I hope this is the right forum for this thread.
Here are my plans for a DIY speaker binding post. II can see questions being asked as to why DIY such a thing. Especially when a pair of Cardas is available for $25 or so. Yes, but not so in India. You have to import the stuff and pay custom duty etc that will push the cost to stratospheric limits. So here we are, a quality binding post for less than Rs. 100 each (around US$ 2).
Here are my plans for a DIY speaker binding post. II can see questions being asked as to why DIY such a thing. Especially when a pair of Cardas is available for $25 or so. Yes, but not so in India. You have to import the stuff and pay custom duty etc that will push the cost to stratospheric limits. So here we are, a quality binding post for less than Rs. 100 each (around US$ 2).
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The material will be pure copper bar. I am thinking of either gold or silver plated, but I suspect bare copper will sound better. A pair of them will be mounted in a 2” x 3” insulated acrylic board. All machining will be done in a CNC. I am also attaching the CAD drawing if anybody is inclined to play around.
Comment please
Comment please
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You must have a killer PC.
We never bother to model threads as the rendering goes all choppy when you rotate, pan, or zoom.
Those look good, but take a look at www.cardas.com you may be able to buy them for less than you can build them. They have the same binding posts.
Jeff
We never bother to model threads as the rendering goes all choppy when you rotate, pan, or zoom.
Those look good, but take a look at www.cardas.com you may be able to buy them for less than you can build them. They have the same binding posts.
Jeff
Thanks for the comments
As you rightly said, that isn't too much of a worry. I plan to use copper spades.
The Nut will have nurling edge. In the rendering I've missed out the retainer nut for the inside. But I need to know if the basic design is ok. Have never seen a Cardas.
Also, can some one confirm that uncoated copper should be better than Gold or silver coating. I don't see oxidation in copper as a major issue.
Thanks again.
Not quite..a vanilla PIII. AutoCad 2000, and SolidWorks for simulation.Milzie said:
Peter Daniel said:
As you rightly said, that isn't too much of a worry. I plan to use copper spades.
The Nut will have nurling edge. In the rendering I've missed out the retainer nut for the inside. But I need to know if the basic design is ok. Have never seen a Cardas.
Also, can some one confirm that uncoated copper should be better than Gold or silver coating. I don't see oxidation in copper as a major issue.
Thanks again.
Those look great...you've inspired me. I'll have to get some copper stock and go crazy on my grandfathers lathe!
Quick suggestion maybe. On the shaft... i noticed it's completely round. What you might want to do...is make that biggest diameter HEX instead of round so that you can attach a wrench to it when you are securing the shaft from the inside. Otherwise...when wrenching a bolt on from the inside...you won't be able to grab it easily.
Good luck!
-Matthew K. Olson
Quick suggestion maybe. On the shaft... i noticed it's completely round. What you might want to do...is make that biggest diameter HEX instead of round so that you can attach a wrench to it when you are securing the shaft from the inside. Otherwise...when wrenching a bolt on from the inside...you won't be able to grab it easily.
Good luck!
-Matthew K. Olson
The length of a shaft is 1.630". In a shaft, on a nut side, the hole is 0.154" and 0.330 deep. When the nut is on, the hole is 0.540 deep, the hole in a nut is 0.160 and the top of the nut is 0.1 thick.
On a mounting side of the shaft (side which is inside a chassiss) there is another hole, 0.193" diameter and 0.65 deep. This helps with soldering a lot. I know because I trimmed some longer posts and it was really hard to solder without that hole.
Dia. of the threaded part of the shaft is 0.373, the neck is 0.240 and the stopper is 0.50 (which is also the dia. of the nut). The mounting nut looks like 5/16 and the thread is finer than 28 (I don't know what's the next standard value)
On a mounting side of the shaft (side which is inside a chassiss) there is another hole, 0.193" diameter and 0.65 deep. This helps with soldering a lot. I know because I trimmed some longer posts and it was really hard to solder without that hole.
Dia. of the threaded part of the shaft is 0.373, the neck is 0.240 and the stopper is 0.50 (which is also the dia. of the nut). The mounting nut looks like 5/16 and the thread is finer than 28 (I don't know what's the next standard value)
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speaking of hex stock, You could make the nuts out of hex stock,
Turn down the area that contacts the spades to a round shape.
No need to machine the wrench flats
These would be even cheaper, and then you would have to make us all some
The reallly cool material seems to be Berillium Copper, what ever that is.
Turn down the area that contacts the spades to a round shape.
No need to machine the wrench flats
These would be even cheaper, and then you would have to make us all some
The reallly cool material seems to be Berillium Copper, what ever that is.
You could get tellurium copper from http://www.mcmaster.com/. Check the item 9100K13. This is the same material that Cardas is using.
>>Alloy 145 Tellurium Copper
Conforms to ASTM B301. Temper is half hard (H02). To Order: Please specify 1-, 3-, or 6-ft. length where prices are shown.
Alloy 145 Sample— Size is 1/2" Dia. x 6" Lg. 9100K337 Each $4.11
Rods— Length tolerance is ± 1/2". Diameter tolerance for 1/8" to 1" is ±.002", for 1 1/8" to 2" is ±.003".
Each
Dia. 1 ft. 3 ft. 6 ft.
1/8" 9100K11 ——
—— $3.93
1/4" 9100K12 ——
—— 10.98
3/8" 9100K13 ——
$12.06 21.46
1/2" 9100K14 $7.55
20.63 36.80
5/8" 9100K15 11.82
32.24 57.48
Each
<<<
And I wouldn't mind to get a pair.
>>Alloy 145 Tellurium Copper
Conforms to ASTM B301. Temper is half hard (H02). To Order: Please specify 1-, 3-, or 6-ft. length where prices are shown.
Alloy 145 Sample— Size is 1/2" Dia. x 6" Lg. 9100K337 Each $4.11
Rods— Length tolerance is ± 1/2". Diameter tolerance for 1/8" to 1" is ±.002", for 1 1/8" to 2" is ±.003".
Each
Dia. 1 ft. 3 ft. 6 ft.
1/8" 9100K11 ——
—— $3.93
1/4" 9100K12 ——
—— 10.98
3/8" 9100K13 ——
$12.06 21.46
1/2" 9100K14 $7.55
20.63 36.80
5/8" 9100K15 11.82
32.24 57.48
Each
<<<
And I wouldn't mind to get a pair.
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