Hello Guest it is May 06, 2021, 10:07:50 PM

Author Topic: Cannot tune motor, Motor screen will not allow entering data  (Read 806 times)

0 Members and 1 Guest are viewing this topic.

Offline reuelt

*
  •  487 487
    • View Profile
Re: Cannot tune motor, Motor screen will not allow entering data
« Reply #10 on: April 10, 2019, 04:15:07 PM »
"I converted to ethernet and all stuttering is now gone"

EXPECTED if one understands the technologies.

ADVISE To all others 
Upgrade from MACH3+Parallel port to MACH4+Ethernet Motion Controller
Avoid ALL USB motion controllers.
"the gift of God is eternal life through Jesus Christ our Lord"
Re: Cannot tune motor, Motor screen will not allow entering data
« Reply #11 on: April 10, 2019, 07:05:34 PM »
Hi,
I too prefer Ethernet however PMDX have quite a history with their Mach4 capable smart BoB's, all USB connected
and without apparent difficulty.

I am less certain that one is better than another but rather the care with which each is implemented. USB seems to
be more sensitive to how it is enacted but PMDX have had a pretty good run with it.

Craig
My wife left with my best friend...
     and I miss him!

Offline reuelt

*
  •  487 487
    • View Profile
Re: Cannot tune motor, Motor screen will not allow entering data
« Reply #12 on: April 10, 2019, 07:25:31 PM »
Even PMDX is going ethenet with the  PMDX-426.

(Warp9) USS - USB obsolete - no plugin for MACH4
(CNCDRIVE) UC300 - USB version website says Obsolete - NO MORE IN PRODUCTION

Ethernet
or usb with troubles - will need USB Isolation Earth Device Device + Ferrite sleeves as BAND-AIDS.
"the gift of God is eternal life through Jesus Christ our Lord"
Re: Cannot tune motor, Motor screen will not allow entering data
« Reply #13 on: April 10, 2019, 07:40:47 PM »
Sorry, but the PMDX-426 project was put on hold because we found USB to work well.

USB is not quite as resistant to noise as Ethernet, but latency and speed are not
issues with Mach4. There can be issues if you plug in a large USB storage device
and Windows goes away while it caches directories, but this problem affects any
system, including Ethernet ones, because it is related to Windows behavior not to
the communications between Mach4 and the motion device.

All of our SmartBOBs employ common mode noise filtering on the USB port, and the
PMDX-424 (and other products being considered) employ electrical isolation to
break potential ground loops between the machine controller and the host PC.
For table top machines, and many larger machines things work well without
ground loop problems, but for industrial machines we do recommend using a
controller with isolation.

Twisted pair Ethernet (10BaseT) uses transformers for electrical isolation and
this prevents ground loops.

We chose to continue with USB because we feel that it works well for us and
because USB configuration is dead simple. Ethernet and IP addressing is normally
simple except when it isn't, then there is hell to pay in doing tech support for it.
« Last Edit: April 10, 2019, 07:43:27 PM by Steve Stallings »
Steve Stallings
www.PMDX.com
For PMDX product support, please use PMDX forum or direct email for quickest response. We do not use this forum as our primary product support site.
Re: Cannot tune motor, Motor screen will not allow entering data
« Reply #14 on: April 10, 2019, 07:58:41 PM »
Hi,
thanks for the clarification Steve. It supports my contention that USB when well enacted works fine
notwithstanding its somewhat weaker specs.

I think the reason that USB has gotten a tarnished reputation is because a lot of manufacturers have made cheap
USB solutions and those have been problematic. This is more about poor design/build quality than it is about
the limitations or otherwise of USB.

Craig
My wife left with my best friend...
     and I miss him!

Offline reuelt

*
  •  487 487
    • View Profile
Re: Cannot tune motor, Motor screen will not allow entering data
« Reply #15 on: April 10, 2019, 10:21:09 PM »
Sorry, but the PMDX-426 project was put on hold because we found USB to work well.

My apologies.
Attached picture is example of USB ground loop isolation devise. Requires external 5V PSU.


"the gift of God is eternal life through Jesus Christ our Lord"