Need help with cutter comp

I'm trying to mill a small slot approx 1/4 x 3/8" I get a error that it cannot find an intersection. Fanuc 0MC error 33 ( A point of
intersection cannot be determined for cutter comp C. Modify the program)
I'm not sure what size my resharp end mill will cut so I want to start with the full .125 comp and adjust from there.
I start above and Y-.2 offset a #7 drilled hole. machine works makes the Y move with comp, then does the -Z move then errors at N690.
Slot is too small to invoke comp in the hole. What do I need to fix. I would like to use CC more, but it always gives me trouble.
N400G0G17G20G40G80G90 N410(1/4" 3 FLUTE RESHARP END MILL) N420G0G91G40G80G28Y0Z0T5M6 N430G54D35 N440M01 N450G90G43Z1.H5M3S3500 N460/M8 N470G1Z.1F100. N650 G0 N660 X0.325 Y-0.7 N670 (SET D35 TO 0.125) N680 G1 G41 Y-0.5 F12.25 N665 Z-0.55 F5.5 N690 X0.203 Y-0.361 F12.25 N700 G3 Y-0.639 I0. J-0.139 N710 G1 X0.325 N720 G3 Y-0.361 I0. J0.139 N730 G1 X0.2062 N740 G1 Z0.1 N750 G40 X0.0
Thanks for any help.
Thank You, Randy
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Usually the Z plunge is before the G41

This move is giving the cutter comp problem

This move is not right either.

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
Try this:
N400G0G17G20G40G80G90 N410(1/4" 3 FLUTE RESHARP END MILL) N420G0G91G40G80G28Y0Z0T5M6 N430G54D35 N440M01 N650 G0 X0.325 Y-0.5 N450G90G43Z1.H5M3S3500 N460/M8 N470G1Z.1F100. N670 (SET D35 TO 0.125) N665 Z-0.55 F5.5 N680 G1 G41 Y-0.361 F12.25 N690 X0.203 N700 G3 Y-0.639 I0. J-0.139 N710 G1 X0.325 N720 G3 Y-0.361 I0. J0.139 N730 G1 X0.203 N750 G40 Y-0.5 N740 G1 Z0.1
Fred
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I programmed this job at home using a 3/16 end mill, I got several of those. they're new, so no comp needed.
I will try this tommorrow.
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On Wed, 21 Jan 2009 20:10:12 -0500, snipped-for-privacy@enter.net wrote:

Kind of defeats the purpose of learning to apply tool comp. Give the tool comp another try before you give up.
Tom
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Thanks Fred, it works. I thought I needed a bigger move to start comp, that's why I tryed to do it above the slot. The Y move you used was .139 so my comp of .125 worked.
Thank You, Randy
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wrote:

You're welcome, glad to help. Fred
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How did you know this was the problem? And why? Would it have given the problem at zero comp?
Is there a Prize in order, here??
--

Mr. PV'd

Mae West (yer fav Congressman) to the Gangster (yer fav Lobbyist):
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On Fri, 23 Jan 2009 10:09:55 -0500, "Proctologically Violated"

The line before it worked. error occurred on this line.
did not try comp 0.0. Would be a good test thou.....
Thank You, Randy
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Fadals don't give that error, and I don't know what intersection has to do with comp. Mebbe you didn't start far enough away for the initial g41 move, or it wasn't perpendicular enough?
It looks like yer milling an inside oval?
It would actually be easier to take the print dimension, and offset the straight lines by the tool radius, and let the arc be j+/-(print rad minus tool radius). Ackshooly perty simple once you get the knack. Even easier when you get the knack of variables.
g41 is a pita, and I avoid cc as much as possible.
But, if you have to use it, make sure it's g41 you need, and not g42.
Do you need to specify I0 if it's indeed zero? And then must it be I0. , ie, with the decimal? I think the fadal won't even load the program if I uses decimals with X0, etc.
--

Mr. PV'd

Mae West (yer fav Congressman) to the Gangster (yer fav Lobbyist):
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Usually you need some kind of a straight move to start comp so if as I understand you are milling a 0.25" slot with 0.25" cutter you will not be able to do that. Make your cutter 0.249" dia and give it say .0004" linear move when starting comp. Jerry

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SLOT IS .279 X .400
my g41 move is .2 in Y and that works. My comp number is the radius of the c utter .125 so my .2 move works for that. I was taught comp move must be bigger than your comp amount.
The next move is .122 in X. That seems to be the problem. If I set D35 to .100 all works good. Seems that next move is too short with comp on.
I think for this job anyway I'll bail out and use a 3/16 endmill programmed straight without comp.

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Sorry, I did not look at the code. Try this.
G0G17G20G40G80G90 (1/4" 3 FLUTE RESHARP END MILL) G0G91G40G80G28Y0Z0T5M6 G54D35 M01 G90G43Z1.H5M3S3500 M8 G1Z.1F100. G0 X0.325 Y-0.5 G1Z-0.55 F5.5 (SET D35 TO 0.125) G1 G41 Y-0.361 F12.25D35 X0.203 G3 Y-0.639 I0. J-0.139 G1 X0.325 G3 Y-0.361 I0. J0.139 G1G40 Z0.1X.325Y-.5 G40 X0.0
Jerry

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On Wed, 21 Jan 2009 18:44:00 -0500, snipped-for-privacy@enter.net wrote:

It's often easier to offset the profile 1/2 the mill diameter, and then cheat in the tool offset register. The machine won't argue if you tell it the endmill is .001
--

-JN-

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wrote:

cheat
And always use a slope when implementing, approaching at an angle either 90 degrees or higher never less that 90 deg you dont want any axis to have to reverse direction upon the next move cause "look ahead" cant look behind to see where cutter radius MIGHT have caused a gouge--personally too many errors get get generated NOT because the code is impossible to process just that too many do-gooders writing firmware that stops the processing and tosses an alarm because it MIGHT cause a problem, IMO legislate against fool's foolishness only if you want to become a nation full of fools.
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On Fri, 23 Jan 2009 12:41:17 -0500, "Proctologically Violated"

http://tinyurl.com/daykcx
May be more than JUST one nation.
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wrote:

No doubt.
Japanese TV hit rock bottom decades before ours did. They set the precedent.
re the smoking kid and his idiot moms: Methinks the Marlboro Man and Virginia Slims Woman have penetrated deeper into our skulls than we'd like -- in one way or another, be it ciggies or Swiffering.... goodgawd.... But that was lunacy. But proly more common than you'd think, along with weed and ackohol.
But, I must say, I'm attracted smoking wimins, esp those that sip warm beer.... don't know what it is, exactly....
Speaking of smoking women, a hilarious Moms Mabley joke, told by Whoopi on the ongoing PBS ditty on humuh....
Two women are walking along the street, one says, Hey, do you smell smoke? The other says, Hmmm, mebbe we shouldn't be walking so fast....
I'm not entirely sure I grok *all* the implications, but the few that I do grok are perty funny....
Next.....
--

Mr. PV'd

Mae West (yer fav Congressman) to the Gangster (yer fav Lobbyist):
  Click to see the full signature.
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Randy wrote:

Always, ALWAYS, the first thing to do with a cutter comp error is set the tool radius offset to zero, back off in Z, and run the program again. That will tell you immediately if the problem is in cutter comp, or if the tool path itself is wrong.
In this case, (without seeing the print) I'd guess that N690 and N700 won't work right, even without comp. You're moving at an angle, then doing a radius that starts at a quadrant (I is 0), instead of tangent to the angle. That might be right, but it looks fishy.
Also keep in mind that the machine is looking ahead when it's in cutter comp mode, and will normally stop before it actually gets to the block with an error. To find out where it's really choking, switch from Memory mode to Edit mode when the error occurs. The cursor will move from the block that's being executed to the one that the machine is thinking about. On a Fanuc OM, that's normally three or four blocks difference. The control is looking ahead, scouting for trouble, and will stop before it gets stuck in a box, backs into at too-tight corner, or whatever.
KG
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Randy wrote:

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