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25th July 2014, 10:34 AM #16SENIOR MEMBER
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That 4kW unit would work fine. If you can feed it. As the Chipmaster has a 3HP motor it only needs 2.2kW anyway, so no real dramas there. I'd hook it to a 15A supply and see how it goes. Only time I see problems is very deep cuts on big work pieces that require all the HP the motor can produce, and how often does that happen? Also these lathes have a clutch so it's less strain on things getting a spindle with workpiece moving from a dead stop. I hate using lathes without clutches now both of my main ones have a clutch. Not sure what your wiring access is like but running a 20A circuit is another possibility. Easy to have done and only needs 4mm wire, same as used for a stove. I'd get true 415V 3 phase but this looks like a very viable alternative, as long as that inverte is any good. PDW
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25th July 2014 10:34 AM # ADSGoogle Adsense Advertisement
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25th July 2014, 11:09 AM #17
By sheer coincidence I happened to look for 415v output VFD's last night and put that one in my watch list. I am thinking if I can get one big enough it would be better for my lathe. The existing one will work well on the shaper, driving the huge 3hp delta connected motor I took off the Nuttall lathe. The shaper had a 1hp motor originally, according to Harty.
Dean
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25th July 2014, 11:44 AM #18SENIOR MEMBER
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- Aug 2011
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- victoria
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25th July 2014, 12:05 PM #19
POWER
I believe these lathes came standard with a 3hp 3 ph motor , a lot of grunt for such a small lathe .
Maybe a 2hp single phase replacement motor would suffice for amateur use . But may be a pain fitting it inside the base as new mounts would be required ?
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25th July 2014, 12:09 PM #20SENIOR MEMBER
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25th July 2014, 12:59 PM #21
I already have a 4kw unit driving the lathe. I am looking for a bigger one. My search was more a matter of "watch this space". I am interested in how you go with the 2.2kw unit.
I guess that the 220v output VFD's are aimed at the US market. It would be obvious that 440v output would be far more desirable in oz. The ol' economy of scale problem. What percentage of world population has access to 440v 3ph?
Dean
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25th July 2014, 03:15 PM #22SENIOR MEMBER
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I would *not* do this unless I had absolutely no other alternative. The machine was designed and is rigid enough to use all those HP, why would you want to handicap the machine capabilities if you could avoid it? If you do go this route, at least have the foresight to a possible future owner to hang onto the original motor etc. It cost the ex owner of a toolroom mill I bought $1000 for not doing that. He thought the machine was worth more money because it now had a 240V 3 phase motor driven by a single phase input VFD. My opinion was to the contrary and I paid less than he'd originally paid never mind his conversion costs. If he'd at least kept the original (2 speed 415V) motor I would have paid at least his original purchase price. PDW
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25th July 2014, 06:36 PM #23SENIOR MEMBER
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26th July 2014, 12:57 AM #24GOLD MEMBER
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26th July 2014, 07:19 AM #25Pink 10EE owner
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- Aug 2008
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Interesting reading here for chipmaster owners Chipmaster Variator assembly images
Light red, the colour of choice for the discerning man.
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26th July 2014, 10:30 AM #26
These are a whole new field to learn. I am just getting my head around what I have. How much current do I need? I am in the long drawn out process of installing a 32A, 240v circuit to the shed. My current VFD tops out at 8A on the input for some reason. There is a big gap waiting to be filled there.
I don't know about that one. When was "the first time"? It is my understanding that I bought this lathe with the intention of using a 240v VFD.
Can someone answer a question for me regarding the current carrying capability of 3ph v. 1ph cable. Given the same cross section, how much more current can 3ph carry.
I just found this on the internut
- 1 Phase Motor draws Current = 7Amp per HP.
- 3 Phase Motor draws Current = 1.25Amp per HP
Dean
Edit. I have found that 3ph cable can carry just under 3 times the capacity of the equivalent in single phase cable, but what I want to understand is how the almost triple capacity can be carried with 3 conductors compared to 2 conductors for single phase.
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26th July 2014, 11:26 AM #27
Peter,
you are certainly obtaining a nice collection of machines there.
Dean,
Not only do you have more conductors, but as the voltage is higher you have less amps per HP/KW. Its the amps that cook the cable, not the watts.
Ew1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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26th July 2014, 11:40 AM #28Pink 10EE owner
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3 phase has three actives so each active carries it's share of the electricity...
So if a single phase motor draws 15 amps, that means one wire has to carry the entire 15 amps current flow.
If a similar sized three phase motor draw 15 amps, each wire is only carrying 5 amps..
Of course volts also comes into it... higher the volts the smaller the cable thickness required...
You look at the cable thickness of a car starter motor... 12V, might be a 3hp motor but need massive thick cables..Light red, the colour of choice for the discerning man.
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26th July 2014, 12:28 PM #29
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26th July 2014, 12:50 PM #30Mechanical Butcher
- Join Date
- Oct 2004
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- Southern Highlands NSW
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- 920
Looks like a Dalek (Dr Who).
Love the swarf control.
Jordan
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