Re: [CAD_CAM_EDM_DRO] reprap build started

Alan wrote:

> Kevin, Mike,
>
> What's the basic relationship of feeding stock to the travel in X &Y?
>
> Sounds like it would be a direct relationship. So one could calculate a
> "feed distance" for the stock, and assign it to another axis to drive the
> extruder (scaled, of course)...
>
> Seems like if the X axis needed to move 5" to lay down the filament, then 5"
> of stock (or some scale of that) would need to be extruded at the same time.
> Just like a "coordinated move"! Has someone already thought of that?
>
> I could see a little program that took normal Gcode, and generated the
> "pseudo axis" for the coordinated move.
>

Since the filament fabricator has no Z axis, just a layer step size, one
could assign the
extruder drive to another axis, like Z (or U). Then, the G-code could
be written to
always move Z scaled by the sqrt(x*2 + Y*2) movement. This would give
an acceleration
ramp on the extruder that matches the acceleration of the X-Y table.
The only thing this
lacks is the pull-back each time the extruder needs to stop. That could
also be written
into the code.

So, this could ALL be done in G-code, although it might end up being a
LOT of lines.

Jon