cutter comp in lathe canned cycle

[odessa]

Good Morning Evreybody.

 

I am a new in CNC lathe. While I am using lathe canned cycle i can not get cutter comp. code G41/G42.

Why? Please help.

 

Thanks in a forward.

[Guest CNC Apps Guy 1]

I believe that is one of the restrictions on canned cycles IIRC.

 

WHat control model?

[odessa]

HAAS

[Smit]

It works fine for me in lathe canned rough.

 

Just make sure the tool compensation is set to either wear or control.

[odessa]

Thanks guys.

[Thoob]

I'd like to ask something. In all seriousness, why does anyone use comp on a lathe? I never use it and don't have a reason to. I just offset my geometry to suit. The only reason I see to use compensation, is so that when you put a new insert in, its at the same place and you have your offset already? Can someone explain what other benefits there are to comp on a lathe?

[Reko]

Let's say you program a finish contour for a 1/32" radius WITH comp and the operator can not get a good finish... he can simply put in a 1/64" radius insert, change his feedrate, and change the nose comp accordingly.

 

If there is no comp programmed, he would have to depend on you to re-write the whole program to use a different radius insert.

[Thoob]

Ya I suppose. I guess in my situation I never run into that kind of stuff. My finishes are always 1/64 inserts, lol.

[GoetzInd]

IMO if you are running CAM all changes should be made to the program file and updated setup sheet. That being said I never use lathe comp.

 

Mike

[Brian B 74]

When I ran a CNC lathe (Fanuc 21i-T) all my finishing tool paths had cutter comp (G41/G42). Reason for this - most of my pieces I had to hold +/- .0005" on critical diameters. It was easier to use cutter comp to compensate for tool wear and machine growth. If I used computer for comp I would be constantly reprogramming and uploading new code (which would be a waste of time).

 

Just my $.02

[Guest]

^^^^^ Isn't that what the geometry offset is for?

You don't have to reprogram for those kinds of changes.

 

I have worked with both ways but when I was in charge, there was no comp on lathes