thank you very much.
________________________________
Da: Kirk Wallace <kwall...@wallacecompany.com>
A: EMC developers <emc-developers@lists.sourceforge.net>
Inviato: Dom 31 ottobre 2010, 19:08:48
Oggetto: Re: [Emc-developers] (no subject)
On Sun, 2010-10-31 at 16:33 +0000, cristian pisoni wrote:
> hi,
> i'm going to build a cnc with my friends, i need to create the driver
> for the motors. do you know where i can find something that show the
> output signal of emc? ex: pin out and voltage of parallel port? thx
Drivers could be software or hardware. Do you need software to control
some hardware, or do you need the hardware that controls and powers the
motors?
Basically, EMC2 has two methods of interfacing with hardware, one being
the parallel port the other is a PCI card. The parallel port can
interface with your hardware directly using software signal generation
or talk to a card that generates signals from the card's hardware.
For parallel port software generated signals check out this:
http://www.linuxcnc.org/docview/html//hal_drivers.html
You can use this with step and direction motor drivers such as Gecko's:
http://www.geckodrive.com/
for stepper motors or DC motors.
Or you can generate quadrature or PWM signals to drive an H-bridge for
steppers or DC motors:
http://axis.unpy.net/index.cgi/etchcnc
http://emergent.unpythonic.net/projects/01142347802
The problem with parallel port software generated signals is that they
can be fairly slow, and with PWM, you usually need to compromise either
frequency or resolution.
Hardware signal generators are much faster and can interface to a PCI
slot or the parallel port. See:
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?EMC2_Supported_Hardware
What is most appropriate for your setup depends on the size of your
machine or rather axis speed, pitch and resolution. You might want to
check out machines that are similar to what you want and try to copy the
parts that apply:
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Case_Studies
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Videos
The start for most research should be here:
http://linuxcnc.org/
http://www.linuxcnc.org/content/view/5/5/lang,english/
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl
--
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
California, USA
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Nokia and AT&T present the 2010 Calling All Innovators-North America contest
Create new apps & games for the Nokia N8 for consumers in U.S. and Canada
$10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing
Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store
http://p.sf.net/sfu/nokia-dev2dev
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