I've done it using analog interfaces and a step and direction
interfaces. Both methods work.
The nice thing about analog is that you can measure and monitor
following error within LinuxCNC and easily tune the position loop. With
a digital step and direction interface the position loop is maintained
in the drives which is ok if your drives do a good job of maintaining
position control. Most smart drives have some tuning software to setup
the drives. Some of the software is pretty good, and some of it is
really marginal.
I believe that Tormach uses a step and direction drive interface for all
of their machines.
On 8/10/2017 1:56 PM, Todd Zuercher wrote:
This is almost a religious question, and many may avoid offering their own
personal opinion.
My vote is for analog. But in truth both can work equally well, and each have
advantages and disadvantages.
Digital positioning, may be cheaper to implement, if the cost of "smart" servo
drives is not in the equation.
----- Original Message -----
From: "Marius Liebenberg" <mar...@mastercut.co.za>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Sent: Thursday, August 10, 2017 6:09:35 AM
Subject: [Emc-users] Servo - Velocity or Position mode
Hi
I have to upgrade and convert an old machine that was used to cut with
gas. It uses some Panasonic MCDHT3520 servo drives.
These drives has a pulsed input for position and an analog +- 10v input
for velocity mode.
The question is what mode is better to use with LCNC and Mesa cards,
velocity or position?
I will use one of the Ethernet solutions from Mesa with a panel PC.
-----------------------------
Regards / Groete
Marius D. Liebenberg
+27 82 698 3251
+27 12 743 6064
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