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Thread: Importing a lathe to Aus
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20th Jan 2021, 09:46 PM #46Senior Member
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i certainly will but at 1.6 ton it will take a while to even get it in the shed.
Doing some mods to the engine crane as the original castors didn't want to roll with just half a ton on it. The rollers are for a manual pallet truck, supposed to be rated at 800kg each so 4 at the front should make the crane move a lot easier.
IMG_20210120_182629.jpg
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20th Jan 2021, 09:54 PM #47Senior Member
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20th Jan 2021, 10:30 PM #48Most Valued Member
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You'll need to be mindful of what you run in the house if you plan on utilising the full 10Hp potential. Air conditioning/heating and electric cookware will soon eat into the 30 odd Amps left after you feed the lathe, not to mention lighting and all the other electrical gadgets that modern living brings.
On the plus side, the VFD will smooth things out a lot.
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21st Jan 2021, 01:13 AM #49Senior Member
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21st Jan 2021, 04:26 PM #50
I really think you should involve a sparky before you get too far along this path of yours.
As far as I know, a 10 HP motor (which draws over 30 amps) requires it's own dedicated circuit hard wired back to the main switch box. If your shed has its own sub-panel, the requirement might be hard wiring back to the sub-panel.
Again AFAIK, the incorporation of a VFD doesn't negate the requirement for hard wiring the dedicated circuit.
a "suck it and see" approach doesn't really cut it when it comes to electrical requirements and safety. For example, do you know by how much the current capacity of your 10mm cable is de-rated because it's buried?regards from Canmore
ian
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21st Jan 2021, 07:59 PM #51Most Valued Member
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Ian, under an "extremely" heavy cut that lathe will use less than 5 hp, so less than 15 amps. That 10 hp motor will never push a load that requires the full power of the motor, a 2.5 sec start up time on the vfd dampens any significant start up current even with a large chuck with a large job in it.
Then if mike wants he can set the max amps in the VFD to maybe 20 amps, he would still have close to 7 hp and would never miss the other 3......
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21st Jan 2021, 08:06 PM #52Gear expert in training
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Just for fun I got the FSWizard app out... 4mm depth, 0.2mm feed in 4140 comes to 6.5HP estimated power draw.
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21st Jan 2021, 08:11 PM #53Most Valued Member
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21st Jan 2021, 08:15 PM #54Gear expert in training
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That was 75mm, but I just put in a few numbers from 30-150 and the difference is negligible (less than 0.2HP) as long as you adjust the spindle speed to suit.
Surface speed 148 m/min, so 630 rpm @ 75mm
Based on a carbide insert with TiAlN coating. Plain TiN coating is about 2/3 that speed and 2/3 power required.Last edited by elanjacobs; 21st Jan 2021 at 08:18 PM. Reason: more info
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21st Jan 2021, 08:26 PM #55Most Valued Member
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elan I am pretty sure that I have done heavier cuts than that on my old macson many times, it is 5 hp and does not seem to blink at it. I have a 7.5 hp lathe also and it loves heavy cuts.
Next time I have someone in the shed with me i will dig out the clamp meter and have a bit of a test.
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21st Jan 2021, 09:13 PM #56Gear expert in training
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I don't know how the app does its calculations, I assume it's just working off shear strength of the material, not accounting for tool geometry and probably a bunch of other things. I mainly use it for surface speed as the work I do is mostly second op stuff chasing surface finish (usually Ra 1.6, sometimes Ra 0.8 um), rather than maximum material removal, so I can't really say how accurate it is for loading.
Be interesting to see how reality compares
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21st Jan 2021, 09:20 PM #57Most Valued Member
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21st Jan 2021, 09:26 PM #58Senior Member
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Your thinking is very close to mine hence the flippant comment about the 20A breaker. I have installed quite a few VFDs but never played with a yasakawa so will not comment a lot till it comes and i can see what it can do. I will most likely limit current to some extent but won't set concrete numbers just now.
I am or rather was an electronics tech for many years playing with all sorts of industrial and specialised computer gear and i also have an electrical license so i do know my way around this stuff even if i don't appear to
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22nd Jan 2021, 03:20 AM #59
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22nd Jan 2021, 08:47 PM #60Diamond Member
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That HP would be at the tool, with the gear reduction of the headstock, the HP required from the motor would be less, i have taken cuts like that on our 5HP lathe and it hasn't stalled (but i did shear the drive key for the feed on our old lathe). At least the hobby blokes can back the speed off a bit, they aren't under pressure to get stuff done like us pro's.
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