Big mistake today

[Raydee]

I received a Castle/Neu 1717 to put in my PT45 hull and I noticed the wires were very long. After going to Castle's website I read that is is ok to shorten the motor wires. I ended up cutting about 1.5" off the wires and to my suprise no solder will stick to the wires. It seems that the motor I got is the heli version and the wires are completely different than the car motors. Now I have to figure out how I can safely get the coating off the wires so that I can get them tinned. I have read about a dozen threads on the subject and it seems the only way that I can really get the coating off the wires is to scrape it off every strand. I was hoping there was some sort of solvent I can try or even acid that will eat the coating away and not harm the motor.

[BHChieftain]

Is there a way for you to open the can and install new wires? If not, maybe you could contact Neu to see if they'll do that for you.

-Chief

[Raydee]

Well I am sure Neu has a process of stripping the coating off the wires when they tin them. I sent them a email to see if they would share the process with me. If they can't I asked them if they would tin the wires for me.

[m4a1usr]

Theres probably only one decent method of removing the coating off the wires and thats using an aspirin tablet. Yep. I said acetacylic acid. It will remove any and all shellac or varnish coating but you need to be carefull when using this method. The method involves heating up the tablet until it melts and then dip the wires into the melted goo. The problem is the melted tablet emits a very toxic gas so ventilation is extremely important. But it will remove any coating and then you will be able to solder away. Let me dig out the article I have saved and print it out so you understand all thats involved.

John

[Basstronics]

Did you try liquid soldering flux? not the paste junk...

[Raydee]

I can flux it all day long, nothing will stick as long as that coating is on the wire.

John I tried that tonight but I wasn't sure exactly how to do it. It did stink real bad though. Let me know if you find that article.

[MarkF]

You need to make a solder pot and get it over 400 Degrees. You can use an iron pot and put 60 40 solder in it and not the kind with rosen core. Heat it up with a propane torch and get it very hot. The coating wont melt untill you get it to the right temp. Then you dip the wire in and wait for the coating to melt off. Neu also has a special machine that can do it as well. I would send it to Neu if your not comfortable with the solder pot.

Mark

[Raydee]

Yeah I am sure Neu would have it done in no time. I am just not sure if they will work on the Castle motor since it is not their motor. They have always been great to me in the past so it is worth a shot.

[m4a1usr]

A solder pot may work but may not. When I was attempting to remove the coating from the wires on my SV27 motor a solder pot would not work. I fish so I have a serious lead pot. Bigger and hotter then most anyone has in their shop. I can get that bad boy up to 750 f. Wouldnt do nothing to the coating on the SV27 motor wires. Only when I tried the aspirin method could I get the coating off.

I cant find the article I have saved on my home computer. Must be on my work puter. The basic method is to place a tablet on a suitable surface that can be heated. Put your 80 watt soldering iron on top of the tablet and let it start melting it. Place the wire in the melted goo and let it heat up and react to the liquid. You will need to coat the wire up at least 1/4". A bit more is better. You must have very good ventilation. The gas coming off the melted tablet is very toxic. A fan blowing it away is the best method. I can post tomorrow with a reprint of what I have saved but the basics are right here now. Wish I would have sent it home.

John

[RaceMechaniX]

I've got a professional wire brush stripper at work we use for stripping 22 AWG wire. I can give it a shot, but my guess is that it will not do a 100% complete job, but maybe better than anything else.



Tyler

[Raydee]

Thanks for the offer but Steve Neu emailed me last night and said he would help me out.

[LuckyDuc]

I just had the same thing happen with a UL-1 motor. Cut the wires just past the original bullet connector and solder won't stick. I should have just heated up the original connector and pulled it off.

[dasboata]

Theres probably only one decent method of removing the coating off the wires and thats using an aspirin tablet. Yep. I said acetacylic acid. It will remove any and all shellac or varnish coating but you need to be carefull when using this method. The method involves heating up the tablet until it melts and then dip the wires into the melted goo. The problem is the melted tablet emits a very toxic gas so ventilation is extremely important. But it will remove any coating and then you will be able to solder away. Let me dig out the article I have saved and print it out so you understand all thats involved.

John

Live and learn never heard of this before what are they coated with and why thanks chris

[sailr]

Wow! Good to know! Guess I won't mess with any motor wires!

[keithbradley]

I think shortening those wires will also change the kv of the motor. Castle says the air version wires are NOT ok to shorten. They are part of the winding.