Need help with lathe threading
- Metal Chips
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15 Feb 2023 20:55 - 15 Feb 2023 22:08 #264571
by Metal Chips
Need help with lathe threading was created by Metal Chips
I'm converting a lathe to CNC.
I have everything working except when it comes to threading.
I'm using an encoder that have 60 pulses per revolution, phase A, B, and Z
I can see the signals on all no issues there.
The problem I'm having is,
If the spindle is rotating above 120 RPM the thread pitch is off and motor at 120 RPM does not have enough torque to finish the threads.
It seems to me with the encoder I'm using I should be able to use much higher RPMs, I'm not sure what I'm doing thought when it comes to config files.
I'm using parallel port with a BOB.
Spindle RPM is controlled by hand, not by LINUX CNC.
What do I need to change? I'll attach my config files.
Thank you guys in advance!
I have everything working except when it comes to threading.
I'm using an encoder that have 60 pulses per revolution, phase A, B, and Z
I can see the signals on all no issues there.
The problem I'm having is,
If the spindle is rotating above 120 RPM the thread pitch is off and motor at 120 RPM does not have enough torque to finish the threads.
It seems to me with the encoder I'm using I should be able to use much higher RPMs, I'm not sure what I'm doing thought when it comes to config files.
I'm using parallel port with a BOB.
Spindle RPM is controlled by hand, not by LINUX CNC.
What do I need to change? I'll attach my config files.
Thank you guys in advance!
Attachments:
Last edit: 15 Feb 2023 22:08 by Metal Chips.
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- tommylight
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15 Feb 2023 22:08 #264572
by tommylight
Replied by tommylight on topic Need help with lathe threading
Do you get latency warnings wen starting and enabling LinuxCNC?
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15 Feb 2023 22:17 #264575
by Metal Chips
Replied by Metal Chips on topic Need help with lathe threading
Nope, no issues there.
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15 Feb 2023 22:35 #264580
by tommylight
Replied by tommylight on topic Need help with lathe threading
OK
Is the encoder cable shielded and grounded on the electronics side?
Is the encoder cable shielded and grounded on the electronics side?
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15 Feb 2023 22:42 #264582
by Metal Chips
Replied by Metal Chips on topic Need help with lathe threading
It's shielded but I did not ground it.
What would be a proper spot on the BOB to ground it?
Thank you tommylight for helping!
What would be a proper spot on the BOB to ground it?
Thank you tommylight for helping!
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15 Feb 2023 23:02 - 15 Feb 2023 23:03 #264583
by Clive S
Just a thought is the encoder Z setup with one to one to the spindle
Replied by Clive S on topic Need help with lathe threading
Re: I'm using an encoder that have 60 pulses per revolution, phase A, B, and Z
Just a thought is the encoder Z setup with one to one to the spindle
Last edit: 15 Feb 2023 23:03 by Clive S.
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15 Feb 2023 23:07 #264584
by Metal Chips
Replied by Metal Chips on topic Need help with lathe threading
1:1 gearing on the encoder, yep.
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15 Feb 2023 23:17 - 15 Feb 2023 23:45 #264587
by Metal Chips
Replied by Metal Chips on topic Need help with lathe threading
OK, I've grounded the encoder, let me do a quick test and I will get back to you.
Last edit: 15 Feb 2023 23:45 by Metal Chips.
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15 Feb 2023 23:39 - 15 Feb 2023 23:47 #264589
by Metal Chips
Replied by Metal Chips on topic Need help with lathe threading
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Last edit: 15 Feb 2023 23:47 by Metal Chips.
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16 Feb 2023 01:25 #264593
by skunkworks
Replied by skunkworks on topic Need help with lathe threading
if you think your encoder setup is correct - are you sure your Z axis scale is correct?
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