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Old 06-27-2010, 06:31 PM   #1 (permalink)
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What would cause this

This was the only spot in a run of 8 parts that had this rough edge. This was one of 2 identical parts and the other one came out smooth, so I know the drawing was right. I thought possible "dirty" air but the rest of the run was fine (6min program) so I figured it would have happened more times if that was the case. Any idears?

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Old 06-27-2010, 10:54 PM   #2 (permalink)
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What ever it is, it is consistant/uniform, leads me to think it is an electrical/program problem, seems too regular to be mechanical.
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Old 06-28-2010, 12:35 AM   #3 (permalink)
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Do your slats shake/sway at all? I've had the same thing happen before when the table shakes, or rocks back and forth. After a hard switch in directions the part wobbles momentarily. I don't have the issue when cutting from large parts but when using small peices or scrap(smaller than 12x12, and light weight) it happens easier. I usually throw some weights (scrap) on the edge of small peices to help keep them steady.
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Old 06-28-2010, 03:20 AM   #4 (permalink)
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It was a scrap piece of 3/8s, roughly 10x15. The slats do shake from time to time so that may be it.
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Old 06-28-2010, 06:51 AM   #5 (permalink)
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If you had more than one part with this issue.....on the same location and in the same direction....then slat shake is likely. A slug of moisture in the air can do something similar....but would be random.

Jim
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Old 06-28-2010, 07:22 AM   #6 (permalink)
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This was the only piece out of the run that had the ripples. Possibly water but idoubt it, I cleared the 3 filters before the run. I'm guessing it was the soars but it strange it didn't shake when it cut the second piece like this one
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Old 06-28-2010, 07:57 AM   #7 (permalink)
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Looking at how the ripples suddenly stop rather than fade to a smooth cut I would look more at something being caught then releasing.

Say for example the torch lead was stuck on the edge of the table. The motors struggle to pull it and you get the ripples; once the torch releases from the snag it runs smooth.

This is not to say that a wobble in the slats could have caused the problem but it may not be the only reason something like this can be caused.

-Jack
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Old 06-28-2010, 08:45 AM   #8 (permalink)
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Seems like a relay or valve that controls the air is fluttering, opening a little more air then it should have then stabilizing, if such a thing is possible?
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Old 06-28-2010, 04:02 PM   #9 (permalink)
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Were your bearings rolling free?
Where was the pierce point?
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Old 06-28-2010, 04:23 PM   #10 (permalink)
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Quote:
Originally Posted by bullydogcj View Post
Were your bearings rolling free?
Where was the pierce point?
The bearings were not free, I had an issue with that a little while back and that was the first thing I checked. The pierce was at the corner of the arc that would be on the left side of the pic.
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Old 06-28-2010, 04:38 PM   #11 (permalink)
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A cut deviation that large should be noticeable while watching the program run. I would run the same program in a dry run to see if you can tell what's happening at that point in the program.
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Old 07-05-2010, 11:24 AM   #12 (permalink)
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i have seen that before with my setup. i noticed that when ever it did it, it was caused by a slag ball that attaches to the tip when your cutting. i only see it when im trying to cut to close
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