Surface Finish Contour cutting a drafted solid

[Scott B]

I'm using the surface finish contour to cut 10 degree drafted wall. I'm using a 1/4" ball

end mill, .01 step down and going .6 deep. I'm using a solid that verifies the 10 degree angle and when I machine it I'm getting 10 1/2 degrees. Was wondering if anyone else has had this problem or have heard of someone having this problem.

 

Thanks in advance

[Müřlıń®]

That is wierd. Convert to surfs and see if it does the same thing when you recrunch it

[bellyup]

not specifically that problem, but with surface contour, our trodes almost always end up with drafted surfaces being heavy. i think some of this can be attributed to the fact that on the straight walls, the cutter is essentialy doing spring passes while it's not on the drafted walls, and possibly trying to get too much out of a cutter.

in either case, i use a stand-alone editor with backplot to determine if the problem is being generated by mc. basically a process of elimination.

[Scott B]

I'll try both of those and see what I come up with. I'm taking small cuts so I don't believe the cutter is deflecting.

 

Thanks for the input and cheers

[DavidB]

How does a new member get an Avatar?

[Scott B]

I work for a reseller. I think that's why

[DavidB]

Scott

[3rdstring]

quote:

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The privilege of having a custom Avatar is granted at 200 posts. This applies to both end users and resellers. Employees of In-House Solutions and CNC Software are the only exceptions, and may have their appropriate company logo displayed as an Avatar.

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From the forum Rules & Guidelines

 

Guess the rules are just for the rest of us poor slobs. j/k

 

 

Oh yea welcome to forum!

[Müřlıń®]

It does sound like cutter pushoff...

[within a thou]

try running the cutterpath again see if it cuts stock will tell ya right there if that is the issue at hand. I would gues it has something to do with the cusp height but with a constant z the scallop should be the same. but pesonally why cut a drafted wall with a contour anyways and not use a planar following the angle?

[within a thou]

sorry parrallel not planar using more than one cam system ya get the names mixed up at times

[Scott B]

Murlin I thought the same but they tell me they ran it more than once. I'm going to have them try a different toolpath and see if the draft angle changes.

 

Hope I'm not stepping on toes I do wear a size 12. all and thanks for the Welcome All

[DavidB]

What about a simple 2D contour with draft?