[EVDL List]

Geez, Bob -- why so *jumpy*?

[quote]Bob Rice wrote:
> Hi Tom and All;
>
> Here we go AGAIN! The #$@%^& pots are a crappy way to run
>

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[EVDL List]

[quote]On 28 Sep 2009 at 15:25, Eric Poulsen wrote:

> You have the EV equivalent of "volume knob static" as seen in older
> stereo equipment. We used to fix it with something called "Color TV
> Tuner Cleaner" from Radio Shack.

My experience with this stuff is that in the long run it makes matters
worse. One can of spray I got at Radio Shack - which I think was called
exactly that - actually partly dissolved the interior of a pot in an audio
amplifier I had. Vorpal stuff.

The best, safest, and longest-lasting cleaner I know of for potentiometers
(be they in EV or audio use) is the original Cramolin Red. I still have a
tiny bottle of it that I got almost 20 years ago from Caig when they were
distributing it (Caig's current item, Deoxit, is not the same stuff).

You use it very, very sparingly; apply it with the tip of a toothpick
(assuming you can get to the inside of the control). If you use it right,
your kids will inherit your still-mostly-full bottle when you die.

When I checked on it just now, I learned that there is apparently no current
US Cramolin distributor. They seem to have had some kind of falling-out
with Caig (each side says the other was the bad guys). Reportedly you can
buy it directly from the factory in Germany, with really high postage
charges, or from farnell.com in the UK. It's now called Contaclean.

David Roden - Akron, Ohio, USA
EVDL Administrator

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_______________________________________________
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[EVDL List]

[quote]David Roden wrote:
> On 28 Sep 2009 at 15:25, Eric Poulsen wrote:
>
>
>> You have the EV equivalent of "volume knob static" as seen in older
>> stereo equipment. We used to fix it with something called "Color TV
>> Tuner Cleaner" from Radio Shack.
>>
>
> My experience with this stuff is that in the long run it makes matters
> worse. One can of spray I got at Radio Shack - which I think was called
> exactly that - actually partly dissolved the interior of a pot in an audio
> amplifier I had. Vorpal stuff.
>
Yeah, I forgot to mention that it melts certain plastics, but I don't
think any part of the PB6 assembly is plastic, is it?

_______________________________________________
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[quote] soundboats wrote:
> Hello, I am trying to find out if anyone has had any luck in finding
> potentiometers that do not degrade with heavy use. I have tried the Curtis
> PB-6, a Chinese copy of the PB-6, and the Logisystem potboxes. All have
> suffered from the same degradation over time and last no more than 6-8
> months in heavy city and suburban driving (about 100 miles a week in stop
> and go traffic).

I'm having good luck with a VW throttle pedal. It's more complicated
than a simple 0-5k pot so you may have to reconfigure you controller to
talk to it. See
http://carrott.org/cgi-bin/twiki/view/ElectricMini/ThrottlePot I've also
got details there of the Zilla hall effect pedal and a throttle position
sensor style unit from metric mind.

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> Hi Tom and All;
>
> Here we go AGAIN! The #$@%^& pots are a crappy way to run
> controllers/cars! And since the manufacturers can't seem to find
> DECENT ones, or want to spend more than 29 cents for one, but they,
> like the rest of us ,WEAR out!They keep on beating dead horses! The
> Hall Effect setup(changing inductance, by throttle position) is
> Natures most perfect control; Magnetic fields simply DON'T wear
> out,period! Sorta like gravity! It NEVER lets up on us EVers! WHY the
> Hell hasn't controller builders haven't gone to OTHER than crappy
> pots, is beyond me? Let's go back to piston airliners and steam 20
> Century Limiteds? Feh! Had this argument with Peter Senkowsky about
> rebuilding Rapture Controllers. MINE that he did for me, uses a Hall
> Effect(it LOOKS like a solnoid) and works GREAT! Later he went BACK to
> a Pot box, on Dave O.'s Ranger, a step backward? EVery damn Radio in
> my house scrapes and scratches on the volume control! I know I'm
> SUPPOSED to throw radios away every 2 years, but STILL?
>
> Not an EE here, WHY is it harder to set up a controller to do Hall
> Effect RATHER than a Pot Box??Maybe it's a more difficult design?
> Maybe somebody that knows this stuff could chime in? Lee? Got yur ears
> on? Or answer this guyz question in the first place,m before I went
> into Rant mode?
>
> Seeya
>
> Bob
At least in industrial machines, they use "contactless" pots to measure
the position of swashplates in hydraulic pumps and such. They are
probably more expensive than the hall setup but you wouldn't have to
change the controller. I had a good source for suspension monitoring,
but that was years ago.
Something like this? http://www.murata.com/catalog/s30e1.pdf

Some are optical and some are magnetic, they just include a board in
them to simulate a resistor. More often called rotary position sensor.

Would something like this work? or is the voltage output not
appropriate. It depends on how the controller reads the pot :-(
http://delphi.com/manufacturers/auto/sensors/chassis/noncontact/

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Eric and others - thanks for all your input. It has has been a very
interesting discussion. I believe that the current pots (PB-6, their
replacements and the Honeywell ones) are made with a plastic resistive
element. This is what I was able to find in researching the issue. So, I
would steer away from using the TV cleaners.

I will explore some of the options suggested:
1. check out pots from fork lifts
2. check out throttle position sensors from autos
3. find out if the Logisystem controller I have can be run with a Hall
effect sensor
4. Check out cleaning the pots with Cramolin red. I still have my two old
pots that have gone bad, so cleaning one and checking it is no extra cost
for me.

Tom Hruby

[quote]Eric Poulsen wrote:
>
> David Roden wrote:
>> On 28 Sep 2009 at 15:25, [quote]Eric Poulsen wrote:
>>
>>
>>> You have the EV equivalent of "volume knob static" as seen in older
>>> stereo equipment. We used to fix it with something called "Color TV
>>> Tuner Cleaner" from Radio Shack.
>>>
>>
>> My experience with this stuff is that in the long run it makes matters
>> worse. One can of spray I got at Radio Shack - which I think was called
>> exactly that - actually partly dissolved the interior of a pot in an
>> audio
>> amplifier I had. Vorpal stuff.
>>
> Yeah, I forgot to mention that it melts certain plastics, but I don't
> think any part of the PB6 assembly is plastic, is it?
>
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>

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