What is wrong with this macro

[jorgehrr]

Hi Guys, help me please -
Why this macro is not working?? (Tap goes in and out in rapid mode)

O1234
G99G97S700M3
--
--
G65P9102B0R1.125F.0625
--
--
M30

Macro
O9102
G1B[ABS[#2]]F[#9*.8]
M5
M4
B#18F[#9*1.2]
M3
M99

This is in a Miyano Lathe 3 axes X,Z and B, so "B" is the axes that is tapping.
Please go easy on me I am a beginner.

George

[jetski]

What controler is on the lathe? Fanuc, Semens, AB?

[jorgehrr]

Fanuc

[jetski]

I took a macro B class several year ago and did some unique stuff with it but I have been out of it just long enough to help you have a bad crash. I would call one of the trainers at Fanuc Hoffman Estates Chicago. They are great and have always helped me when needed. I use to talk to a guy named Fred Romeo. I do not think he is there any more, but talk to someone in his area. Hope this helps.

[jorgehrr]

Thank you.

[sluggo]

just out of curosity, does your lathe not have a tapping can cycle?

[jorgehrr]

Originally Posted by sluggo just out of curosity, does your lathe not have a tapping can cycle?

Yes it does.
G84B--R--F----

But...I usually program the feed rate 20% lower the way in and 20% faster the way out, I get nice thread on any cain of material. But requires a few blocks of programming

Now, if I can write this little macro, I could use it for all my tapping jobs, by writing only one line:
G65B--R--F---

Just like the can cycle but, I have control of the feed rate. Also I'm learning macros and this little one is a good start.

Cheers.

George

[dcoupar]

Two thoughts: Does the G00 change to G01 (on the Check screen) when the macro tells it to, or is the macro calculating the F value incorrectly?

[sluggo]

I have never messed with a tapping macro, but maybe if you can get a look at your machines tapping can cycle you can copy and modify it. I am pretty new to macros, and I was wondering what keeps you machine from stoping the spindle with M5, then starting in revese with M4 and tearing out all your threads, and then backing out. Don't you need it to start pulling out at the same exact time that the spindle goes in reverse. Does any one see what I'm saying, does it work because the machine is reading ahead a few blocks.

[jorgehrr]

Guys -
Thank you for your thoughts.


I'll keep playing with it, and post it when I get it right.
Thank you for you replies.

George

[theemudracer]

Ok first off. Do you have the rigid tap option or are you using a spring loaded tap holder??

Second, If you are trying to rigid tap there are codes specific to rigid tapping that syncronize the spindle with the movement of the machine. These rigid tap codes must be active when trying to do something like you are doing I would think.

Good luck.
Jon

[Caprirs]

I'm not familiar with the Fanuc control. However on most controls I've dealt with, there is a code to switch the spindle to closed loop operation for tapping as theemudracer stated. At the end of the tapping cycle, the spindle had to be switched back to open loop.