Ordered New Lathe

[jareese]

It was suggested that I post this in this forum sub-group as well.

I have ordered a new lathe. An Acra 1740TVS-3. The bad news is I'm going from BXA to CXA. I have A LOT of holders, and 2 different quick release tool posts. One is an Aloris, and the other is a knock-off. I'll also be going from a MT-3 to an MT-4...
So.......... I will be selling my EISEN 1440EV Precision Lathe and MANY accessories for it. I'm thinking of offering everything as a package deal at first, (read that again) so basically someone can get pretty much everything they need, minus tools and inserts, for about the price of the machine alone - Not too sure what that will be yet.
The lathe is only a couple years old and works flawlessly, now... I posted a vid not too long ago on taking an alignment cut on it recently. I only had ~0.0001 deviation over 10" taking 5 thou cuts.

More to come in the near future.
Lathe is located in SW Wisconsin, near Spring Green.

If you know anyone looking for a Taiwanese variable speed 14x40 let them know please.

I am not selling anything right now - I am still currently using it for my gunsmithing business.

 

[Sniperhandle]

Are you equipped to handle 4500 pounds? I remember the issues you had moving a 1800 pound machine. The bigger machines are a little clumsy to operate when you are used to a 14.

 

[jareese]

Are you equipped to handle 4500 pounds? I remember the issues you had moving a 1800 pound machine. The bigger machines are a little clumsy to operate when you are used to a 14.

Right? Having a millwright do this one. Delivery and setup.
Edit: Correction - Current lathe is about 2700lbs

 

[Sniperhandle]

Have you thought of the required power upgrade? You will need at least #6 wire and a minimum of a 50 amp circuit for a 10hp motor.

 

[jareese]

Have you thought of the required power upgrade? You will need at least #6 wire and a minimum of a 50 amp circuit for a 10hp motor.

Wiring should be capable, currently 8 or 10ga - just need to upgrade to a 30amp 220 breaker.

 

[Sniperhandle]

Wiring should be capable, currently 8 or 10ga - just need to upgrade to a 30amp 220 breaker.

I think you should look deeper into this, Your wiring/breaker setup is not big enough for a 10 horsepower motor.

 

[jareese]

I think you should look deeper into this, Your wiring/breaker setup is not big enough for a 10 horsepower motor.

Not a huge setback - it's a short run. I'll make sure all is good prior to operating.

 

[BuffaloBill]

Congrats on the new lathe you have coming. Having that large bore through the spindle would be handy sometimes. And the weight is good. My RML-1440 has what appears to be the same or similar gear change levers, but only has a little over 2” through the spindle.

And although the motor is capable of 10hp, I can’t imagine taking a cut heavy enough to use more than half of that. So I would guess other than starting current, the average current being drawn will easily be inside your 30A breaker.

Do you think starting current will pop the 30A? I’m not sure. I put a VFD on my 5hp so the ramp parameter prevents large starting currents. I have not done this, but couldn’t a 5hp- rated VFD be used with a 10hp motor, as long as the motor wasn’t loaded heavier than what the VFD’s current limits were set to? The VFD will protect itself, etc.

 

[Sniperhandle]

I don't know Bill, You can take shortcuts in some areas but electrical is not an area I am willing to do it on. Insurance companies use that kind of stuff to not pay. Fires are never a good thing and popping breakers is hard on everything too.

 

[BuffaloBill]

I hear you, but the job of the breaker is to protect wiring, prevent fires, etc. As long as the breaker is sized appropriately for the wire, I don’t see how there would be any greater risk. But perhaps regulatory folks might see that differently.

 

[Sniperhandle]

Running to small of wiring is going to build up heat.

 

[jareese]

It has a VFD, so I'll be going from Single to Three Phase via that.

 

[Sniperhandle]

Which requires even more amps.

 

[jareese]

I know a few industrial master electricians. It will be taken care of.

 

[jareese]

So in looking at the wiring schematics - the fast fuses are only 30 amp, but it does have a 15HP Yaskawa inverter. I'll let my electrician know.

Edit: Looks like the model number shown would actually be the Yaskawa CIMR-G7U20111. I may need to wait until the unit is here to verify which model. In looking at Yaskawa's website, it looks like that "should" be the one it will come with.

 

[BuffaloBill]

That’s nice to have a VFD. I see the 30A is specified for 3phase, so like Sniperhandle mentioned, being fed by single-phase will be higher amperage (square root of 3 x 30A). That would be required if expecting to make use of the 10hp rating, which you may not need.

The bulk capacitors after rectification in the VFD circuitry, see a much larger ripple current when being fed by single phase. Aluminum electrolytic capacitor lifespan’s a function of ripple current and temperature. When I was installing one on my lathe the Hitachi lineup maxed out with a 5hp rating on single-phase (on their 7.5hp rated, 3P model). This was maybe 6-7 years ago. Should the capacitor bank wear out, it’s designed to be replaceable. I doubt I’ll accumulate enough lathe hours to do that anytime soon.

 

[jareese]

That’s nice to have a VFD. I see the 30A is specified for 3phase, so like Sniperhandle mentioned, being fed by single-phase will be higher amperage (square root of 3 x 30A). That would be required if expecting to make use of the 10hp rating, which you may not need.

The bulk capacitors after rectification in the VFD circuitry, see a much larger ripple current when being fed by single phase. Aluminum electrolytic capacitor lifespan’s a function of ripple current and temperature. When I was installing one on my lathe the Hitachi lineup maxed out with a 5hp rating on single-phase (on their 7.5hp rated, 3P model). This was maybe 6-7 years ago. Should the capacitor bank wear out, it’s designed to be replaceable. I doubt I’ll accumulate enough lathe hours to do that anytime soon.

Good info - thanks. I will be talking with my electrician today. Still a few months out, but I like to be prepared. The wiring run is fairly short in my little shop, and I think I may already have 40-50A double throw breakers. Easy enough to get if not.

 

[LVLAaron]

Just run a 50 amp circuit. If you have to run a new one might as well be 50. You never know when you’ll want to plug a welder in there.

I say this as someone who has plugged a welder into the oven plug in my kitchen.

 

[xr650rRider]

I would be surprised if that Yaskawa G7 allowed single phase input. I think they are 3 phase input drives. A 15HP drive would be 11,190 watts and 240 volt 3 phase input would be 46.6 amps, so probably rated for 460 volt input.

Those are Sunmaster made lathes.
https://www.sunmaster-cnc.com/pro-fc-v-series-variable-speed-lathe.html

Precision Matthews TL line of lathes are the same and they go up to a 1660 and says will operate on single or 3 phase no converter required..............so it may very well allow single phase input. They say 30 amp input for 5HP. I would bet the 15HP is severely de-rated to allow single phase input.
https://www.precisionmatthews.com/collections/lathes/products/pm-tl-v#product-tabs

 

[jareese]

I would be surprised if that Yaskawa G7 allowed single phase input. I think they are 3 phase input drives. A 15HP drive would be 11,190 watts and 240 volt 3 phase input would be 46.6 amps, so probably rated for 460 volt input.

Those are Sunmaster made lathes.
https://www.sunmaster-cnc.com/pro-fc-v-series-variable-speed-lathe.html

Precision Matthews TL line of lathes are the same and they go up to a 1660 and says will operate on single or 3 phase no converter required..............so it may very well allow single phase input. They say 30 amp input for 5HP. I would bet the 15HP is severely de-rated to allow single phase input.
https://www.precisionmatthews.com/collections/lathes/products/pm-tl-v#product-tabs

Never mind... I figured out my issue. (at least on this subject.) It is in fact a 10HP motor.