Chamfering Internal Opening on a Curve

[Rotary Ninja]

I have a part that looks like this...

 

I need a .010" chamfer around the internal curve where the arrows are pointing. This is basically just a debur operation to make the part look as nice as possible. The part is on a horizontal machine. You are looking at the top view and these side holes are the last operation. I was thinking I could use one of these Harvey Tool 90 Degree Double-Angle cutters. The through hole is 7/16" so I was considering a 1/4". But the part would need to rotate around to make this work. There is only .050" from the bottom of the hole to the floor at the bottom of the pocket. Can someone please give me an example program to show me how I might do this?

 

Thanks.

[Smrk]

i just tried to do some fast solution. I created box like yours and create curves on edges on internal holes. Select them as contour (option 3D contour chamfer) with custom profile tool, and it looks like it could work.

[robk]

_{I use these cutters a lot. They work great for the right application. I don't think this is the right app. for it though because IMO you'll either gouge the part or not clean it enough in some areas. I did not draw anything out to support my comment though and I don't know what tolerance you need to hold.}

_{I would do it with their undercutting tool instead} http://www.harveytoo...eywords_E_52820

[Rotary Ninja]

I was just thinking the same thing Rob. It's like you were reading my mind as I was thinking lolipop tool would be the only thing that would do it. The shank would hit if I rotated. With the lolipop I would be rotating away from the tool. Or should I just use a 3D contour and play with the offsetting in the toolpath parameters?

[robk]

I'm sorry Ninja, but I can't help you with the toolpath (I use NX) but I remember doing all that pretty often when I did use mastercamway back in the day.

I'm sure somebody will jump in and give you the solution.

Sorry

[Rotary Ninja]

No worries. I think I have it figured out. I have yet to try what I am thinking, but I am hopeful

 

Anyone else is more than welcome to chime in. There is actually only .030" from the bottom of the hole to the floor. But this is just a debur. So nothing too difficult.

[Roger Peterson]

Here is an example file that should help.

LOLLIPOP CORNER BREAK.MCX-6

[Guyinthedesert]

No worries. I think I have it figured out. I have yet to try what I am thinking, but I am hopeful

 

Anyone else is more than welcome to chime in. There is actually only .030" from the bottom of the hole to the floor. But this is just a debur. So nothing too difficult.

 

+1 on the lollipop

[RayD]

Like this?

 

3d Curve and offset the depth and give the stock on walls a "-" value to make it overcut.(Or use wear on the control)

RAY.MCX-6

[Rotary Ninja]

It's great seeing the different ways to do this. I've never ran into a situation like this, but I like to try to debur as much stuff as I can and I really wanted to try to get that edge done.

 

Thanks a lot guys!

[Jayson Kramer]

I added a .01 chamfer and did flowline with the lollipop. it will be the last op called CADCAMs Flow path

[cincy k]

I gotta say thanks for the samples. The sample files prove to be perfect resources to truly understand how different people approach this.

[Rotary Ninja]

That is why I love this site so much. These guys are great. Thanks Jay. I never even thought of surfacing it on there