Undercut Help Needed - MX7

[NunoFelix79]

I'm programming a part that has a few nubs cut around. Some of them generate an undercut.

But the undercut tool (0.031 Lollipop) keep plunging on the side of the part.

Any idea why? I've been messing with settings for over a week, to no success.

 

 

 

[Jayson Kramer]

What path are you using and have you looked at using the Direction option?

[NunoFelix79]

I'm using flowline

Yes I messed around with the direction

[GIZMO 21]

also make sure your normals are set correct. not saying this will fix your problem just a suggestion.

[NunoFelix79]

Sorry what you mean by normal?

[crazy^millman]

Here is a good definition of surface normals. http://en.wikipedia.org/wiki/Normal_%28geometry%29

 

HTH(Hope that helps)

[NunoFelix79]

yes, but doesn't solve my problem.

[Rstewart]

If you share a file someone will be able to fix you up.

[BenK]

It would be much easier for us to help if you posted up a file for us to look at.

[NunoFelix79]

The file is too large to share here.

[NunoFelix79]

We can try dropbox: https://www.dropbox.com/s/iohsyyv2sh105rx/DWT3589.rar?dl=0

[crazy^millman]

yes, but doesn't solve my problem.

 

You asked what is surface normal and I answered your question. Sorry it was not constructive as I had hoped it would be.

[NunoFelix79]

 

 

No, that's fine I appreciate the information. I didn't mean to come across rude or anything like that, if I did I apologize.

[NunoFelix79]

This is the final cavity. I still need to add all other features.

I have tried a blend through the main body. Which worked for the semi finish but doesn't work on a finish.

So now im doing feature by feature. Bringing them in individually.

[crazy^millman]

Okay I see your 2 problems here. Looking at operations #19 to #33

 

#1 You need to set a direction on the Surface Finish Parameters tab. Here you will use this to be like a lead in and lead out to the surface machining operations you have created.

 

#2 you need to go to your Gap Settings in the Finish Flow Line Parameters and turn off the Check gap motion for gouge and the Check Retract motion for gouge and your toolpaths should run just fine.

 

Have a great day.

[crazy^millman]

No, that's fine I appreciate the information. I didn't mean to come across rude or anything like that, if I did I apologize.

 

Nope I am just to the point type of person so right back at you if I came across rude I am just trying to help is all. You did what was needed which was give us a way to help you with a file. I could now be on the same page as you and hopefully I have pointed you in the right direction.

 

BTW Cool looking part!!! I miss making molds sometimes then other times I don't.

[NunoFelix79]

Thanks for the input. I will try that. Right now i'm trying the Surface Finish Contour.

 

To bad you cant just blend the whole thing.

[crazy^millman]

Thanks for the input. I will try that. Right now i'm trying the Surface Finish Contour.

 

To bad you cant just blend the whole thing.

 

Do you mean everything or just the main body area of the cavity? I think you do so easiest way would be to use the Solid Remove to remove all the features you do not need in there. Make sure you are using a copy of the Solid to do this with. Now you will have the body by itself. Then you should be able to toolpath it. Trying to do it with all the features would not be the best way. Reduce it back down to basics and then toolpath the basic shape.

 

HTH(Hope that Helps)

[NunoFelix79]

The main area of the cavity where all the small features are.

[crazy^millman]

Looking that not sure you would want to do the whole shape with blend, but if you wanted to here is what will do it. I did what I said above. I also used a .05 step over change it to the step over you want for the finish you are looking for. If I wanted a bench free finish and good shut off I would probably do a .001 to .0012 step over and would extend my surface above my shut off line maybe .005 or .01 to make sure I get a nice crisp edge.

Edited August 19, 2015 by 5th Axis Consulting

[NunoFelix79]

I meant to blend all the features in the main body.

 

Right now i'm trying the surface finish contour on the nubs. It might work.

[crazy^millman]

So you want to take the lollipop and cut the whole cavity?

[NunoFelix79]

That would be nice.

 

I have programmed everything individually (no i have not cut the part yet) now my new mess is the transform. Keep getting ERROR - Error Regenerating Operation! Transform by Coordinate - Translate Polar. Any idea what is causing it?

[Guest]

Nuno,

 

If you're still at the last place I remember in Salem, you may have to get with Steve Biehl on that, as I recall he did something to how your post handles transforms and may affect your final output.

[NunoFelix79]

It has been working fine. Just this program which i consider huge is giving me a headache