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Old 17th January 2007, 10:55 PM   #1
VvvvvV is offline VvvvvV  United Kingdom
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Default strips of ultra-flexible resistive material? Like a VHS tape?

I am looking for some ultra-flexible resistive strip that has a resistance of about 2k/cm.

VHS tape would be perfect but it's resistance is much too low, 10 K. of resistance takes about 26cm, it is about 0.5k/cm resistance

Please help me to find some specialised material/flexible coating that can be glued onto a ribbon that is about 2k/cm, it's really important project I would be very indebted to you

would it be possible to take a resistive wire/metal, to powder it up and mix it into a silicon coating?
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Old 17th January 2007, 11:15 PM   #2
SY is offline SY  United States
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Is mass important?
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Old 17th January 2007, 11:33 PM   #3
VvvvvV is offline VvvvvV  United Kingdom
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flexibility is most important, same as nylon, can have the same mass as lead even.
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Old 17th January 2007, 11:37 PM   #4
SY is offline SY  United States
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Then I'd load up some clear-coat with carbon black and paint it on. What's the ribbon made of?
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Old 17th January 2007, 11:45 PM   #5
Tim__x is offline Tim__x  Canada
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VHS tape cut into fourths?
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Old 18th January 2007, 12:01 AM   #6
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what about a thiner slice of video tape?

what I really mean is, is the thickness of the tape important too?
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Old 18th January 2007, 02:09 AM   #7
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How about something like this?
(not to scale)

Click the image to open in full size.
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Old 18th January 2007, 03:12 AM   #8
KISS is offline KISS  United States
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You never said, how long this strip needs to be or how wide. From this you can determine the resistance, resistivity --> material, thckness.

Just about any resistive material can be RF sputtered. That;s how the foil potato chip bags are made.

You can also evaporate material onto a moving web in a vacuum onto high temperature materials such as Upilex. http://www.upilex.jp/e_tcm.html

Properties:

http://northamerica.ube.com/page.php?pageid=81
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Old 18th January 2007, 03:37 AM   #9
Chartal is offline Chartal  Canada
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What is your application?
Maybe there is better way to do it.

-What is the length (center to center pulley) and width of your belt?
-Is the belt can make more then one turn or just fwd/rev with limited travel?
-...

Possible solution.
-Rotary encoder
-Potentiometer (just if limited travel)
-...
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Old 18th January 2007, 08:22 AM   #10
VvvvvV is offline VvvvvV  United Kingdom
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fantastic, that will keep me going with a reading material for a while.

the idea is to make some homemade ribbon controllers/faders to patch into a MIDI keyboard,so that the slide distance is the same length as the finger because it's going to be ultra performance ergonomics, and virtually zero friction/actuation force to adjust.

so the material can be anywhere in between 0.1 mm and 2cm, have perfectly linear resistance, and flexible, anything like that.

ordinary potentiometers would be okay, but they are more stiff, and more unwieldy to play performance music with than a ribbon fader.

It's a ribbon arranged like a conveyor belt, same as the image in the OP.
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