Home |
Search |
Today's Posts |
|
Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
|
|||
|
|||
OT-Carbon brush problem
My neighbour has an elderly but still excellent Johnson outboard. The
starter brushes are worn to the point that they must be replaced. Brushes have been backordered with delivery expected sometime maybe. Now, it's easy enough to get some brushes that are a little too large and file/sand them down to size but the copper flex lead needs to be attached such as to come out the side. A very unusual arrangement indeed but there it is. My question is, having drilled a hole and inserted a suitable flexable lead, how do I fasten it into the hole in an electrically and mechanically satisfactory way? Suggestions please. Ted |
#2
|
|||
|
|||
Ted Edwards wrote:
My neighbour has an elderly but still excellent Johnson outboard. The starter brushes are worn to the point that they must be replaced. Brushes have been backordered with delivery expected sometime maybe. Now, it's easy enough to get some brushes that are a little too large and file/sand them down to size but the copper flex lead needs to be attached such as to come out the side. A very unusual arrangement indeed but there it is. My question is, having drilled a hole and inserted a suitable flexable lead, how do I fasten it into the hole in an electrically and mechanically satisfactory way? Suggestions please. Here's my idea, may make sense, hope it's clearly stated (I seem to be writing unclearly lately). What if you made up a little sleeve of copper that just slid around your wire, and counterbored the back side of the brush so the sleeve could slide into it (but would be restrained from sliding through by the base of the counterbore). Then put the sleeve in one side, put your lead in through the other side, and solder the lead to the sleeve on the backside. Once installed, hopefully something would keep the sleeve/lead assembly from pulling out the back -- maybe the side of a slot or something. Grant Erwin |
#3
|
|||
|
|||
In article ML%se.62966$HI.20551@edtnps84,
Ted Edwards wrote: My neighbour has an elderly but still excellent Johnson outboard. The starter brushes are worn to the point that they must be replaced. Brushes have been backordered with delivery expected sometime maybe. Now, it's easy enough to get some brushes that are a little too large and file/sand them down to size but the copper flex lead needs to be attached such as to come out the side. A very unusual arrangement indeed but there it is. Do the leads come out on only one side? If so, one could find a side lead brush and file it down. Or a large top lead brush, and cut a smaller side lead brush out using a small handsaw. My question is, having drilled a hole and inserted a suitable flexable lead, how do I fasten it into the hole in an electrically and mechanically satisfactory way? Suggestions please. I recall that the leads are inserted into the brush material before it's pressed and cured, as a part of the original manufacture. I suspect that one cannot later attach the leads. I've never seen a brush that didn't have molded-in leads, although I wasn't looking. Joe Gwinn |
#4
|
|||
|
|||
"Grant Erwin" Once installed, hopefully something would keep the sleeve/lead assembly from pulling out the back -- maybe the side of a slot or something. ^^^^^^^^^^^^^^ Good idea. To secure the copper sleeve, how about flaring the hole on both sides, and filling the flare spaces with the same solder used to hold the wire in the copper tube. Another idea would be to flare the copper tube with a punch (gently.) A third possibility would be to cement it in with the liquid that is used for repairing the rear window defroster grid on cars. It's kind of a "correction fluid" consisting of copper dust suspended in a varnish. |
#5
|
|||
|
|||
Ted Edwards wrote:
My neighbour has an elderly but still excellent Johnson outboard. The starter brushes are worn to the point that they must be replaced. Brushes have been backordered with delivery expected sometime maybe. Now, it's easy enough to get some brushes that are a little too large and file/sand them down to size but the copper flex lead needs to be attached such as to come out the side. A very unusual arrangement indeed but there it is. My question is, having drilled a hole and inserted a suitable flexable lead, how do I fasten it into the hole in an electrically and mechanically satisfactory way? Suggestions please. Ted I'd try silver bearing conductive epoxy. It's saved my arse more than once when I had to make a low resistance electrical connection to something I couldn't solder because the heat would damage what it was attached to, or the metal was difficult to solder to. (Think aluminum.) I have no idea how well it would bond to carbon though. IIRC in the olde days stranded leads were attached to brushes by setting them into an oversized hole and then tamping fine copper powder down into the hole around the wire. They must use something like hollow punches for that operation. Jeff -- Jeffry Wisnia (W1BSV + Brass Rat '57 EE) "Truth exists; only falsehood has to be invented." |
#6
|
|||
|
|||
I recall that the leads are inserted into the brush material before it's pressed and cured, as a part of the original manufacture. I suspect that one cannot later attach the leads. I've never seen a brush that didn't have molded-in leads, although I wasn't looking. Joe Gwinn I seem to recall from A&P school brush pigtails being pressed in and cured in as Joe describes... a really specialized process I'm sure. Starter brushes move a lot of amperage... this one might take some thought. Can't think of a much better place to ask than here though. I bet there are company's out there specializing in making up brush assemblies... there must be. Good Luck! Erik |
#7
|
|||
|
|||
|
#9
|
|||
|
|||
On Sat, 18 Jun 2005 18:46:59 -0400, Joseph Gwinn
wrote: In article ML%se.62966$HI.20551@edtnps84, Ted Edwards wrote: My neighbour has an elderly but still excellent Johnson outboard. The starter brushes are worn to the point that they must be replaced. Brushes have been backordered with delivery expected sometime maybe. Now, it's easy enough to get some brushes that are a little too large and file/sand them down to size but the copper flex lead needs to be attached such as to come out the side. A very unusual arrangement indeed but there it is. Do the leads come out on only one side? If so, one could find a side lead brush and file it down. Jerry Martes could certainly find you some side lead brushes, though you might have to file them down to fit. He was in the alternator repair biz for years, "has sources". I'm sure he'd be glad to help. |
#10
|
|||
|
|||
Erik wrote:
snipped I bet there are company's out there specializing in making up brush assemblies... there must be. Good Luck! Erik Here's one I used a long time ago. They say they'll make as few as ONE custom brush. (But at what price?) Jeff -- Jeffry Wisnia (W1BSV + Brass Rat '57 EE) "Truth exists; only falsehood has to be invented." |
#11
|
|||
|
|||
Motorcycle starter brushes are side lead and come in a number of different
sizes. Go to a non dealer repair shop. He probably has a bunch of assorted sizes in his tool box. Maybe something you can cut to size. Karl "Ted Edwards" wrote in message news:ML%se.62966$HI.20551@edtnps84... My neighbour has an elderly but still excellent Johnson outboard. The starter brushes are worn to the point that they must be replaced. Brushes have been backordered with delivery expected sometime maybe. Now, it's easy enough to get some brushes that are a little too large and file/sand them down to size but the copper flex lead needs to be attached such as to come out the side. A very unusual arrangement indeed but there it is. My question is, having drilled a hole and inserted a suitable flexable lead, how do I fasten it into the hole in an electrically and mechanically satisfactory way? Suggestions please. Ted |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Paslode IM250A Cordless Finish Nailer, Stripped Treads Problem | Woodworking | |||
Strange GTAW Aluminum Problem | Metalworking | |||
Widespread problem with HP Omnibook XE3-GFs? | Electronics Repair | |||
Problem with room getting too hot from facing the south (even in late October) | Home Repair | |||
Problem with retrace lines on EIZO F55S... | Electronics Repair |