RE: [CAD_CAM_EDM_DRO] 3D Printing

Scott:

Just a few quibbles with what you wrote:

2) G-code in Z is not reversed, at least not inteh conventional sense of
reversal. Raising teh Z axis still makes teh Z coordinate go more positive.
It is true that you start negative and work toward teh positive, instead of
teh other way around as in milling.

3) Torque is not the enemy, rather it is inductance, which limits the speed
of the motors. A torquey machine that can move at the required high speeds
will work fine.

Andy Wander


_____

From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Scott A Tovey
Sent: Tuesday, December 18, 2012 3:23 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: RE: [CAD_CAM_EDM_DRO] 3D Printing




Some things to take into consideration that
were not mentioned.

1. Using an Arduino, especially one which has a
Micro SD or SD slot for a flash drive allows
you to start the print and disconnect from your
PC.

2. G-Code in the Z-axis is reversed to that of milling as milling your
removing material, but in printing your adding material.

3. While typical CNC looks to have the beefiest motors for the additional
torque, to much torque is detrimental to good quality prints. It has been
found that Nema 17's are the best suited for 3D printing using an extruder.

You will need an interface like PronterFace.
https://github.com/kliment/Printrun

This program has Slic3r integrated into it so you can choose to use it to
generate g-code from your dxf files for printing and send it to the printer.
PronterFace is also the controller software for many 3D printers. You can
also use Slic3r separately if you wish.

Scott A. Tovey
--------------------------------------------------

Truth without love is brutality,
and love without truth is hypocrisy.
-Warren Wiersbe

Tough Love is not love,
It is an act of war.
-Scott A. Tovey

--- On Tue, 18/12/12, Tony Smith <ajsmith1968@...
<mailto:ajsmith1968%40gmail.com> > wrote:

> From: Tony Smith <ajsmith1968@... <mailto:ajsmith1968%40gmail.com> >
> Subject: RE: [CAD_CAM_EDM_DRO] 3D Printing
> To: CAD_CAM_EDM_DRO@yahoogroups.com

<mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>

> Date: Tuesday, 18 December, 2012, 2:25 PM
> > > The rest (XYZ) is standard
> CNC stuff, the extruder can be the A Axis,
> > > it only runs one direction at a set speed so
> that's not rocket science.
> > I agree about the pid controller. But the statement
> about the extruder
> only
> > running one direction is erroneous.
> > The extruder does back up from time to time to prevent
> drool when not
> > extruding. Still just G-code, though.
> >
> > Most printers are way faster than most routers. If your
> router uses single
> start
> > lead screws, it is likely too slow.
>
>
> I've done fluid dispensers that retract for the same reason,
> makes sense the
> plastic extruder would as well. Still, as you say it's
> just another line of
> g-code.
>
> Some routers are pretty quick, especially the belt drive
> ones for wood.
> Milling machines (for steel etc) tend to be on the slow
> side. The project I
> mentioned was only doing 7 IPM, even my mill is faster than
> that. Slow
> speed would be ok for a bit of a play, or if you're really
> patient. I
> wonder where their bottleneck was.
>
> Tony
>
>
>
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