Originally Posted by H234  Sorry for the late reply...this is the sort of program that I've been running:
Code: G90
G50 S 1000
G00 X10.0
Z5.0
T 0606
G97 S500 M3
M8
G00 X1.25 Z0.2
G71 X1.1342 Z-1.250 B60.0 F0.0833 H0.1158 D0.001 U.001 M74 M33
M5
G0 X10.0
Z5.0
M9
M30 I think that the problem I was having was coming from the machine operator adjusting spindle speed in addition to minor diameter. This would certainly explain the multiple threads.
Is it still possible to run the program in auto mode, let it finish, go to manual mode and then return to auto mode and re-run the program?
What is the correct procedure for using sequence restart? |
Not only is it possible to change modes it is usually the case when cutting threads. i.e. Cut the thread in AUTO, program stops, go to manual to maybe debur the front of the thread or something else, check the size of the thread, and then return to AUTO mode to recut the thread to size.
I don't know if you are familiar with the Block Count method of restarting or not, but this is a quick way of restarting mid cycle (of a thread cutting cycle or some like that). If you look in the upper RH corner of the screen you should see a ever increasing number that represents the number of "Blocks" executed since cycle start (resets to zero at program start).
For example, if your BC is at 156 at the start of the threading cycle and it takes 10 passes to cut your thread, you will end up with a BC value of 166 at the end of the thread cutting cycle.
If all you want to do is take another 0.02mm off the thread, restart on 165 and the machine will only do the last pass of the cycle.
To restart, using the BC number, press the Restart Key and enter the number at which you want to restart at. i.e. on screen you should see "RS 165" (without the quotes).
If you want to restart the complete threading cycle, select your line number prior to the start of the threading cycle and key in the line number, after pressing the restart key, eg: "RS N1002"
It has been quite some time since I have actually Run a lathe now, but I am certain this is correct.
The BC number is a very fast way of only taking the last pass in a threading cycle.
IT IS VERY IMPORTANT THAT THE SPINDLE SPEED IS UNCHANGED FROM WHEN THE THREAD WAS FIRST CUT!
Like Okumawiz states, it is possible to recut a thread even if the power is cut, just do not remove the part from the chuck!
Hope this helps.
Brian.