Hello Guest it is December 06, 2019, 08:02:14 AM

Author Topic: no movement on y axis  (Read 4352 times)

0 Members and 1 Guest are viewing this topic.

Offline aahka

*
  •  15 15
    • View Profile
no movement on y axis
« on: November 20, 2013, 09:34:00 AM »
This is my first attempt to start a new thread on this website.  Please excuse my blundering if this a mistake.
I have been using a gecko G540 on a CNC router for over a year. We recently changed the table from a 4' x 4' to a 5' x 10' table. Then we started to experience recurring faults and E-stop reset messages on Mach3. Now we get a reset message occasionally when we move the Y axis. The X and Z axes work fine. The G540 red fault light comes on and the power green light goes off when movement  stops along the Y axis as the result of an e-stop. We also experience an unusual phenomenon during a rapids command.  When executing the following:
G00X10.8125Y78.5000Z0.2000
The router moves the correct distance along the x axis, but makes no movement along the y axis.  The router also seems to drop at a slow rate along the z axis while moving in along the x axis.
We eliminated the limit switches as the problem by shorting them out during a trial run with no perceptible performance change.
Please provide any troubleshooting advice you can.

Offline Hood

*
  •  25,856 25,856
  • Carnoustie, Scotland
    • View Profile
Re: no movement on y axis
« Reply #1 on: November 20, 2013, 04:30:35 PM »
Quote
When executing the following:
G00X10.8125Y78.5000Z0.2000
The router moves the correct distance along the x axis, but makes no movement along the y axis.  The router also seems to drop at a slow rate along the z axis while moving in along the x axis.

It will all depend on your start position, for example if the Y is already at that point it will not move, if the Z is higher then it will lower.

Quote
We eliminated the limit switches as the problem by shorting them out during a trial run with no perceptible performance change.
Instead of shorting out the limit switches disable them in Mach. If they are shorted then noise could still be entering the system, if you disable them then Mach will not be looking at them at all so noise will be ignored. If disabling them helps then you need to cure the noise by shielding and properly grounding , possibly using a capacitor or as a last resort entering a Debounce Interval in General Config page.

Hood

Offline aahka

*
  •  15 15
    • View Profile
Re: no movement on y axis
« Reply #2 on: November 21, 2013, 06:48:24 PM »
These are the preliminary lines of g-code in my program. When I reach line N200, the router is at the N190 coordinates of 0,0.
The router moves along the diagonal toward x10.8125y78.000 till Y=3.00 then all movement in the Y direction ceases and the router continues to move in the X direction to 10.8125
however, the DRO and toolpath on the Mach3 screen continues along the diagonal to Y=78.000.
I just seems like the stepper signal to the y motor & A slave motor ceases at about 3. This number will vary when the program is rerun between 10 & 11.
( CF-BM PROFILE X1 )
( File created: Thursday, November 14, 2013 - 10:41 PM)
( for Mach2/3 from Vectric )
( Material Size)
( X= 12.000, Y= 80.000, Z= 0.750)
()
(Toolpaths used in this file:)
(Profile 1)
(Tools used in this file: )
(1 = End Mill {0.25 inch})
N100G00G20G17G90G40G49G80
N110G70G91.1
N120T1M06
N130 (End Mill {0.25 inch})
N140G00G43Z0.8000H1
N150S20000M03
N160(Toolpath:- Profile 1)
N170()
N180G94
N190X0.0000Y0.0000F50.0
N200G00X10.8125Y78.5000Z0.2000
N210G1Z-0.3800F30.0
N220G1Y1.5000F50.0
N230G2X10.6875Y1.3750I-0.1250J0.0000
N240G1X8.3125
I appreciate your initial response. What do you think with this additional info?
I returned the limit switches to their original setup.  The shorting them out was just a short term test to see if the problem was in the limit switch circuitry.
Jack (aahka)

Offline Hood

*
  •  25,856 25,856
  • Carnoustie, Scotland
    • View Profile
Re: no movement on y axis
« Reply #3 on: November 22, 2013, 03:26:33 AM »
Ok that is  a G0 move, it is possible your axis is stalling. Try reducing the Accel and Velocity (for Y at least) by 50% and see if it helps, if not attach your xml.

Hood

Offline aahka

*
  •  15 15
    • View Profile
Re: no movement on y axis
« Reply #4 on: November 23, 2013, 04:20:28 PM »
I had previously reduced the acceleration, to no avail. I went into my shop and copied the xml file to a flash drive. There are numerous pages of text. How do I send it to you? Is there an email address so I can send it as an attachment? Is there a way to attach it to a post?

Offline Hood

*
  •  25,856 25,856
  • Carnoustie, Scotland
    • View Profile
Re: no movement on y axis
« Reply #5 on: November 23, 2013, 04:57:51 PM »
You can attach the xml by using the additional options button on the reply page. You will have to make the name unique as the forum will only accept a file name once, so copy the xml to your desktop and rename it to aahka1.xml and attach.
Hood

Offline aahka

*
  •  15 15
    • View Profile
Re: no movement on y axis
« Reply #6 on: November 23, 2013, 05:32:12 PM »
xml file is attached. Hope this works.

Offline Hood

*
  •  25,856 25,856
  • Carnoustie, Scotland
    • View Profile
Re: no movement on y axis
« Reply #7 on: November 23, 2013, 05:47:34 PM »
Dont see too much wrong with the xml at first glance but please try again reducing the accel and velocity by 50% and see. That is the most common issue with steppers, they stall because they are just on the limit of working.
Also have you run the driver test to see what it looks like?
Hood

Offline aahka

*
  •  15 15
    • View Profile
Re: no movement on y axis
« Reply #8 on: November 23, 2013, 07:36:12 PM »
Thanks. I'll try that when I go into my shop on Monday. I had also talked to a teck guy at Gekko who recommended the reduction in acceleration (my earlier reduction from 100 to 25 on all axis's).  He also said that if that didn't work, try to place a 10,000 microfarad condenser in parallel with my 48 volt power supply.  That condenser is on order.  Do you think that will help?
aahka

Offline Hood

*
  •  25,856 25,856
  • Carnoustie, Scotland
    • View Profile
Re: no movement on y axis
« Reply #9 on: November 24, 2013, 03:11:56 AM »
It depends on your power supply, if it is a basic transformer with a rectifier then you definitely require a capacitor to smooth the rectified AC.

Hood