Live tooling question

[Hertz]

Hi guys, I have a live tool lathe. I am making a 5/8" square part from a 1" Round bar with a hole through the middle and tapped holes on the sides. Before I part off, I am going in with the part off tool to .600 diameter then coming in with a chamfer tool to chamfer the square before it parts it off completely. What I want to know is what tool path would I use to accomplish this? I do the front of the part with a c-axis face contour but not sure what to use on the back side as clearly it has to be cut from X and not Z. I do not have a Y axis.

[#Rekd™]

Can you post a file?

[Guest MTB Technical Services]

Hi guys, I have a live tool lathe. I am making a 5/8" square part from a 1" Round bar with a hole through the middle and tapped holes on the sides. Before I part off, I am going in with the part off tool to .600 diameter then coming in with a chamfer tool to chamfer the square before it parts it off completely. What I want to know is what tool path would I use to accomplish this? I do the front of the part with a c-axis face contour but not sure what to use on the back side as clearly it has to be cut from X and not Z. I do not have a Y axis.

 

 

You can use a dovetail cutter with a C-Axis Face Contour path for the backside chamfer.

This way you're still using a G12.1 Polar on the machine.

 

Any other method will have to interpolate XC to approximate each segment of the square you'll end up with a lot of code that can't be comped easily at the machine.

[Hertz]

I cannot upload  file unfortunately.  Picture a square part milled on the c axis from a 1" bar. I need to chamfer both sides of the square. I accomplish the fist side easily with c-axis face contour, same as how I achieve the square. I need to chamfer the other side as well. I tried c-axis - c-axis contour, and it looks ok except for its not following the entities straight, kind of curving as it gets to the corners. I had a pop up saying rotary dia could not be 0. I am not sure what this setting does but it seems it just needs a number cause I put .875 in  and it accepted that.

 

(edit) just saw your post after I submitted my response MTB. I thought of that already but I do not have any dovetail cutters at the moment so I am to use a 1/4" 45 deg chmf mill.

[Hertz]

Ok so I got it to create a chamfer but its slightly bigger near the corners. How do I make that part smaller? Does this have something to do with rotary diameter or is it because the chamfer tool is not square to the entity at the corners?

[The Cathedral]

So you're chamfering on the C-axis, perpendicular to the face of the square? In that case, you'll never get a straight chamfer as it's physically impossible. As the part rotates, the cut changes from sidecutting (like normal) to a sort of plunge-cut.

 

What I would do is use a ball-nose endmill--not a 45 cutter--and walk it around using several stepovers to follow the chamfer. It will take longer but you can get a straight, clean chamfer that way.

[Hertz]

Thank you.