Messages

71

General Mach Discussion / Re: whats happening with threading

« on: December 06, 2008, 04:44:57 PM »

I added a dwell g04 of a second at the start of each cut, just to give the computer
time to think what it is doing and now I have some very nice threads coming off the machine.
I can live with that for now.Kind of looks like its waiting for the number on the half nut to line up
I have a smooth stepper on its way for another machine, if it works as advertised I'll probably
get one for this machine as well.

72

General Mach Discussion / Re: whats happening with threading

« on: December 06, 2008, 03:54:28 PM »

Hi Art, no the index light does not light up.I made up a new 1 slot disk 20 mm slot width.
I adjusted the pid loop so that with a 2x4 wedged against the spindle the motor holds a nice steady rpm.
The thread pitch is good . If I stop after a cut or 2 and check the pitch its as good as my pitch gauges.
I wonder if having my pulse board connected to a second pp might be the problem.I find it strange though that the x axis
has a mind of its own.

73

General Mach Discussion / Re: whats happening with threading

« on: December 05, 2008, 06:00:24 PM »

yes I am getting the G32 code output.This makes no difference at all.I tried
changing the encoder disk from 1 slot to 4.I ran the spindle calipration and
my true speed and entered speed are on.I even tried cutting a thread with
.001 infeed per pass .With straight turning  this lathe can take .250
on the radius for a doc.It is a hardinge.I'm machining c12l14 the closest thing to butter.

74

General Mach Discussion / Re: whats happening with threading

« on: December 05, 2008, 04:31:06 PM »

And we're back.Redid the whole electrical cabinet .I still have a problem though
I tried the m1076 false/true.Still nothing.However , with the turning plugin
I see that my actual rpm and set rpm are constant with in 1. the locked rpm are very differant.
What controls the locked rpm?

75

General Mach Discussion / Re: whats happening with threading

« on: December 04, 2008, 08:00:34 PM »

before I had a chance to try Hoods m1076 threading macro swap I
pulled all the electronics from the machine ands set about to rewire .
maybe I have some noise or something .Holy crap what a way to spend an afternoon.
  .More to follow.

76

General Mach Discussion / Re: whats happening with threading

« on: December 04, 2008, 01:21:21 PM »

I disagree at the moment on the spindle speed feedback.This problem is only there with treading.
My spindle speed is very stable ,I tried taking very small cuts so no way would the spindle slow down and I get the same
error.I noticed also that when this random x axis takes place it is as if the cycle restarts itself ie,
say 5 cuts fine which should be to finished tread then 5 more cuts tapering in random.

77

General Mach Discussion / Re: whats happening with threading

« on: December 03, 2008, 09:28:38 PM »

my spindle rpm is stable within 1 rpm.This is using a G76.
I'll go out and try a G32 and see what happens.

78

General Mach Discussion / Re: whats happening with threading

« on: December 03, 2008, 06:54:01 PM »

what should I see on the diagnostic screen for the plugin?
My results seem random from one sample to the next.

79

General Mach Discussion / Re: whats happening with threading

« on: December 03, 2008, 06:27:56 PM »

I have enabled the plugin.but no difference.
This is random only on the first pass is the error there all the time
the tool moves the correct pitch but fails to retract in the x axis.
the next pass maybe ok as the next several ,then a random
taper or + or- move of the x axis as the thread is cutting
regular turning works fine.I tried to load the servo motors by
taking a .250" doc on the radius 700 rpm and 10 ipm feed
nice chip but it still worked ok.while threading I cut the doc down to .01
and no good.

80

General Mach Discussion / Re: whats happening with threading

« on: December 03, 2008, 03:16:18 PM »

I knew about the clearance setting.I also pulled off the motor and checked the encoder
coupling, long shot as this is only showing up when threading.I seem to have lots of torque
and this will happen when cutting air.I'll try and hand code a thread and see what happens.