kdoney,
Some commments on threading in general:
1. LATHE - Threading requires a lathe with properly adjusted backlash compensation or better yet almost no
backlash.The motor should not slow down during the threading pass, even though the porgram will account for it
within reason. The lathe should be tested for accuracy before trying to do any threading.
I would suggest that you turn down a piece to diameter, color it with say a blue permanent marker, and then do
a number of fine passes ( say 10 or 20 at 0.0001" ) and inspect to see that each pass follows the same scribed
line. The thread will only be as good as the lathe axis system is.
2. Code - I don't recall any problem with using G32 or G76( single start thread - for multi start you better have a good
system !) If you want, you can change the wizard so that it outputs G32 ( no canned cycle and all passes are coded
individualy ). The only comment is that you should have a Z movement equal to, say 3 to 5 times the
pitch, so the axis has time to ramp to and maintian speed before the threading actually starts. So there is
a relationship here in that your motors must be able to accelerate, but, the wizard informs you if things are not right
for the selected spindle speed.
3. INDEX- You should have rpm display for your range of spindle speed. You may need to adjust slot width
to get it. It can vary some 1 to 2 maybe at a particular spindle speed, the more stable the rpm reading the
better and it should be fairly close over your range.
If you don't have an rpm, I am not sure what the program is using to trigger the the start of the thread cycle,
in fact it may never start it.
In config>ports& pins>spinde setup - check / use - spinde feedback in sync mode and spindle speed averaging.
In config>ports & pins> input signal - make sure you use index for a single slot ....or timing for a multi slot disc
4. Monitoring - You can use the turn diagnostics to monitor the threading cycle.
SO............................................
Make sure your index is working properly and then do the lathe test.
As far as making "U" instead if a sharp "V", i think it's a setup problem also, if the steps per unit are correct then it's
mechanical problem, and the lathe test will show it.
Hope this helps,
RICH