why can not I cut the thread today?

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18 Dec 2017 00:21 #103262 by pkasy
Hello.
I cut a thread for more than a year.
why today when threading with a pitch of 1.5 mm cut thread with a pitch of 2.5?
with a pitch of 1 mm - 1 mm, 0.6 - 0.6
but at pitch 1.5 and 1.49 is still 2.5?
I restarted the axis several times.
the effect does not change.
I put a debugging message - it shows the pitch correctly.
what's wrong again?
(DEBUG,#<P>)
G76	Z[-#<Len>+#<startZ>] P[#<P>] I[-#<I>] J[#<FC>] K[#7*2] H2 L[#<Taper>] E[#<TaperL>] R2

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18 Dec 2017 01:41 #103264 by pkasy
Replied by pkasy on topic why can not I cut the thread today?
G76 P[1.25] makes 2.5 pitch
but depth and length are correct

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18 Dec 2017 12:39 #103285 by andypugh
Replied by andypugh on topic why can not I cut the thread today?
That sounds like the spindle encoder scale has changed.

It isn't that you are using a different gear on the lathe, is it?

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18 Dec 2017 14:13 #103287 by pkasy
Replied by pkasy on topic why can not I cut the thread today?
no. one gear all the time.
1:1 with inverter.

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18 Dec 2017 14:16 #103288 by andypugh
Replied by andypugh on topic why can not I cut the thread today?
If you use halmeter to look at motion.spindle.revs, how much does that number increase by if you manually rotate the spindle by one full turn.

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19 Dec 2017 00:36 #103324 by pkasy
Replied by pkasy on topic why can not I cut the thread today?
1 revs
spindle-revs was 17.78, now 18.78

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19 Dec 2017 01:21 #103327 by andypugh
Replied by andypugh on topic why can not I cut the thread today?
Well, that's odd.
And does moving the Z axis 10mm result in a 10mm movement?

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19 Dec 2017 07:16 #103332 by pkasy
Replied by pkasy on topic why can not I cut the thread today?
Z moves correctly. X moves correctly.
depth and length are both correct.
pitch is not.
here is full sourse
file one:
Warning: Spoiler!

file two:
Warning: Spoiler!

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19 Dec 2017 10:40 #103334 by andypugh
Replied by andypugh on topic why can not I cut the thread today?
I don't see anything obviously wrong with the code.
Adding (DEBUG, P = #<P>) to the code would make sure that the pitch is right at that point.

What happens if you cut a thread from MD using explicit numbers?

Perhaps the encoder counts double at higher speed, how much does motion.spindle.revs increase by if you run for 1 minute at 1000 rpm?

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19 Dec 2017 13:51 #103342 by pkasy
Replied by pkasy on topic why can not I cut the thread today?

Adding (DEBUG, P = #<P>) to the code would make sure that the pitch is right at that point.

yes, i did it first. P is correct.

Perhaps the encoder counts double at higher speed, how much does motion.spindle.revs increase by if you run for 1 minute at 1000 rpm?

about +1000.

What happens if you cut a thread from MD using explicit numbers?

if you will give me a mdi command I will try it.

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