thought!
There are quite a few flavors of the extruder available out there.
all of those(that I have seen) also use a stepper motor as the force to move the wire.
I've got a few very small 48V servo motors from a ebay buy.  I was thinking the stepper could be replaced with a 4th axis servo.  The others would be used to cobble together a fairly tight three axis PCB table upon which to create the gears.... .for fun of course!  

Or am I making it harder than it is?  

Also, From the pictures you posted, I can't tell if you are heating the table, or if you heated it from the start for sticktion . Maybe the table material you use allows for adhesion with the ABS?


Thanks for the info.
John

Hi Dan,
I impressed with the gear you extruded!  I was wondering if you had posted somewhere pictures of your Z axis setup.
If not, would it be possible to put up a few shots of your stepper extruder system?  ...and too, would the extruder also work using a servo unit with encoder?

Thanks,
John (Bloy)
 

This original wood-gear clock design is powered by air from an ordinary aquarium pump. It employs the same motive concept as a piston-driven steam locomotiv e, although it looks different because the piston linkages are folded to fit the frame. It also features a Huygens retaining power loop and a Harrison grasshopp er escapemen t.

http://www.youtube.com/watch?v=JIQd_wlp2Gc

Hey Art!   Very nice mechanism you created.  It works FAST too!

Time IS on your side.  Hehe

Here's a video of a nice clock.
This leads to other vids of various clock works

http://www.youtube.com/watch?v=UUu8qD1a15Y&feature=mfu_in_order&list=UL

Just for the record, I too am registere d to Jim Donnelly.  It won't accept my license file.

heh! Always in character, Sir John....

Is this it?
 
http://www.youtube.com/watch?v=2KZVbsfQJQg

seriously, here's an e-book preview that you can scroll through for various types of rack and snail mechanism:

http://books.google.com/books?id=iVkFJs5XkjQC&pg=PA52&lpg=PA52&dq=rack+and+snail+mechanism&source=bl&ots=Vy4KnC27jQ&sig=bosmXyeLqw27w6bBleAKs-CnHJo&hl=en&sa=X&ei=IZHzTpLcHNPuggehlrytAg&ved=0CD8Q6AEwAg#v=onepage&q=rack%20and%20snail%20mechanism&f=false