G32 sync spindle to Z axis lathe

[turbothis]

i remember seeing a video on a guy turning the spindle by hand and the Z axis moving back and forth by this.
i am not finding anything by gooogle
i punch in a " G32 Z1.0 F0.1" in the MDI bar and the feed rate goes into sync mode but nothing happens when rotating the spindle by hand.
i think it might be my M05/off code because it uses the "disableaxis is aat the end.

[TomKerekes]

Hi turbothis,

How did you configure KMotionCNC | Tool Setup | Trajectory Planner | Threading?

[turbothis]

[TomKerekes]

Hi turbothis,

The Threading Parameters look reasonable.

The axis should not need to be enabled to track encoder positions. Does the KMotion.exe | Axis Screen | Axis #2 | Position count when turning the Spindle by hand?

Did you try turning the Spindle both ways? M3/M4 sets the direction the Spindle must move to advance the feed. M5 resets the direction as M3 (CW).

Here are some videos:

[turbothis]

ok yes. there is no condition where the spindle is not reading movement on the KMotion.exe | Axis Screen
i rotate the spindle both ways by hand and get nothing

with the spindle on and turning i can feed by IPM but not the g32.

if i enter M04 G32 Z2.0 F0.1 in the MDi it appears to work fine

[TomKerekes]

Hi turbothis,

G32 may require up to 2 revs to sync to the spindle angle before feeding Z. How many revs are you testing when moving by hand (each direction)?

[turbothis]

lol!!!! same time

ok i got some progress

if i type G32 Z2.0 F1.0 in the MDI
and then rotate the spindle by hand right about 1 3/4 turns it starts working!
so it needs a bunch of input then sync together?

at F1.0 per rotation and F0.1 the Z axis is real spongy in the sync to the spindle.
like it lags and then over shoots and has to comes back a some
this can be real sloppy too depending on the spindle speed
maybe the motor tuning on the Z axis is weak????
the second video, his looks much more responsive than mine.
thanks

[TomKerekes]

Hi turbothis,

if i type G32 Z2.0 F1.0 in the MDI
and then rotate the spindle by hand right about 1 3/4 turns it starts working!
so it needs a bunch of input then sync together?

Yes it must rotate to the "0 degree" position of the Spindle (which is Encoder Position=0 or some multiple of counts/rev) and then do another rev to properly sync.

at F1.0 per rotation the Z axis is real spongy in the sync to the spindle. like it lags and then over shoots and has to comes back a some
this can be real sloppy too depending on the spindle speed
maybe the motor tuning on the Z axis is weak????

Maybe or maybe you are simply exceeding the Z velocity capability of your machine? Do the math and determine from your RPM, Feedrate, and counts/inch of Z what the Z velocity will be in counts/sec. Then test that velocity using the KMotion.exe Step Response Screen. Note make sure you actually test that Velocity and not just set that Velocity but do a small slow move.

Its a good idea to use small Max Following Errors in order to immediately fault if you ever try to do something that the machine can not do.

[turbothis]

i will play around with the Z axis parameters. it will rapid at 240IPM now.
maybe just needs more accel or jerk

[TomKerekes]

Hi turbothis,

it will rapid at 240IPM now.

With F1.0 then a Spindle speed of 240RPM should drive Z at 240IPM.

maybe just needs more accel or jerk

Note Jerk doesn't come into play with feed moves. You might read this.