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Mori Seiki SL-3 CNC Machine Lathe Turning Center - $2,500 (Burnaby)

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Let's see 20HP at 750W per HP (roughly). So that's 15,000W. Now my home shop does have 220 VAC and a 200A service. So I'd need a single phase to 3 phase converter that draws about 75A to make... what maybe 550VAC 3 phase? Yikes.

But take a step back. Maybe it's possible to retrofit a 1.8Kw Bergerda 3000 RPM AC servo to the spindle. Change any other high voltage motors to Bergerda AC Servos. When all is said and done total outlay might only be $2K.

Now I'm on a road where the power poles have 3 wires at the top. So I could also ask BC Hydro to put in 3phase power for a machine like this. Likely the install costs etc would run about $10K so I don't think that's an option.

How about renting a shop bay somewhere that has 3 phase high voltage power. That's $2K per month so in a year $24K. Hmmm

A major retrofit that throws out old motors and doesn't expect the machine to have a 20HP spindle might be the best option. Assuming the ways and bearings aren't worn out.
 
Old CNC is 8 times out of 10 a nightmare.

I’ve been paid to hook it up for people in garages….. quite a few times.

Our bill (electrical) is usually more then what they paid for the machine.

If they are in a commercial shop with three phase and a few different voltages already set up for distribution, it can be as little as 200$.

Then what if some piece of electronics or the controller goes bad in the old girl…..

99.9% of people do not have the skills or knowledge to get those things fixed and running with certainty.

I’ve got more then a few old machines running in my day, but I number myself with the 99.9% because there’s still times that I’ve thrown up my hands and said, there’s nothing I can do.

In a venn diagram, old cnc machine tools are at the intersection of extremely niche, unobtainable parts, insanely expensive parts, and technically challenging in the first place.
 
jcdammeyer said:
Let's see 20HP at 750W per HP (roughly). So that's 15,000W. Now my home shop does have 220 VAC and a 200A service. So I'd need a single phase to 3 phase converter that draws about 75A to make... what maybe 550VAC 3 phase? Yikes.

But take a step back. Maybe it's possible to retrofit a 1.8Kw Bergerda 3000 RPM AC servo to the spindle. Change any other high voltage motors to Bergerda AC Servos. When all is said and done total outlay might only be $2K.

Now I'm on a road where the power poles have 3 wires at the top. So I could also ask BC Hydro to put in 3phase power for a machine like this. Likely the install costs etc would run about $10K so I don't think that's an option.

How about renting a shop bay somewhere that has 3 phase high voltage power. That's $2K per month so in a year $24K. Hmmm

A major retrofit that throws out old motors and doesn't expect the machine to have a 20HP spindle might be the best option. Assuming the ways and bearings aren't worn out.
Click to expand...
BTW. I was assuming that the controller be replaced with a PC running LinuxCNC and a number of MESA cards. It's quite possible to use the existing axis motors because LinuxCNC itself will take in Encoder signals of various types and close the loop on the motor drive. So if the motor drivers require 0 to +/-10V for example to turn and have a sin/cos encoder output there are MESA cards that can interpret that signal and provide the 0 to +/-10V.

Or if the controllers are toast there was an open source project out of Germany specifically for these types of machine motors called STMBL which drives 3 phase motors and can input a variety of encoder signals.

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The controllers are do-able.

It’s a lathe….. so what if the flippin spindle servo drive or motor are bad.

Those are the numbers that will make a man’s heart flutter.

To quote the famous rapper Eminem: “knees weak arms are heavy, vomit on his sweater already, moms spaghetti”
 
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