Fanning

[Joeyls319]

Good afternoon folks,

I'm trying to figure something out and I'm having some difficulty with it. I was wondering what fanning is and what does it do for you exactly . Any kind of help would be greatly appreciated.

 

Thanks in advance.

 

Joey

[crazy^millman]

Which operation do you want to use this in and for what machine do you want and for what tool do you want for what part do you want. A smaple file will really be cool also.

[chris m]

Assuming that you're talking about what I think you are, 'fanning' a part is typically chipping both ends to just clean them up

 

This is typically done with torched or sawed plates or a die set to establish a known centerline from which to work. Usually done in stamping dies, maybe elsewhere...

 

Is this what you meant?

 

C

[Joeyls319]

Millman,

Thanks for the quick response. I'm trying to swarf around an angled surface with a 1/2 endmill on a Haas TR-6. My problem is the swarf works pretty good until the tool reaches the radiused part of the surface. When the machine starts to rotate the cutter digs into the part. It's only at the start of those points. I'm not sure if this is the best way to do this oper. but it's the only way I could get it to work. I thought maybe fanning had something to with it. I could probably e-mail you the part if you want. I can't get on the FTP site.

 

Joey

[Joeyls319]

Chris,

after I read what you said it sounds like fanning is not my problem. Now I'm not quite sure how to fix my problem. If you read the post to millman you could see my dilema. Any suggestions.

 

Thanks

Joey

[crazy^millman]

Well here you need to do this little different I have found that Mastercam doesw better use Sync method for this type of a toolpath. I would go into another level and create a equal number of points on the top and the bottom chains.(need to keep these reasonalbe or it becomes a pain) I would then use the same tool path but tell it sync instead of chain and then make sure it says points. I have found it keeps the tool correct to the surface better this way than just chains alone.

[Joeyls319]

Thanks Millman,

I'll it a try and let you know.

 

Joey

[crazy^millman]

One thing if that doesn't help does your post need a povit distance and if so when is the last time you checked this.

[chris m]

Seems like I didn't know what you were saying after all.

 

Sounds like Ron is on the case; since I know zippo about Surface Machining I'll bow out of this thread.

 

Good Luck

 

C

[crazy^millman]

Well actullay Chris it is 5 axis swarf. I had the same problem about 2 years ago and my dealer was the one who pointed me in the right direction. One other thing about this toolpath you can depth of cuts and it works very nice.

[Joeyls319]

Millman,

I tryed the point thing and it looked good on the screen but when I posted it I can see in the code that the machine will rotate back a little and the tool is digging in at that point. I just read your last post. I never heard of "povit distance" in the post. How do I check it and is it easy to correct.

 

Thanks

Joey

[crazy^millman]

Hum I am going to have to pass that off to your dealer. It is not that I don't want to help you but I would need to know so much to help you that It would take about 20m ore of these to possbily help you where as the dealer should be able to get you where you need very quick. I am sorry to say that but very busy right now.

[Joeyls319]

Millman,

Thanks anyway. I appreciate your time and effort. I'll let you know how I make out.

 

Thaks again

 

Joey

[John Summers]

"Povit" distance is "pivot" distance spelled sideways. Pivot distance is required by some posts. It could mean the distance from tool tip to pivot, or possibly the distance between the two pivot axes. Where 'pivot distance' is actually used depends on the post.

"Fanning" is the change in direction of the tool axis in a 5-axis swarf toolpath from the nominal wall ruling direction to the corner ruling direction. If you give a fanning distance, the tool axis vectors will 'fan' from the wall direction to the corner direction.

See P.388 in Mastercam V.9 Mill/Design Tutorial.

[crazy^millman]

Hey John just incase you don't know I am known for my bad spelling that why I didn't want to teach english.

 

I am also known for being a pretty good machinist and atleast making an effort to help people.

 

Sorry I couldn't be of more help Joey.

[steve f]

Joeyls319,

 

One thing that came to mind is to try decreasing the tolerance/linear deviation settings in the toolpath parameters. Increasing tool vector length might help as well. Also, if the corners that your tool is swarfing through has a radius close to the tool radius you might consider using a smaller dia tool so the endmill doesn't "rotate" so tightly around the top corner of your geometery chain/surface and risk gouging.

 

HTH,

 

steve