Pencil MO

Mikhail Yeremin

Pencil MO

Hello,

Often I have to use a small ball nose end mill to clean up the floor and walls of the pockets where the angle is < 90 deg.

Usually I would create a sketch of a line that is 5-10 deg. away from the wall and use it for my fixed tool axis orientation.

Then I would use "Multi-Axis Curve Machining", "Curve Machining Mode" – “Contact” or “Between curve and part”, and make several zig-zag passes toward the fillet.

I also sometimes would create a small surface and use Isoparametric Machining to achieve the desired tool path. 

Also in some cases "Interpolation" works little better than "fixed axis" under "Tool axis mode", even though generally I try to avoid live 5 axis motions if possible.

A complex part may require creation of a lot of NC geometry, but that is what it takes to achieve a desired tool path.

 

I wonder if a Pencil MO could be used as a single operation to achieve everything that is mentioned above. However, I cannot find a way to control the angle of the cutter in relationship to all the walls.

I only want the tip of the ball nose to do the work, the shank of the tool needs to be a certain angle away from the wall (the wall should already be finished).

It would be nice if I could give it a range of a min/max angle between the walls and the cutter, and let Catia do the work.

 

Does anyone have ideas?

 

Thanks,

Mikhail Yeremin

D-J Engineering

Dave Frank

RE: Pencil MO
(in response to Mikhail Yeremin)

Hi Mikhail,

In NCL, we used to "lie about the cutter". Meaning at any point after the tool change, we can say the cutter is different.  Many fellow COE members have asked for this enhancment.

In the case you describe,  in NCL, I defineed a ball end mill as a conical with 5-10 degrees. This would build in the desired saftey distance when driving with MAFC, with very little effort. You can do that with the Catia we have today, but need to address incorrect cutter statements from any automatic slurping of cutter data into Vericut, shop docs, etc. And what if you want ball cuts for some, and pencil for others?   It's a mess........one we wish our friends at Dassault would address.

 

Since you are looking at a part right now...working on programming these cuts......what changes, enhancments would you like to see?

Dave




Dave Frank  *    Aerospace Dynamics International, Valencia, Ca

5-Axis CNC Programmer

COE Product Co-Chairman, Digital Numerical Control

 

Mikhail Yeremin

RE: Pencil MO
(in response to Dave Frank)

Dave,

Thanks for your reply.

It would be nice to have a MO that can:

  1. Work similar to a Roughing operation in a sense that when you copy and paste a roughing operation and replace a tool of a second operation with a smaller one, then the second tool will remove only the areas that the first tool could not get to. Catia knows how much excess material is left.  A smaller ball nose would be cleaning up the areas that a larger end mill could not get to, but still should be able to offset by some small amount (.002/.005).

  2. Work similar to Multi-Axis Curve Machining , tool axis mode: Lead and tilt, Lead angle=0,  tilt angle = 5, 10, or 20 deg., then define surfaces that the tilt angle is measured from. That would have to be a multi-axis operation.

  3. Work as a multi-pocket operation if possible.

    I realize it might be too much to ask for.

    Any suggestions?

     

    Thanks,

    Mikhail.

Dave Frank

RE: Pencil MO
(in response to Mikhail Yeremin)

Hi Mikhail,

This is an interesting and large enhancment..... actually an complete new MO. I'm sure if Dassault did this people would use it.  I understand what you suggest and will discuss with the developers at my next phone call.

 

To be honest..... most people I talk to ask for Dassault to fix what is broken, and incomplete, before working on the next big thing.

For example people have been asking to replace or reorder drives surface with MAFC for 10 years now.....

 

My personal view.... is to ask for things small and important that we can get in the NEXT version of V5... in 2016

Please take a look at the top 3 post, and add your comments. I am interested in your opinion on priorities.


Best Regards

Dave

 


Dave Frank  *    Aerospace Dynamics International, Valencia, Ca

5-Axis CNC Programmer

COE Product Co-Chairman, Digital Numerical Control