tripleback,
Need to try to narrow down the problem. It could be a number of things and using versions of MACH
prior to or after .033 may mask the real problem and what it is. To do that i am suggesting you use Mach version .033
as the base line. The problem you describe was fixed in later versions / 033.
There was a problem with fast pc's after version 033, see reply 707/page 71, 716/72 and 720/73 in the thread
Problems Threading on the Lathe. Additionaly there was discussion on the Yahoo about VFD's and motor speed,
where the VFD was changing the speed and at the same time the threading was compensating for the change in speed ,
thus both were fighting each other.
Here is what i suggest you do:
1. post your xml as it currently is
2. go back to version 033 ( may need to clean up the pc to make sure the correct driver is being used)
3. I will assume that your "lathe system is accurate", use the Simple Threading ( lathe ) to generate the gcode
for the thread with output of G32, generate a code for scribing, post the gcode file OR just use the attached
threading file ( just 2" of threading on a 1/2" piece and 26 passes)
4. -do a scribing test, if something goes wrong note the pass number and then post a picture of that threading scribe
along with a close up at the beginning of the first few threads
- was the rpm stable?
5.post the xml used for that scribing
Descibe your pc / a few questions.........
A-what windows system are you using:
B-what is the speed of your pc:
C-are you using the PP:
D-are you using a Smoothstepper:
E-do you have any anti virus or other software which could interfere with Mach:
F-When you run the driver test, what is your pulses per second and kernal speed you ran it at:
G-Set your rpm to 200, what is the rpm in the dro, does it change any:
How about item #1 above and reply to questions A to G for now:
RICH