cutter comp alarm when using tool wear offset setting

[MACHINING JIM]

I hope someone can help me with this problem. I am running a program with about 50 identical pockets. I have been using a .125" endmill to shape them and have been finding the pockets gradually get smaller as I near completion. I have programed a tool change at about the half way mark so I can either change tools or adjust the wear offset. The trouble is I keep getting an alarm telling me that I have a cutter comp interference problem on the second pocket when running the finish pass. I am puzzled about this since I do not get an alarm on the first pocket only the second. Also Mastercam insnt giving me any Comp warnings. Has anyone encountered this before? I am sure its most likely something simple that I am overlooking.

 

Thanks for any help!

[Guest]

You are using Control comp, correct?

[Guyinthedesert]

Are you turning the comp off and then back on again from pocket to pocket? Some programmers try to turn the comp on at the beginning of the sequence, and off at the end. Alomst always creates problems.

[MACHINING JIM]

I am using the setting "wear" in the finish pass selection screen. I assume that the cutter comp is only applied to the finish pass and not the roughing cycle. I am finishing the pocket completly before moving on to the next pocket. Perhaps if I roughed all the pockets before finishing them I would have better results. I really dont want to do it that way though.

[Guest]

Have you checked the finish starting point on the second pocket to make sure it's not starting on a radius?

 

If so you may need to adjust it, you might try Start Finish pass at closest entity and see if that helps.

 

My guess is the starting point though

[Teh Bear without Brains kinda idiot]

I do not get an alarm on the first pocket only the second.

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Do you have g40 command before entering the second contour ?

[Oscar R.]

I've had this happen to me on the finish pass of a pocket.

Make sure you have your Leadin/Out is set with enough linier clearence to take up the comp that you're using on your tool. Alos if you don't have your Lead in/Out on at all and you're toolpath starts at an arc it will most likely alarm on your control.

[Goldorak]

I do not get an alarm on the first pocket only the second.

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Do you have g40 command before entering the second contour ?

 

 

x2, it looks like a post issue

[MACHINING JIM]

Have you checked the finish starting point on the second pocket to make sure it's not starting on a radius?

 

If so you may need to adjust it, you might try Start Finish pass at closest entity and see if that helps.

 

My guess is the starting point though

 

 

 

Identical start point identical geometry. Actually I got this alarm yesterday on a toolpath transform rotate. The first pocket machines fine as kind and alarms on the second.

[MACHINING JIM]

Thanks for the help. I will keep you posted when I solve this.

[MSL]

Thanks for the help. I will keep you posted when I solve this.

[MSL]

do you have your lead in and out on?

 

Ara.

[MACHINING JIM]

I Had some time to play around today and I ve seemed to have kinda solved some of my problem. In the tool wear offset page on my Haas I had a value of -.003" I set this to 0.0" and my alarm issue went away. There are some .0625" rads in this pocket so I am thinking that the machine thinks that the tool is too big to fit into these areas with the wear value applied. I am not 100 percent sure how the machine applies the wear offset. I didnt think that this would be an issue since the G code doesnt change. I had it in my head that everything would still machine as if the cutter was on still size even though it was offset the amount the tool was worn to compensate. Is there a way around this?