Stepper motors are still going at the wrong speed........
Posted by
apples0_17
on 2005-12-23 04:59:23 UTC
Ihave this system on a plasma table.
Cut area 3m x 2m
Geckodrive G202's
48Volt 13amp power supply
Running two 1200oz-in steppers on the x
axis.
And one 270oz-in stepper for the y axis.
Using CorelDRAW, AutoCAD, SheetCAM and
Mach3.
The motors are all tuned up right. They
have the correct steps per unit etc.
--------------------------------------------
----------
The problem:
If the velocity is set to 10,000mm/min in
the 'motor tuning' page for both the x and y
axis. And I go and jog the gantry in the y
axis it will move along at the correct speed
of 10,000mm/min. This will be shown in the
DRO.
But, if I jog with the x axis the motors
will move at 14,000mm/min instead of the
10,000mm/min that was setup in the 'motor
tuning' page.
This problem will also happen if I run a
g-code through Mach3. Say for example I run
a square shape. The feed speed will be set
on 5000mm/min. The y axis will feed
correctly at the set 5000mm/min. The x axis
will move faster than the set speed that it
is meant to. It will move at 7000mm/min
instead of the 5000mm/min required.
I have checked that the speeds that the DRO
are reading are correct.
How I done this was, Made the machine run
for a distance of 1meter and counted how
long it would take to travel the 1meter.
From those results it showed that the DRO
are giving me correct readings.
I have alos cut out a part in 10mm steel
with the plasma. You can see how the edges
are smooth and perfect, then the gantry
makes a right turn and the x axis starts
driving. The x axis moves faster than the y
axis and therefore the cut edge is very
poor.
I am only a newbie to this so I have tried
everything that I can think of.
I wiped all traces of Mach 3 then reloaded
Mach3 again. Making sure to re-boot after
the instalation.
So I am stumped as to what is going on.
Can anyone help?
P.s on the gecko's I adjusted a 'trimpot'
which is the 'low speed vibration' trimpot
screw. Maybe this has effected the motors
etc...
I adjusted the screw at the back of the
Gecko untill the vibration in my machine
went away.
Peter
Australia
Cut area 3m x 2m
Geckodrive G202's
48Volt 13amp power supply
Running two 1200oz-in steppers on the x
axis.
And one 270oz-in stepper for the y axis.
Using CorelDRAW, AutoCAD, SheetCAM and
Mach3.
The motors are all tuned up right. They
have the correct steps per unit etc.
--------------------------------------------
----------
The problem:
If the velocity is set to 10,000mm/min in
the 'motor tuning' page for both the x and y
axis. And I go and jog the gantry in the y
axis it will move along at the correct speed
of 10,000mm/min. This will be shown in the
DRO.
But, if I jog with the x axis the motors
will move at 14,000mm/min instead of the
10,000mm/min that was setup in the 'motor
tuning' page.
This problem will also happen if I run a
g-code through Mach3. Say for example I run
a square shape. The feed speed will be set
on 5000mm/min. The y axis will feed
correctly at the set 5000mm/min. The x axis
will move faster than the set speed that it
is meant to. It will move at 7000mm/min
instead of the 5000mm/min required.
I have checked that the speeds that the DRO
are reading are correct.
How I done this was, Made the machine run
for a distance of 1meter and counted how
long it would take to travel the 1meter.
From those results it showed that the DRO
are giving me correct readings.
I have alos cut out a part in 10mm steel
with the plasma. You can see how the edges
are smooth and perfect, then the gantry
makes a right turn and the x axis starts
driving. The x axis moves faster than the y
axis and therefore the cut edge is very
poor.
I am only a newbie to this so I have tried
everything that I can think of.
I wiped all traces of Mach 3 then reloaded
Mach3 again. Making sure to re-boot after
the instalation.
So I am stumped as to what is going on.
Can anyone help?
P.s on the gecko's I adjusted a 'trimpot'
which is the 'low speed vibration' trimpot
screw. Maybe this has effected the motors
etc...
I adjusted the screw at the back of the
Gecko untill the vibration in my machine
went away.
Peter
Australia