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Author Topic: Stepper motors are still going at the incorrect speed. Need help with Mach3  (Read 6313 times)

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I have 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.

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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 theDRO.

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
Re: Stepper motors are still going at the incorrect speed. Need help with Mach
« Reply #1 on: December 23, 2005, 01:00:59 PM »
Peter,
could you post the gcode you are running to cut the square?
Regards
Fernando
Fernando,

I will post some G-code for this square in a few days.  We are off for about 4-5 days to see all the relatives etc.

I will just copy the .tap file that SheetCAM makes for the square.  Is this okay, and what you mean.

Where should i post it to?  Will it post straight to this topic page.

Peter
Fernando,

Here is the g code.

I ran this on another computer, a laptop.  The laptop is in the house and is the internet computer.  The one in the shed is a proper desktop computer dedicated for the cnc stuff,  no games etc.

When I ran this g-code on the laptop, all the feeds came out right.  x and y axis both traveled at 1300mm/min like they should.

Someone also sugested to me to make sure that the correct 'jumpers' are set on the Geckodrives.


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N0000 (Filename: square.tap)
N0010 (Post processor: Plasma1.post)
N0020 (Date: 18/12/2005)
N0030 G21 (Units: Metric)
N0040 G53 G90 G40
N0050 F1
N0060 S500
N0070 (Part: square)
N0080 M06 T1 F1300  (Plasma, 2.5 mm kerf)
N0090 (Process: Plasma,  0, Plasma, 2.5 mm kerf)
N0100 G00 Z12.7000
N0110 X125.3229 Y210.4756
N0120 Z3.0000
N0130 M03
N0140 G04 P1
N0150 G01 Z1.5000 F2540
N0160 X200.3229 F1300
N0170 Y135.4756
N0180 X125.3229
N0190 Y210.4756
N0200 X120.3229
N0210 M05
N0220 G04 P5
N0230 G00 Z12.7000
N0240 M05 M30


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Cheers,

Peter
(Australia)
Re: Stepper motors are still going at the incorrect speed. Need help with Mach
« Reply #4 on: December 23, 2005, 06:42:31 PM »
Well the code looks good...  Could you send me your XML?
If you can send me your XML I will go over it and see if there is a problem.

Fixing problems one post at a time ;)

www.newfangledsolutions.com
www.machsupport.com
How or where do I find my XML ????

Peter

Re: Stepper motors are still going at the incorrect speed. Need help with Mach
« Reply #6 on: December 24, 2005, 01:52:59 AM »
Yes, g-code looks fine.
Probably some problem on you xml, or on the instalation.
you can find the xml on the following directory
C:\mach3\
There are files for each profile with the xml extension, for example mach3mill.xml

Regards
Fernando
Re: Stepper motors are still going at the incorrect speed. Need help with Mach
« Reply #7 on: December 26, 2005, 08:13:08 AM »
Sorry I just got back in... You are going to need the Mach3Mill.xml file in the Mach3 directory.

Thank you and have a great day
Fixing problems one post at a time ;)

www.newfangledsolutions.com
www.machsupport.com