Bridgeport VMC760 retrofit
- tommylight
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04 May 2025 18:24 #327700
by tommylight
Induction motor has no magnets, no rotor coils, no brushes, yet it works!
It has been the single most important discovery that pushed civilization and the industrial complex forward.
Replied by tommylight on topic Bridgeport VMC760 retrofit
If you mean the induction motor, no, no one even tried it before him. He knew his s#it, for sure.Lots of other men contributed to its discovery and invention too.
Induction motor has no magnets, no rotor coils, no brushes, yet it works!
It has been the single most important discovery that pushed civilization and the industrial complex forward.
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04 May 2025 21:13 #327711
by spincycle
Replied by spincycle on topic Bridgeport VMC760 retrofit
Thanks for the tip Langdons!
I'm a little apprehensive about cheap drivers as I've struggled with the manuals and particularly tuning in the past.
How was your experience setting up and tuning the servos?
Surface finish and accuracy are rather important to me on this machine
I'm a little apprehensive about cheap drivers as I've struggled with the manuals and particularly tuning in the past.
How was your experience setting up and tuning the servos?
Surface finish and accuracy are rather important to me on this machine
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04 May 2025 21:18 #327712
by spincycle
Thanks for the input!
Replied by spincycle on topic Bridgeport VMC760 retrofit
Yep! I'm keen to reuse the majority of the control contractors, breakers and transformers. I've got the full schematics for the machine, so ideally I would splice the original contractor boards into Linux control.I refurbished a 30-year-old CNC router machine at my school.
The original drivers were E-waste.
The original motors are great.
The original transformer (that powers the drivers) is also great (though it's terrifyingly powerful).
The original rectifer bridge + capacitor were also E-waste.
But most of the original switches are still good (one switch got welded contacts due to overcurrent).
Mechanical things outlive electrical things.
Thanks for the input!
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04 May 2025 21:21 #327714
by spincycle
Replied by spincycle on topic Bridgeport VMC760 retrofit
Very impressive. Here I was thinking he just invented Tesla coils!
Lots of other men contributed to its discovery and invention too.
If you mean the induction motor, no, no one even tried it before him. He knew his s#it, for sure.
Induction motor has no magnets, no rotor coils, no brushes, yet it works!
It has been the single most important discovery that pushed civilization and the industrial complex forward.
Please Log in or Create an account to join the conversation.
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04 May 2025 21:23 #327715
by tommylight
forum.linuxcnc.org/10-advanced-configura...ning-detailed-how-to
Replied by tommylight on topic Bridgeport VMC760 retrofit
Analog servos? Velocity mode?
How was your experience setting up and tuning the servos?
forum.linuxcnc.org/10-advanced-configura...ning-detailed-how-to
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04 May 2025 23:30 #327719
by spincycle
Replied by spincycle on topic Bridgeport VMC760 retrofit
Ah using Linux to entirely tune the feedback loop?
I am interested in Ethercat communication, but I am getting slightly cold feet as it appears to be a path far less travelled in this forum.
Am I right in thinking that if you run analog signal and rely on linuxcnc to close the loop, all tuning happens within Linux, as per your link?
No auto tuning through the drives etc?
Thanks tommylight.
I am interested in Ethercat communication, but I am getting slightly cold feet as it appears to be a path far less travelled in this forum.
Am I right in thinking that if you run analog signal and rely on linuxcnc to close the loop, all tuning happens within Linux, as per your link?
No auto tuning through the drives etc?
Thanks tommylight.
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05 May 2025 01:36 #327727
by tommylight
Velocity loop is usually on the drives when motors also use tacho generators.
The tutorial is for using older existing drives, whenever possible i try to use them as they are very good quality and rarely fail, and most of the tuning is already done in the drive as they were in use and working perfectly fine.
Replied by tommylight on topic Bridgeport VMC760 retrofit
Yes, the position loop is in LinuxCNC.Ah using Linux to entirely tune the feedback loop?
Velocity loop is usually on the drives when motors also use tacho generators.
Yes, again only the position loop is handled in LinuxCNC, velocity and torque loops are handled usually in the drives, although LinuxCNC can also handle all of the above on it's own.Am I right in thinking that if you run analog signal and rely on linuxcnc to close the loop, all tuning happens within Linux, as per your link?
No auto tuning through the drives etc?
The tutorial is for using older existing drives, whenever possible i try to use them as they are very good quality and rarely fail, and most of the tuning is already done in the drive as they were in use and working perfectly fine.
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