Broken wires on my Eggfinder

The Rocketry Forum

Help Support The Rocketry Forum:

Swissyhawk

Well-Known Member
Joined
Sep 11, 2013
Messages
260
Reaction score
1
Where the battery wires connect to the circuit board on my Eggfinder, the wires have broken off. This also happened last year on my other unit. The wires seem pretty thin. Is there anything I can do to reduce the likely hood of the wires breaking?
 

DinoAP

Well-Known Member
Joined
Jul 20, 2016
Messages
108
Reaction score
1
Yes, once you repair the wires. Secure the wires into the board with a dab of hot glue. The glue acts as a strain releif and the problem will be solved.
 

mpitfield

Moderator
Staff member
TRF Lifetime Supporter
Global Mod
Joined
Jul 7, 2013
Messages
4,903
Reaction score
431
Location
Toronto, Ontario
Are they soldered to the board or did you get the headers and screw your wires in? If you didn't get the headers then you might want to pick them up, solder to the board then screw your wires in place as well as tie-down your wires with some strain relief.
 

sl98

Well-Known Member
Joined
Dec 27, 2012
Messages
512
Reaction score
77
Yes, once you repair the wires. Secure the wires into the board with a dab of hot glue. The glue acts as a strain releif and the problem will be solved.
Hot glue works great. I use it on every wire soldered to the board.

ImageUploadedByRocketry Forum1488947484.830642.jpg
 

mpitfield

Moderator
Staff member
TRF Lifetime Supporter
Global Mod
Joined
Jul 7, 2013
Messages
4,903
Reaction score
431
Location
Toronto, Ontario
They are soldered to the board. What are headers?
Here are three of my eggtimers, two with top mount transistors, one with bottom mount, all with the green headers soldered for power and on the pyro channels.



Here is a pic of the same type of headers, but sized for my Missile Works screw switches



And just for reference this is how the screw switches assemble, again the header allows me to screw and clamp down my wires, my preference, instead of soldering them to the PCB

 

cerving

Owner, Eggtimer Rocketry
TRF Sponsor
TRF Supporter
Joined
Feb 3, 2012
Messages
4,267
Reaction score
1,579
Where the battery wires connect to the circuit board on my Eggfinder, the wires have broken off. This also happened last year on my other unit. The wires seem pretty thin. Is there anything I can do to reduce the likely hood of the wires breaking?
Are you referring to the circuit board traces? The battery pads are double-sided and plated-through, so it would take a significant amount of force to pull one out of the board. If you're talking about battery pigtail leads, they can break under flex if you use solid wire, or if you have a cold solder joint. I recommend soldering them to the pads through the holes (I've seen people just tack them to the top of the pads, that CAN lead to the traces breaking off), and securing them to your sled with zip ties next to the board. If it can't move, it can't come loose.
 

Swissyhawk

Well-Known Member
Joined
Sep 11, 2013
Messages
260
Reaction score
1
It's the wires that broke, not the board. They broke off above the solder, where the wire itself goes into the wire insulation.

Thanks for the suggestions on the hot glue.
 

ksaves2

Lifetime Supporter
TRF Lifetime Supporter
Joined
Nov 25, 2009
Messages
6,094
Reaction score
370
Location
Central Illinois
It's the wires that broke, not the board. They broke off above the solder, where the wire itself goes into the wire insulation.

Thanks for the suggestions on the hot glue.
I believe with ebay maintenance unsupported wires flex and stranded wires become solid wires after soldering. Recurrent flexing leads to eventual fracture and
the de-soldering iron or wick has to come out. Same thing can happen to the stripped wire that is screwed into headers/screw terminals but if there is excess wire, just need to strip and re-insert. If the wire can move it will eventually break which makes glue gunning and strain relief a good idea for long term
integrity, Kurt
 

Latest posts

Top