Originally Posted by QMI2007  ..... Helical milling a counterbore, and the last pass doesnt go around at final depth, it just reaches final depth and retracts out, thus leaving a spiral in the bottom of the hole?????? |
Show us the code.
I have made a mistake in a program that gave me this result. This is an example of the code:
G91 G03 I0. J-.4 Z-.1 F50. L4
This line goes around four times incrementing down 0.1 per circle. But there is a ramp at the bottom of the hole so you need to go around once more to take that out.
Instead of typing the complete line I copy this one using the editor and change the G91 to a G90 to get:
G90 G03 Io. J-.4 Z-.1 F50. L4
I do not want to go around four times so I take the L4 away:
G90 G03 I0. J-.4 Z-.1 F50.
And run the program....and wonder why I still have a ramp at the bottom of the hole???
I forgot to take out the Z-.1 so once I have gone back to absolute the Z moves up to -.1 absolute on the last circle.
When I find it I feel a bit silly.