Spindle losing location mid run

[kenthba]

Hi everyone, I'm having a problem with my axiom cnc and I was wondering if you knew what was going on. I made this sign and was trying to run the program and about 7 minutes in or so in while the spindle is moving from the word "the" to the word "turners" the CNC makes a weird noise and appears to lose its location because after that everything is off where it should be. I ran the program again and it did the exact same thing in the exact same location so I was hoping you could take a look at this crv file and help me find out what's going on.



Thank you

Attachments:

lastnameest.crv (2.59 MB)

[Bob]

It sounds like you are losing steps.
Does the machine go to the home position when you turn on your machine?
Do you re-home the machine whenever you start the cnc for the first time of the day?
Are there any tools, or materials on or under the machine that could interfere with movement?
You're hitting something causing the motors to make a grinding noise...then you lose steps and the origin location is lost.
Are the drive screws clean and lubricated?
What's the maximum width your table can handle along the X axis? Your sign is at those limits if it's 24" You will ordinarily get a warning if you're going to cut outside of those limits. That's why I'm curious about your homing procedure. The limit switches may be setup wrong. Or they might have moved.
Bob

[grossmsj]

I don't see anything wrong with the CRV file, or the simulation of the file. But I noticed its a pretty long cut. My suspicion is that there is some sort of data corruption along the way. Here are a few things to check.
1) When you are writing these files to your USB drive be sure to wait until the files are completely written to disk. It shouldn't take very long, but if you have a wonky old USB drive there could be slow writing there.
2) I've attached two .mmg files that I wrote to my hard drive from your CRV. Compare the file size of these against the file size of your .mmg files. If yours are shorter it would point to corruption.
3) You might want to write the .mmg files from your USB drive to the pendant and cut the work from Axioms internal storage versus from the USB drive. It would be odd to have it crash in the exact some place if there was bad data transfer, but you never know.

Attachments:

letter cutout Clear_1-letter cutout Clear.mmg (408.25 KB)

letter cutout Clear_2-letter cutout.mmg (707.7 KB)

[kenthba]

Hi Grossmsj, They are the exact same size.

[kenthba]

Hi Bob,

1. No, the cnc asks if I would like to home all axis's to the home position
2. Yes I always home the position before I start
3. I keep a chisel and a magnet on the side of the machine but it is out of the way.
4. I've never lubricated the drive screws. I've only ran the machine a few times but it is used. The previous owner said that he did do maintenance to the machine.
5. I believe the maximum width it can handle is 24".
I will work on the lubrication and drive screws.

[Bob]

And, check the X axis limit switch location. It may be out of position.