Ralph,
More than a simple answer but figured the additional comments would be appropriate.
- Reverse threading - The term has no meaning at all to me.
- Could not find the read me file that you mention here.
- Just some basic things to consider in threading
- Spindle rotation direction for the lathe is defined by looking from the headstock towards the tailstock, thus you have CW which
would use an M3 and CCW which would use an M4, else, you need to mannualy set the turning direction of the spindle.
- Left or right hand threading in CNC
- depends on the direction of the tool Z movement which can be plus or minus as input into a wizard from a start point.
- depends also on the spindle rotation direction
The spindle rotation and Z movement along with the following also come into play in defining how the thread that will be cut:
- type tool left or right and how mounted in the tool holder
- configuration such as front or rear toolpost / lathe
- external or internal thread
- M3 or M4 rotation and Z axis movement
Thus you have a number of combinations, 16 total ( I think
) , depending configuration to be used such as front post, rear post, external, internal.
Three wizards available to do threading are:
Simple Threading - Brian Barker
Quick Threads - Scott Shafer
Complex Threading- Brian Barker / Rudy
You will notice that in both the Simple Threading and Quick Threads the left hand threads are done with the M4 to set the spindle rotation for CCW rotation and they assume a front tool post. With a front tool post orient the actual thread tool appropriately in the holder to cut using CCW towards the chuck.
Have fun......,
RICH
Hmm.....maybe above should be added to Threading on the Lathe write up in Member Doc's!