Anyone have a used 500 A rectifier to sell?

[txturbo]

Anybody have one they want to get rid of?

[48Buick]

I picked up a 220 V 3 phase 500 amp on E bay for 150 bucks. I was able to run it on 220 single phase with a big inductor to smooth out the ripple.
Make sure it is the type to run that way though.
Just got to keep looking
48 Buick

[warchild]

If i got a 500Amp Rectifier how many volts would i need on it to plate a bike fram. i seen rectifiers on eBay at 500A and 0-9V. and 500A and 0-6V. would that do the job or would i need one thats 500A and 0-12V. I would like to plate bigger things. i got a 25A rectifier for little things. i don't know a thing about the volts. i just set the amps on my rectifier to were they need to be and go.

[Shevalik]

You will need to calculate the area of the frame. Chrome plating required 1 amp per square inch. I don't know if a 500 amp unit would be enough or not.

[warchild]

I know about the Amps. i want to know about the Volts. what does the number of volts have to do with the plating.

[Shevalik]

You would be better off with the 0-9 volt unit rather than the 6 volt unit. I have a 7.5 volt 300 amp unit that I have a tough time getting the sufficient amount of amps to the cathode. But I know of others that are getting sufficient coverage in the 4-6 volt range.

[48Buick]

I run 4-6 volts when plating chrome. If you are going above this you need to check your connections, amount of anode you have in your bath or any other area you may be loosing amperage.
Remember, its the voltage that is driving the amperage to the part. Bad connections take more voltage to drive the needed amps to the part.
48 Buick

[warchild]

Ok. Thanks people. that is what i wanted to know.

[24Seven]

I have a 300 amp alternator at 24VDC which is = to 600 amps at 12 volts or 1200 amps at 6VDC. A simple circuit to construct is a coil which is made by two differant sized wires wound to the ratio of the same ratio your trying to reduce or increase voltages by. so if you started with a 24 volt source and wanted a 6 volt source 6 is 1/4th of 24 or 1:4

10 turns of heavy gage wire as your two 6 volt source leads in the proximity of 40 turns of smaller wire conected to the 24 volt source will do the trick or 100 turns and 400 if more current is needed. This would be similar to a Tesla type coil configuration in that the larger wire is wraped at a larger diameter then the smaller wire ...kind of like a tube with 400 turns of 22 gage magnet wire with another larger non conductive thin paper tube at its base (if it was standing up) wraped with larger 4 gage wire with 100 turns. The two ends of the 4 gage wire will be your source of 6 volts if the smaller wire was 24V DC . If it was only 12 V DC you would have 3V DC at the larger wire leeds. If a large amount of current is to flow you may need to enclose this in a suitable enclosure that you could fill with veggie oil and boil the air from it then seal it. This would have to be built to handle the heat that may be generated by the higher currents. An easier way would be to hook this alternator to a 10HP motor and use it to charge up a battery bank of 6 volt batteries. You could then configure your 6 volt battery bank to any size voltage or current you desired by simply wiring all the batteries either in parallel (multiples of 6 volt) or in series (multibles of amp hrs) or both IE you want twelve volts so you hook up all the batteries in pairs first then the pairs into series one pair to the others for amp hours of current. Then use the lamps or larger current lamps IE Automotive head lamps in series with the smaller milliamp type bulbs for fine tunning. An alternator of this type cost over $8,000.00 USD new and can be purchased for around $2,000.00 on the used market (US Airforce Jet Starting Alternator/generator/motor unit made by CI Neihoff & Co. built to war time have to count on it military quality). This unit requires that it turn @ 8000 RPM, a large pully would need to be used figured by the RPM of your base motor at its peak power output . It would take 10 - 60amp auto alternators each using around 5 hp or one 50 HP motor turning 10 - 60 amp alternators charging your battery bank to do the same thing. The latter set up configuration could wind up costing more and be a nightmare to configure. This unit is equivalent to an 8.5KW generator or 8,500 watts of pure plating pleasure running through your veins. And actually I have grown kind of fond of it and don't wish to sell it at this time (as I am CURRENT-ly wired to it HE HE), but if I do ....will let ya know. It will always cost more money to go bigger and better....actually the prices of these ready made rectifiers offered here look better all the time....just plug in and GO.