Bridgeport VMC760 retrofit
- spincycle
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05 May 2025 21:50 #327793
by spincycle
Replied by spincycle on topic Bridgeport VMC760 retrofit
Hi Langdons,
Yeah definitely affordable!
We run 415v 3ph in Australia. Weirdly enough there isn't a huge amount of aliexpress drives that cater to that voltage.
Inovance, Leadshine and Delta do however offer 400v stuff which is nice.
Yeah definitely affordable!
We run 415v 3ph in Australia. Weirdly enough there isn't a huge amount of aliexpress drives that cater to that voltage.
Inovance, Leadshine and Delta do however offer 400v stuff which is nice.
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05 May 2025 23:28 #327800
by tommylight
3 for 3, nice!
New drives can also be controlled by step/dir and also have encoder outputs, and those can again be used in LinuxCNC.
And there are several boards from Mesa that can be used, not just 7i97, a lot of combos there so when you are ready to order stuff, ask here first as we have the Mesa Master with us here, always, in the form of PCW.
Replied by tommylight on topic Bridgeport VMC760 retrofit
Yes.I assume the procedure is similar for newer drives if running analog?
Yes.I would tune the velocity/torque in the drive software, then tune position through Linuxcnc.
Yes.It looks like a few of the modern servo drives I've looked at have encoder outputs. Those will just run back into a Mesa card like the 7I97?
3 for 3, nice!

New drives can also be controlled by step/dir and also have encoder outputs, and those can again be used in LinuxCNC.
And there are several boards from Mesa that can be used, not just 7i97, a lot of combos there so when you are ready to order stuff, ask here first as we have the Mesa Master with us here, always, in the form of PCW.
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05 May 2025 23:34 #327801
by langdons
Replied by langdons on topic Bridgeport VMC760 retrofit
Whoa, hold up.
Households in Austrailia use 415VAC?!
(little kid): "Hey daddy, what's this? ...kzapp! [kid gets electrocuted]"
Households in Austrailia use 415VAC?!
(little kid): "Hey daddy, what's this? ...kzapp! [kid gets electrocuted]"
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05 May 2025 23:42 #327802
by langdons
Replied by langdons on topic Bridgeport VMC760 retrofit
3-phase power, in all its greatness, is something of a headache.
(not for induction motors obviously)
(not for induction motors obviously)
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06 May 2025 00:12 #327807
by tommylight
Replied by tommylight on topic Bridgeport VMC760 retrofit
We have 3 phase power in houses, always, rated at 3x380V +-10% and can pull 16A at home from any plug, 32A in workshops/garages.
Lately the local provider started complaining if we pull over 15KW over long duration's, i do not blame them, we have 100A at our disposal.
To spite Americans (since i still refuse to go there despite being granted a Green Card 17 years ago), we can charge a Tesla at home with 22KW on any socket around the house, 60KW if we push it!
And that is with no permissions or requests or installing superchargers!
Lately the local provider started complaining if we pull over 15KW over long duration's, i do not blame them, we have 100A at our disposal.
To spite Americans (since i still refuse to go there despite being granted a Green Card 17 years ago), we can charge a Tesla at home with 22KW on any socket around the house, 60KW if we push it!

And that is with no permissions or requests or installing superchargers!
The following user(s) said Thank You: COFHAL
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06 May 2025 13:51 #327852
by langdons
Replied by langdons on topic Bridgeport VMC760 retrofit
Why would the utility company complain?
More power = more $$!
What electrical plugs are used in Austrailia?
Tommylight, are you Austrailian?
More power = more $$!
What electrical plugs are used in Austrailia?
Tommylight, are you Austrailian?
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06 May 2025 13:58 #327854
by langdons
Replied by langdons on topic Bridgeport VMC760 retrofit
In Canada/USA,we have 240V outlets, but they are rarely installed or used.
I've never seen a 20A plug either, despite the existence of 20A outlets.
Weird that it's 16A in hot Austrailia, but 15A in cold Canada.
I've never seen a 20A plug either, despite the existence of 20A outlets.
Weird that it's 16A in hot Austrailia, but 15A in cold Canada.
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06 May 2025 14:01 #327855
by langdons
Replied by langdons on topic Bridgeport VMC760 retrofit
50 hz is inferior to 60Hz b/c transformers, motors, etc. need to be bigger and more expensive.
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06 May 2025 20:55 #327888
by tommylight
The only valid difference is the induction motors spin faster at 60Hz, everything else is pretty much irrelevant.
Replied by tommylight on topic Bridgeport VMC760 retrofit
Was this from chatGPT?50 hz is inferior to 60Hz b/c transformers, motors, etc. need to be bigger and more expensive.
The only valid difference is the induction motors spin faster at 60Hz, everything else is pretty much irrelevant.
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06 May 2025 22:34 #327904
by langdons
Replied by langdons on topic Bridgeport VMC760 retrofit
I never use ChatGPT.
It sucks.
The higher the frequency, the higher the power-to-mass ratio.
That's why high frequency switching power supplies are smaller and lighter than comparable line-frequency power supplies.
It sucks.
The higher the frequency, the higher the power-to-mass ratio.
That's why high frequency switching power supplies are smaller and lighter than comparable line-frequency power supplies.
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