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Unread 06-24-2002, 12:48 AM
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Drill Motor Connections

Posted by Alex at 2/13/2001 8:51 PM EST


Student on team #375, Robotic Plague, from Staten Island Technical High School and Verizon.



How are people connecting wires to the dril motor....we soldered them but they keep falling off.....any suggestions????

Thanks
Alex
Team 375


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Re: Drill Motor Connections

Posted by Joe Ross at 2/13/2001 11:11 PM EST


Engineer on team #330, Beach Bot, from Hope Chapel Academy and NASA/JPL , J&F Machine, and Raytheon.


In Reply to: Drill Motor Connections
Posted by Alex on 2/13/2001 8:51 PM EST:



: How are people connecting wires to the dril motor....we soldered them but they keep falling off.....any suggestions????

We have always soldered them and haven't had a problem before. You should make sure that you have a good solder joint. Make sure that you use flux and the solder flows. It may help to wrap part of the wire around the tab that you are soldering to.

Also, don't put any stress on the solder joint.
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Please Help!!!!!!!!!!!!!!ASAP Drill Motor Connections

Posted by Alex at 2/13/2001 11:12 PM EST


Student on team #375, Robotic Plague, from Staten Island Technical High School and Verizon.


In Reply to: Drill Motor Connections
Posted by Alex on 2/13/2001 8:51 PM EST:



Please help us...we need a soulutioon ASAP

: How are people connecting wires to the dril motor....we soldered them but they keep falling off.....any suggestions????

: Thanks
: Alex
: Team 375


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offering a different solution.

Posted by Anton Abaya at 2/14/2001 12:39 AM EST


Coach on team #419, Rambots, from UMass Boston / BC High and NONE AT THE MOMENT! .


In Reply to: Drill Motor Connections
Posted by Alex on 2/13/2001 8:51 PM EST:



: How are people connecting wires to the dril motor....we soldered them but they keep falling off.....any suggestions????

: Thanks
: Alex
: Team 375

i agree with joe, you should solder and make sure u are using solder with that flux stuff on it so that it sticks. try sanding the tips of the motor's terminals with sandpaper as well before soldering.

if that doesnt work still, the female spade connectors (stake ons? is another term for it i think) and they plug in well. i'd be a little careful though just in case they fall for any reason at all.

good luck.

-anton
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Re: Drill Motor Connections

Posted by Stephen at 2/14/2001 7:18 AM EST


Other on team #122, NASA Knights, from Grafton High School (Robotics team is at NHGS) and NASA.


In Reply to: Drill Motor Connections
Posted by Alex on 2/13/2001 8:51 PM EST:



We have always used spade connectors, but you have to make sure that you crimp them well.

: How are people connecting wires to the dril motor....we soldered them but they keep falling off.....any suggestions????

: Thanks
: Alex
: Team 375


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Re: Drill Motor Connections

Posted by mike johnson at 2/14/2001 8:10 AM EST


Other on team #93, New Apple Corp, from Appleton East.


In Reply to: Drill Motor Connections
Posted by Alex on 2/13/2001 8:51 PM EST:



: How are people connecting wires to the dril motor....we soldered them but they keep falling off.....any suggestions????

: Thanks
: Alex
: Team 375


What we do is apply solder to the motor terminals and then tin the wire. While the iron is still on the wire bring the motor to the wire and attach them. Make sure the solder all melts together you can even add more solder if necessary. You may want to give the person holding the wire a leather glove because the wire will get hot. After the solder has cooled we take hot glue and go around the solder joint basically gluing the wire to the motor. This has eliminated the broken off terminal syndrome.



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Re: Drill Motor Connections

Posted by Ed Sparks at 2/14/2001 8:11 AM EST


Engineer on team #34, The Rockets, from Bob Jones High / New Century High and DaimlerChrysler.


In Reply to: Drill Motor Connections
Posted by Alex on 2/13/2001 8:51 PM EST:



We have always soldered these connections. Your problem may be related to "cold" solder joints. This means that you are not applying enough heat to the parts being soldered to allow the solder to "flow". I use a soldering iron that rates just below a blow torch and I've never had any problems. I also support the wires near the end of the motor with a cable clamp (Small Parts pg. 351).


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Re: Drill Motor Connections

Posted by Al Skierkiewicz at 2/14/2001 1:47 PM EST


Engineer on team #111, Wildstang, from Wheeling High & Rolling Meadows High and Motorola.


In Reply to: Drill Motor Connections
Posted by Alex on 2/13/2001 8:51 PM EST:



We solder all connections to motors because we were burned once with a bad crimp and once with a connector pulled off. Here is how we do it.
1. Terminals on the motors are usually very dirty and won't take solder easily. We clean with wire brush or just scrape with knife blade.
2. Strip #10 wire about 3/4" and seperate strands down the middle. This leaves you equal amounts of wire on both sides and a flat bundle in between to lay flat against terminal.
3. Strip 4" of insulation from a #22 wire or use #22 bare buss wire.
4. Wrap the #10 close to the stripped end with the #22 and solder the #10 and #22 wire. This will leave you with a "v" with the #22 wrap at the bottom.
5. Prepare a 1.5" piece of heatshrink by making a 3/4" cut down one side only and slip onto the wire with the cut facing the end of the wire.
6. Place the open part of the "v" around the motor terminal and squeeze together with pliers, wrap the end with another bare #22 wire so it is tight onto the motor terminal. Using a 50-75 watt iron, "wet" the tip with solder and apply to wire making sure to apply solder to both sides of terminal. Immediately grasp terminal with a large pair of pliers to remove latent heat.
7. Trim any excess wire, check connection and resolder if needed.
8. Slide heatshrink up to cover connection. The slit side goes towards the motor end and the slit should be long enough to allow the heatshrink to extend past the end of the wire 1/4".
9. Use a heat gun to shrink, being careful to not apply a great deal of heat aroung the slit. While still warm and pliable, grasp end of heatshrink with long nose pliers and hold closed until cool.
10. Repeat for other terminal.

We finish by forming wires at right angle and paralllel to motor body. Using a piece of teflon sheet between motor body and wire, we then tie wrap in place. This gives a firm anchor for the wire and some heat insulation between motor and wire.
Come over during competition and we will show you finished assy. or maybe we can get some pics onto web site.
Al



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Re: Drill Motor Connections

Posted by Tim Gates at 2/15/2001 11:07 PM EST


Engineer on team #288, RoboDawgs, from Grandville High School and X-Rite/Delphi.


In Reply to: Drill Motor Connections
Posted by Alex on 2/13/2001 8:51 PM EST:



Alex:

I did not read all of the follow ups, so I hope this is not a repeat. We use a female spade(.187 tab)crimp connector that will accept a #10 wire (yellow insulation). After crimping the connector, we allow solder to flow into the crimped connection. After sliding the connector onto the motor tab, we solder the connector to the tab. This allows a "convenient" mechanical connection with the low resistance of a solder joint. Remember, a bad connection is the same as an under sized conductor and it will get hot when current flows through it. No warranties with the above method but it works for us. By the way, that tab size with #10 crimp are hard to find.

Tim Gates



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