Hi John,
I am surprised that you are still talking about Mach3. I thought that
Mach3 was suppose to be obsoleted by now
and replaced by Mach4. What happened? I've been out of the Mach3 loop
for a while.
Dave
On 10/10/2017 1:23 PM, John Dammeyer wrote:
I have a MPG on my ELS for the lathe and a ShuttleExpress for the MACH3 on
the CNC router. I too wouldn't be without some sort of MPG. Response time
on the 40MHz PIC is instant. I also find the ShuttlePro and keyboard
buttons response for jogging essentially instant on MACH3.
Jogging MachineKit on the BBB is a joke with the path screen displayed. I
don't think it should be so I'll bring this up on the MachineKit for Beagle
forum. There's probably a parameter somewhere that fixes it. A single step
button click for 0.01 move shoots the processor activity up to 100%
OTOH, go to the DRO screen (no tool path) and the keyboard feels like it's
attached to the stepper with instant jogging more like a 1.16GHz Athlon PC
1GB RAM that is displaying tool path. Beagle Processor Activity bar drops
to 50% or less.
If I were to draw a conclusion I'd say the overhead of screen updating is a
killer for the Beagle MachineKit. I read that AXIS is written in Python.
An pseudo real time application I did a few months ago using Python on a Pi3
was quickly moved to C after we found the interpreted Python just couldn't
keep up. But again, I don't know what's happening under the covers.
John
-----Original Message-----
From: Jon Elson [mailto:el...@pico-systems.com]
Sent: October-10-17 9:13 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] MachineKit on the BeagleBone Black
On 10/09/2017 09:00 PM, Frederic RIBLE wrote:
On 2017-10-10 00:02, Sebastian Kuzminsky wrote:
I don't know about machinekit, but in linuxcnc
incremental jogs are safer than continuous jogs in high
latency situations like these.
Same behavior with machinekit.
This is one of the motivations I have for adding physical
jog wheels on my machines.
Boy, I'll tell you, once I put a jog dial on my mill, I
would NEVER want to be without it! We have this hideous
Levil thing at work, and you are stuck with a finger pad on
a laptop, and it goes and jogs without command all the time!
I machine to top to clean up a face of a part all the time
with the jog keys on my mill, but step down the Z with the
jog dial. I can count out the clicks on the dial without
looking. Very nice.
Jon
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