Canned cicle for descent profiles?

[mr_campbell]

Hello everybody. I need some help, I have a problem with my lathe and I don´t know how could I solve.

I´ve Fanuc 21-t control, and I can´t schedule descent profiles with G71. For example, if I want to make a inverted chamfer, it make the chanfer in one pass!.

The solution wich I´ve found is use a cicle that repeat the profile and go down,(i dont remember wich G, G73 I think..) but I dont like it becouse is a waste of time.

I hope you understand me, becouse I´m still learning english.

Thank you very much

[dcoupar]

Hello everybody. I need some help, I have a problem with my lathe and I don´t know how could I solve.

I´ve Fanuc 21-t control, and I can´t schedule descent profiles with G71. For example, if I want to make a inverted chamfer, it make the chanfer in one pass!.

The solution wich I´ve found is use a cicle that repeat the profile and go down,(i dont remember wich G, G73 I think..) but I dont like it becouse is a waste of time.

I hope you understand me, becouse I´m still learning english.

Thank you very much

Please post your program here so we might see what is wrong with it.

[mr_campbell]

This post is also posted in Canned cicle for descent profiles?. Can anyone close here? thank.







I´ve problems with profiles like that. The program wich I make is: (The raw has a 30mm of diameter)

T0707
G50S1200
G92S150M3
G0X30Z2
G71U2R.5
G71P100Q200U0W0F.2
N100 G0X18
G1X20Z0
Z-10
X15Z-15
Z-25
X24
X25Z-26
N200 Z-30
G0X200Z200

With this program the machine make me the correct profil until diameter of 20, then it down to x15z-15 in one pass.

I´m thinking in start the cycle in x30z-25 and go from left to right..
The program will be:

T0707
G50S1200
G96S150
G0 X32Z-30
G71U2R.5
G71P100Q200U0W0F.2
N100G1X15
Z-15
X20Z-10
N200Z0
G0X200Z200

But the problem is the advance when the tool down...

[mystiks]

I´ve problems with profiles like that. The program wich I make is: (The raw has a 30mm of diameter)

T0707
G50S1200
G92S150M3
G0X30Z2
G71U2R.5
G71P100Q200U0W0F.2
N100 G0X18
G1X20Z0
Z-10
X15Z-15
Z-25
X24
X25Z-26
N200 Z-30
G0X200Z200

With this program the machine make me the correct profil until diameter of 20, then it down to x15z-15 in one pass.

But the problem is the advance when the tool down...

If your doing what you call descent profiles, you want to use type 2 G71 cycle which is how would i spell it, "activated" by inserting both X and Z on first line after G71:s

Even W0 will work.

G71U2R.5
G71P100Q200U0W0F.2
N100 G0X18 W0

[mr_campbell]

Thank you mistiks. I didn´t know about G71 type II.

Tomorrow I will trye to activate G71 type II and I say to you what has happened.

Thank you again

[mr_campbell]

Thank everybody, I have probed today G71 type II and worked correctly