Re: [CAD_CAM_EDM_DRO] Maybe OT, reprap build started

Kevin,

You should really consider upgrading your electronics. I personally prefer
RAMPS, which has greater expansion capability than the other good choice of
the Sanguinololu.

You can order the RAMPS board at http://www.lulzbot.com/en/4-electronics.
Any of the three versions are fine, V1.3 adds an additional stepper driver
port for a possible second extruder, but otherwise 1.2 and 1.3 are similar.
1.4 cleans up the board a bit and switched several components to SMT parts
to do so.

In addition to the RAMPS board, you will need an Arduino Mega, which can be
purchased easily from ebay for about $35 delivered. and you will need 4
Pololu stepper drivers, which lulzbot sells for $17 each, or Pololu sells
for $13 each (though with the extra shipping lulzbot may be cheaper).

On Sat, Oct 8, 2011 at 6:42 AM, Kevin Martin <kpmartin@...> wrote:

> Our extruder is described at
> http://reprap.org/wiki/Wade%27s_Geared_Extruder which is actually one of
> the better-documented parts of the printer.
> The electronics are described at
> http://reprap.org/wiki/Generation_3_Electronics/Tech_Zone_Remix
> The individual boards are described in pages linked to from
> http://reprap.org/wiki/Generation_3_Electronics, for instance our extruder
> controller 2.2 is described at
> http://reprap.org/wiki/Extruder_Controller_2.2
> The firmware is described at http://reprap.org/wiki/Generation3Firmware.
>
> That being said, all the stuff we have is at least a year old, and
> verifying that the above documents (which may refer to more up-to-date
> stuff) are still relevant to us is difficult. For example I thought we has
> the )optional) Thermocouple Sensor 1.0 (
> http://reprap.org/wiki/Thermocouple_Sensor_1.0) but it turns out that our
> thermocouple sensor uses a different chip, one designed for monitoring NiMH
> battery charging. The board circuit is different but the board interconnect
> is the same. A firmware change accounts for the difference in the data
> generated by the two thermocouple controllers.
>
> Calibration (or lack thereof) is one of my major complaints about the whole
> field. There are calibration/tuning parameters wired into the source code,
> so to adjust them you have to load new firmware. Which requires building new
> firmware. Which requires being absolutely sure you start with the correct
> source code for the firmware you already have.
>
> Has anyone make up some tables for ...? Probably yes. Can you find their
> results? Maybe. Can you be sure their results are applicable to your own
> setup? Thanks to the versioning mess, probably not.
>
> -Kevin Martin
> the Papertrail Handmade Paper & Book Arts
> New Dundee, Ontario
> 518-884-7123
> www.papertrail.ca
>
> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com [mailto:
> CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Phil@Yahoo
>
> Glad to hear that. So can you share some URLs? I'm not talking about
> drawings for bits of plastic, but about PCB schematics and microprocessor
> source code for things like temperature controllers. Also I'm wondering how
> to calibrate the extrusion speed to the head motion speed. Has anyone made
> up some tables correlating filament size with temperature and extrusion
> speed and nozzle size and head travel speed? That's where the important
> knowledge is if you don't want to re-invent the wheel. Moving things in
> X-Y-Z is the easy part.
>
>
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