Thread cutting problem G76

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28 Mar 2024 19:08 - 28 Mar 2024 19:11 #297022 by Sergiy_J_S_Automatic
Hi all. There is a problem with cutting threads on a lathe.
I'm writing code
G0 X32  Z2
G76 P4 Z-10 I-0.2 J0.01 K4
G0X50
G0Z100
M5
M30
The cutter moves by a certain amount each pass.
the result can be seen in the photo.
I have an encoder with 3600 pulses, installed through a pulley, so the setting is 3552 pulses per spindle revolution.
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Last edit: 28 Mar 2024 19:11 by Sergiy_J_S_Automatic.

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28 Mar 2024 19:16 #297025 by andypugh
Replied by andypugh on topic Thread cutting problem G76
You need the encoder index to be exactly once per spindle rotation.
Either make the pulley ratio exactly 1:1 or set up a separate index sensor on the spindle.
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28 Mar 2024 19:24 #297026 by Sergiy_J_S_Automatic
But we see that for one revolution we have the value 1 in the parameter: hm2_7i95.0.encoder.00.position

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28 Mar 2024 19:52 #297029 by Sergiy_J_S_Automatic
Your post led me to this diagram.
Is this what you meant?
I will put a separate sensor on the spindle shaft and connect it instead of the Z mark to the input of the control board.
To do this I will need to convert the encoder operation to  single ended mode operation?
 
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29 Mar 2024 11:10 #297091 by andypugh
Replied by andypugh on topic Thread cutting problem G76
I think you can wire a single channel into the differential inputs even in differential mode. Check with Mesa?
There are also differential transciever ICs, but that might be more trouble than necessary.

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29 Mar 2024 19:00 #297133 by Sergiy_J_S_Automatic
Hello. I succeeded after installing a separate sensor instead of the encoder mark.
I used the diagram that I showed in my previous post.
Installed the sensor SS441A. 
 
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