Back Chamfering with Lollipop on 4th Axis

[NodecoMachine]

Hi again,

 

   Lately we have been getting more and more of these parts (family of parts) so we would like to "fine tune" some of our processes and hand deburring is at the top of the list.  The parts are around 1/2" diameter OD with around a 5/32" diameter flat bottom hole down the middle that sometimes has a big taper (up to 60 degrees and around .46").  On the mill with 4th axis we have to mill a slot (1/16" wide) that intersects the flat bottom hole.  The last bit of deburring that I have to figure out is to debur where that hole intersects that slot.  We would like to try and use a small lollipop cutter to back chamfer that.  I have tried to get a 5 axis curve toolpath to do what i would like but it is not coming out the right way.  Am I on the right track? What do you guys do to accomplish an even break with a lollipop cuter along a curves? Oh and just to clarify the 4th axis is holding onto the OD of the part.

 

  I'd rather not upload a file of the model I'm using right now because I do not want to jeopardize our relationship with this company but I made a sample file (actual file has a lot more features) of an example of the parts we are trying to debur.

 

Thank you,

  Scott

Sample.bmp

[Brian Pallas]

I have chamfered shapes inside of parts with the top side of indexable chamfer mills using 3d chamfer option on a contour toolpath. I had to create a custom tool but it worked good.  I just adjusted the toolpath until it looked right on verify and it comes out good at the machine.  I think that would work good for what you are trying to do.

[Matthew Hajicek - Singularity]

You can also do a ball-mill toolpath like a surface flowline from the bottom WCS, save as geometry, then use it to drive a 3D contour from the top.