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20th Oct 2016, 09:59 PM #31Most Valued Member
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forgot the pics
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21st Oct 2016, 01:04 AM #32
The 7.5V the guy in the video got at about50Hz is about what I expected.
Once the voltage got to 60V and the induction motor started, I couldn't be bothered continuing to watch.
Just for your information, Gazza, universal motors don't care about frequency at all. They will run on DC and any frequency AC. All they care about is voltage.
Not sure what the 1/3 kW motor is for. It will spin a 10Hp easily - until you find a way to get it to generate against a load.....Last edited by jhovel; 21st Oct 2016 at 09:31 PM. Reason: Power Unit added to 1/3
Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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21st Oct 2016, 07:15 PM #33Most Valued Member
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The .5hp motor was just a $20 purchase that gave me a starting point as i found all kinds of information some saying i will need a drive motor 6 times the size of the induction motor others were saying 1/3rd hp of the induction motor so it is varying heaps from the resources I'm finding
i just tried the motor again but i chose to run the induction motors belt on the 38mm shaft and using the .5hp drive motor it spun up a lot faster but still no power, i measured only 3.8v on two of the three way terminals and on the 3rd measured 3v
using a online pulley ratio calculator it said my induction motor should have been spinning at 3815RPM i find it had to believe that much RPM but it would have been over 2000RPM, motor is rated to 2900RPM
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23rd Oct 2016, 05:25 PM #34Most Valued Member
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Ok i get the advice now guys that the motor wont work as i thought it would so i bought this an old welder is it safe to say i can wire it up to use 240v power and it will transform this 240v into 415v? or am i miss reading something from the below link
Zip Start R.P.C.
the welder only cost $50 so i am not at a great loss if it doesn't work
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23rd Oct 2016, 06:46 PM #35
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23rd Oct 2016, 07:23 PM #36Most Valued Member
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23rd Oct 2016, 08:18 PM #37Senior Member
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As I see it, either this project dies or the proponent dies.
I am not going to be involved.
Cheers
Roger
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23rd Oct 2016, 08:31 PM #38Most Valued Member
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23rd Oct 2016, 08:40 PM #39Senior Member
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Not a case of 'saying anything good' so much as waving a small warning flag that there could be some hazards ahead. Meant helpfully.
Cheers
Roger
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23rd Oct 2016, 09:18 PM #40Most Valued Member
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Ok sorry Roger
Guys do u know of any of the older model industrial sized machines that will weld thin aluminium around 1.5-1.6mm?
i am coming across machines like this
Mig Welder 150 | Power Tools | Gumtree Australia Camden Area - Leppington | 1124006565
uni mig 161 mig welder with regulator,trolley leads no bottle | eBay
i have no idea as to what other machines are out there in 240v that can weld aluminium other than AC TIG but my job is way to big for TIG
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23rd Oct 2016, 09:42 PM #41Senior Member
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TIG welding should be able to get up to 6 mm in aluminium IFF you can get the power out of the wall socket. TIG welder output of 200 A may be needed for this.
But that suggests that your 1.6 mm thick Al sheet should be easy with (the right) TIG. Hum?
Cheers
Roger
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23rd Oct 2016, 09:52 PM #42Most Valued Member
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Yeah i'm welding a boat and it requires around 8 meters of bead so looking for a MIG for now that can weld the thinnest possible aluminium, it's hard trying to find a MIG that can do 1.5-1.6mm material without blowing holes this is the reason i was looking into 3 phase 415v because from what i have gathered from looking at the chart pictures online the bigger heavier machinery is friendly with very thin aluminium
I recently had a chinese 175A MIG with spool gun i welded a 1.6mm thickness sample successfully but than i tried to weld a job and absolutely destroyed it and it was at the lowest setting possible to weld aluminium
plus my neighbours wouldn't want to steal a huge older model welder as it wouldn't have any value to them
do u guys think old school welders will be ok to run on VFD? Variable Speed Drive VSD VFD 4 KW 415V 3 phase in 3 phase out | eBay
i understand some of those ebay VFD's do say they can't handle welders but i'm unsure if they meant new technology with all the high end electronics inside a welder
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23rd Oct 2016, 10:02 PM #43Senior Member
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Go with TIG. It is meant for thin metal.
VFDs? Not a chance. Totally wrong.
Cheers
Roger
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23rd Oct 2016, 11:00 PM #44Most Valued Member
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While i was buying the old welder today i got offered this a AC powered HF box that went with my welder but i chose only to buy the welder, is this the HF box for welding aluminium on the AC arc welder? need confirmation before i go back to pick it up
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24th Oct 2016, 07:02 AM #45Senior Member
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The HF box is probably worth having. It puts a 'high frequency' AC voltage on top of the normal welder voltage. This makes it easier to strike an arc and maintain the arc. In fact, using one means you should not have to 'scratch' the electrode on the job to start the arc. Smoother running too. For more info, Google.
Example: High-Frequency Start Box
Cheers
Roger
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