Hello Tom,

I have a KFlop/SnapAmp machine which is acting a little weird. There are 2 servo motors (X/Y axis) and 2 stepper motors (Z/A axis) and each group runs from a different SnapAmp. Occasionally the A axis stops physically moving while the readout keeps going.

The steppers are open loop, so I checked for jamming of the slide and loose couplings, but both were good. The funny thing is the screen jog buttons always move the A axis no problem, but when the motion is within gcode, it often will not move. A reboot of the system will usually restore normal movement temporarily.

Any thoughts on what may be causing this?

Thanks,
David.

Hi David,

GCode G1,G2,G3 commands use different Velocity, Acceleration, and unlimited Jerk compared to Jogging and Rapids.

See:
http://www.dynomotion.com/wiki/index.php?title=Main_Page#Velocity.2C_Acceleration.2C_and_Jerk


Regards
TK

On 2016-02-20 12:34, david.m.stevenson@... [DynoMotion] wrote:
 > Hello Tom,
> 
> I have a KFlop/SnapAmp machine which is acting a little weird. There
> are 2 servo motors (X/Y axis) and 2 stepper motors (Z/A axis) and each
> group runs from a different SnapAmp. Occasionally the A axis stops
> physically moving while the readout keeps going.
> 
> The steppers are open loop, so I checked for jamming of the slide and
> loose couplings, but both were good. The funny thing is the screen jog
> buttons always move the A axis no problem, but when the motion is
> within gcode, it often will not move. A reboot of the system will
> usually restore normal movement temporarily.
> 
> Any thoughts on what may be causing this?
> 
> Thanks,
> David.
> 

 

Hi Tom,

I understand there are different settings for the 2 movements, I don't understand why one of the methods would stop working. Is this likely a problem with a SnapAmp? A G0 or G1 don't work, but there is power and signal for the other method.

Thanks,
David.

 

Hi David,

GCode G1,G2,G3 commands use different Velocity, Acceleration, and unlimited Jerk compared to Jogging and Rapids.

See:
http://www.dynomotion.com/wiki/index.php?title=Main_Page#Velocity.2C_Acceleration.2C_and_Jerk


Regards
TK

On 2016-02-20 12:34, david.m.stevenson@... [DynoMotion] wrote:
> Hello Tom,
> 
> I have a KFlop/SnapAmp machine which is acting a little weird. There
> are 2 servo motors (X/Y axis) and 2 stepper motors (Z/A axis) and each
> group runs from a different SnapAmp. Occasionally the A axis stops
> physically moving while the readout keeps going.
> 
> The steppers are open loop, so I checked for jamming of the slide and
> loose couplings, but both were good. The funny thing is the screen jog
> buttons always move the A axis no problem, but when the motion is
> within gcode, it often will not move. A reboot of the system will
> usually restore normal movement temporarily.
> 
> Any thoughts on what may be causing this?
> 
> Thanks,
> David.
> 

This email has been sent from a virus-free computer protected by Avast. www.avast.com

Hi Tom,

I guess there is something obvious here, but it escapes me. Any other clues of things I should do or check?

Thanks,
David.

 

Hi David,

GCode G1,G2,G3 commands use different Velocity, Acceleration, and unlimited Jerk compared to Jogging and Rapids.

See:
http://www.dynomotion.com/wiki/index.php?title=Main_Page#Velocity.2C_Acceleration.2C_and_Jerk


Regards
TK

On 2016-02-20 12:34, david.m.stevenson@... [DynoMotion] wrote:
> Hello Tom,
> 
> I have a KFlop/SnapAmp machine which is acting a little weird. There
> are 2 servo motors (X/Y axis) and 2 stepper motors (Z/A axis) and each
> group runs from a different SnapAmp. Occasionally the A axis stops
> physically moving while the readout keeps going.
> 
> The steppers are open loop, so I checked for jamming of the slide and
> loose couplings, but both were good. The funny thing is the screen jog
> buttons always move the A axis no problem, but when the motion is
> within gcode, it often will not move. A reboot of the system will
> usually restore normal movement temporarily.
> 
> Any thoughts on what may be causing this?
> 
> Thanks,
> David.
> 

This email has been sent from a virus-free computer protected by Avast. www.avast.com

Hi David,

You might check if the A Axis is still defined in the System at the time it isn't moving from GCode by entering "DefineCS".

Does the A motor have holding torque?

Does it just vibrate rather than moving?

What does the KMotion Analog Screen show regarding the SnapAmp Supply voltages and Motor currents?

Have you tried a very slow feed rate?

Is the Peak Current Fault LED on SnapAmp come on?

What are your settings?

Regards
TK

 

Hi Tom,

I guess there is something obvious here, but it escapes me. Any other clues of things I should do or check?

Thanks,
David.

On 2/20/2016 1:06 PM, tk@... [DynoMotion] wrote:

 

Hi David,

GCode G1,G2,G3 commands use different Velocity, Acceleration, and unlimited Jerk compared to Jogging and Rapids.

See:
http://www.dynomotion.com/wiki/index.php?title=Main_Page#Velocity.2C_Acceleration.2C_and_Jerk


Regards
TK

On 2016-02-20 12:34, david.m.stevenson@... [DynoMotion] wrote:
> Hello Tom,
> 
> I have a KFlop/SnapAmp machine which is acting a little weird. There
> are 2 servo motors (X/Y axis) and 2 stepper motors (Z/A axis) and each
> group runs from a different SnapAmp. Occasionally the A axis stops
> physically moving while the readout keeps going.
> 
> The steppers are open loop, so I checked for jamming of the slide and
> loose couplings, but both were good. The funny thing is the screen jog
> buttons always move the A axis no problem, but when the motion is
> within gcode, it often will not move. A reboot of the system will
> usually restore normal movement temporarily.
> 
> Any thoughts on what may be causing this?
> 
> Thanks,
> David.
> 

This email has been sent from a virus-free computer protected by Avast. www.avast.com