Joining transformer wirer

[gregrae]

I am winding a coil and need to join another length of enamel wirer to the previous enamel wirer to continue winding.
What is the best way to join the wirer together .
I know there is several methods but I would like to get other opinion for this job.

 

[Bluejets]

Burn off insulation from both ends to be joined and/or scrape clean, wrap together and solder or crimp and insulate.
Not a good idea though to join in any case, especially for any high voltage component.
Bound to break down in the future causing shorted turns.

 

[davenn]

I am winding a coil and need to join another length of enamel wirer to the previous enamel wirer to continue winding.
What is the best way to join the wirer together .

what sort of coil ?
what wire size ?
what voltages/current ?

show us a photo

 

[gregrae]

Voltage 240v DC
Current 8 amp
20 gauge

 

[(*steve*)]

My recommendation is to start with a longer piece of wire.

For a whole lot of reasons, joins in the wire are a bad thing.

 

[Colin Mitchell]

The only way is to bring it out as a tap, even if you are not going to use it as a tap.
Obviously none of the others have ever wound a transformer.

 

[(*steve*)]

Good point Colin. (edit: the first one, not the second)

 

[Bluejets]

The only way is to bring it out as a tap, even if you are not going to use it as a tap.
Obviously none of the others have ever wound a transformer.

I have, but it was a long time back and early in the morning here when I replied........

 

[davenn]

Voltage 240v DC
Current 8 amp
20 gauge

I assume you mean AC not DC
transformers don't work with DC

 

[gregrae]

Typo error I should have typed a electro magnet coil

 

[GPG]

240 x 8 =1.92 Kw. Be a nice heater.

 

[davenn]

240 x 8 =1.92 Kw. Be a nice heater.

uh huh

I suspect the OP has more than the AC/DC error in the info he has listed
none of it really makes sense

 

[gregrae]

This is what I am building but the one I am building is 600 mm long.
Will I have to increase the number of turns If I increase the length which increase the iron field.
If so how many turns extra.
Go to this sight below.
http://aaybee.com.au/Magnabend/Building Your Own Magnabend.html

 

[duke37]

To keep the power to a minimum, the space should be filled, you can either use thin wire, lots of turns and lots of volts or thick wire, few turns and few volts. The ampere turns should be the same.

Making the device longer will not affect the necessary number of turns or the current, it will however affect the voltage which will be proportional to length.

 

[GPG]

http://www.coilgun.eclipse.co.uk/coil_resistance_formula.html

 

[gregrae]

Having done a lot of research and number crunching The arcing of switches would be very high.
I will use a microwave transformer as a Isolation transformer an use the interlocks and temperature sensors .and controleis to operate the electro magnetic bender to eliminate arcing and there is no reference to earth.The same as whe do with a live chasey TV using a isolation transformer .
What is your opinion.

 

[duke37]

There must be a high standard of insulation of the coil from the pole piece.
The pole piece should be grounded (earthed).
Thre should be no difficulty with arcing if the DC is provided with a bridge rectifier placed across the coil. This will act as a flywheel diode, so switch the AC input to the bridge.