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14th Apr 2020, 04:22 PM #16Member
- Join Date
- Feb 2014
- Location
- Newcastle NSW
- Posts
- 78
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14th Apr 2020, 06:39 PM #17
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14th Apr 2020, 06:42 PM #18
Hi Mark5009, Zumanity,
Welcome to the world of never ending round toits. If you find Alice down there, say Hi for me.Best Regards:
Baron J.
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15th Apr 2020, 10:09 AM #19Diamond Member
- Join Date
- Aug 2019
- Location
- Revesby - Sydney Australia
- Age
- 56
- Posts
- 1,183
Can't is a strong word
Step-up inverter VFDs do exist:
https://www.phasetechnologies.com/voltage-doubling
as do models with regenerative braking.
For hobbyists, though, if your motor really only has 3 winding cables
(i.e. you can't drive as neutral +3wire star, or rewire to delta),
replacing with a 240V motor is much cheaper/easier!
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15th Apr 2020, 10:28 AM #20
Agree with all that. The small, hobby affordable, VFD's don't step up the voltage, but there are a number of technologies that will, including the old school rotary stuff.
Also agree that if the motor can't be easily wired for delta 3 phase 240 volt, I'd just replace it with a single phase motor. There are certainly some advantages in running a lathe with a 3 phase motor and VFD combo, but perhaps not enough to warrant the cost if the existing 3 phase motor needs replacement.
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15th Apr 2020, 11:01 AM #21Member: Blue and white apron brigade
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 7,182
That era Hercus came with a 1/2HP 3P motor (that's all mine had) which could not easily be converted to Delta in the motor junction box but has to have the conversion done inside the motor. This involves digging out a group of 3 wires from amongst the motor coils. Unless you are very comfortable around electrical stuff and confident of rewiriing it correctly its best left to a motor rewinder.
However before you do that you might want to think of the following. Although it's possible to do a lot of useful things with a 1/2HP motor, if the VFD output Frequency (speed) is dropped to 25Hz the motor will only generate about half the rated power. This is why when u grading to a VFD its worth considering doubling the motor power.
Anyway for useful info on VFDs have a look at the two sticky posts in the Woodworkers Electronics forum.
https://www.woodworkforums.com/f271
It will provide a broader view of the whole VFD thing.
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15th Apr 2020, 11:08 AM #22
That's a very helpful link. Thanks.
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15th Apr 2020, 01:57 PM #23
Okay. That was something but it has arrived and is now in place (see pic).
The motor is the original 0.5HP 3-phase 400v unit. The wiring is straight ahead as shown.
Looking at the discussion above, I think I'll take the easy route and go with a 240v single phase. Now the question becomes which one. To make life easy, I note AMH have both 3/4 and 1HP units. Does anyone have an opinion on what is the best way to go give this particular lathe?
Thanks in advance!
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15th Apr 2020, 02:12 PM #24
Safe and sound in its new home.
That wiring confirms what others have said, Y connected, with the other end of the windings buried in the motor. It would be motor surgery to convert it.
I have 2 Hercus's with original single phase motors, both were 1HP.
If you are going with the AMH motors, just confirm with Mal re shaft size, to suit your pulley, and check the mounting arrangement matches yours.
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15th Apr 2020, 03:29 PM #25Member
- Join Date
- Feb 2014
- Location
- Newcastle NSW
- Posts
- 78
While you are considering all that regarding the motor......
Jump on ebay etc and have a look at some quick change tool posts and holders plus some carbide tooling so you can start playing as soon as the motor situation is sorted!
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15th Apr 2020, 03:43 PM #26
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15th Apr 2020, 04:35 PM #27Member
- Join Date
- Feb 2014
- Location
- Newcastle NSW
- Posts
- 78
yeah a lot of people recommend AXA but i've just gone with a Quick Change Tool Post 63x63x63mm #250-100 (Piston Type) on my lathe and i've had no issues after a years service.
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15th Apr 2020, 05:00 PM #28
Thanks, once again.
Motor ordered. Check.
New V-belts. Check.
QCTP. Check.
Cheap tooling. Check.
Upgraded measuring gear. Check.
(Far too much) Way Oil. Check.
Now all I have to do is wait for the motor to arrive and then, after some fiddling, I get to fire it up! Hooray! Exciting times!
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