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Repairing Pot boxes

 
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Art Marquardt



Joined: 20 Nov 2005
Posts: 99
Location: 625 N25th st Sheboygan,Wisconsin

PostPosted: Thu Oct 11, 2007 8:41 pm    Post subject: Repairing Pot boxes Reply with quote

What type of pot is good to use for the pot box preferrably something more robust. What is the taper on the pot.
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ThomasHudson
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Joined: 26 Sep 2005
Posts: 130
Location: Port Washington WI

PostPosted: Fri Oct 12, 2007 1:23 pm    Post subject: Reply with quote

I checked the Force Yahoo Group list, someone there posted this:

My POT was Clarostat 1934 5K Type J. I could not find
a Digikey part number for that model.

Another guy mentioned that his pot was a Bourns device. Can you get any part ID off your pot? I'll see if I can get one off the spare that I have. Digi-Key tends to have a pretty good inventory; if we can't find a replacement there I have other resources.

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Art Marquardt



Joined: 20 Nov 2005
Posts: 99
Location: 625 N25th st Sheboygan,Wisconsin

PostPosted: Wed Oct 17, 2007 12:27 am    Post subject: Pot Reply with quote

Mine is a Clarostat 10J009 5K-ohm 9343 Type J
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ThomasHudson
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PostPosted: Wed Oct 17, 2007 1:15 pm    Post subject: Reply with quote

I just opened up my old defective potbox from my E-10 (I bought a replacement from Solectria back in 2001) and it has a 5K pot labeled:

C0416066
5K
20 9518

The bottom is probably the date of manufacture (18th week of 1995).

There is no Maker's mark that I can see, which is odd. This is just looking at the bottom and sides (it's still mounted in the box) -- Maybe there's something on the top. I want to take some readings with my meter to see what the resistance readings are at the extremes of travel, then I'll take it completely out and see if I can make out any manufacturer ID.

You know, I figured with two sets of wires coming out of this thing (one for each ignition box) they'd have two separate pots in there, but they don't. Odd.

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Art Marquardt



Joined: 20 Nov 2005
Posts: 99
Location: 625 N25th st Sheboygan,Wisconsin

PostPosted: Wed Oct 17, 2007 7:59 pm    Post subject: pot Reply with quote

Tom there appear to be different part numbers on a lot of these pots
that is the third or fourth number so far yet all are 5Kohm. The reason there is only one pot is so that the resistance is the same for both controllers otherwise diffferences between the two pots would cause speed difference from the controllers. The thing that I would like to know is what is the taper I guess I will just have to measure and guess.
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ThomasHudson
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Location: Port Washington WI

PostPosted: Wed Oct 17, 2007 9:31 pm    Post subject: Reply with quote

I emailed Honeywell (makers of Clarostat pots) and got the following PDF data sheet from them on the Type J pots. I haven't been able to go through the whole thing yet but if you can match up your part# and determine the linearity and rating, please let me know.


J Series Pots.pdf
 Description:
Honeywell/Clarostat J series pots data sheet

Download
 Filename:  J Series Pots.pdf
 Filesize:  1.94 MB
 Downloaded:  1734 Time(s)


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Tom Hudson
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Art Marquardt



Joined: 20 Nov 2005
Posts: 99
Location: 625 N25th st Sheboygan,Wisconsin

PostPosted: Thu Oct 18, 2007 12:19 am    Post subject: Pot data Reply with quote

Tom
Pot data would not download. will go to their web site.
I took the pot out and it is a 1 turn pot and no other info was found. When measured the pot reads a little above 5 Kohms and appears to be a logarithimic taper. That is it starts out at 0 ohms and doesn't change quickly then suddenly jumps up in the last part of travel. I hope this is not a custom taper Type J s are often made custom from what I saw. I will try to find a substitution based on these parameters. Perhaps that is why there are so many different numbers out there.
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Art Marquardt



Joined: 20 Nov 2005
Posts: 99
Location: 625 N25th st Sheboygan,Wisconsin

PostPosted: Fri Oct 19, 2007 7:14 pm    Post subject: no luck Reply with quote

Tom:

The type of pot we are looking for in an exact replacement is not off the shelf I beleive it is custom. It looks very much like the EJ type Honeywell sells but in a custom taper all the ones available seem to be linear taper.
The pot is sealed and possibly oil filled or at least water resistant.
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ThomasHudson
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PostPosted: Fri Oct 19, 2007 8:08 pm    Post subject: Reply with quote

Hmm. I went out and stuck a meter on my bad one out of the truck. Measuring both ways on the terminals I get the following readings in KOhms:

Term 0% 25% 50% 75% 100%
A-B 5.77 4.8 3.0 1.2 0
B-C 0.01 1.4 3.5 5.0 5.85

Not really linear but then again this is a worn out pot that had a dead spot somewhere in there and I was just guesstimating the positions.

Maybe yours is showing really odd taper because of its worn-out condition?

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Tom Hudson
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Art Marquardt



Joined: 20 Nov 2005
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Location: 625 N25th st Sheboygan,Wisconsin

PostPosted: Sun Oct 21, 2007 2:59 am    Post subject: Pot Reply with quote

Tom:
Maybe the trick to finding out what we need is to get a cheap pot that is linear and install it and see if it acts correctly. Mine seems to be much more logarithmic than yours.
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ThomasHudson
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PostPosted: Sun Oct 21, 2007 10:57 am    Post subject: Reply with quote

Good point -- I'll order up some (I need to replace the one in my Force right now; it's been shimmying right around the normal cruise position) and we'll see what happens!
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Art Marquardt



Joined: 20 Nov 2005
Posts: 99
Location: 625 N25th st Sheboygan,Wisconsin

PostPosted: Wed Oct 31, 2007 9:42 pm    Post subject: Pot taper Reply with quote

Well from what I have learned the pot is a custom taper. You can replace it with a 5kohm audio/log or a 10K ohm audio/log pot. The 10k ohm seemed to work a little better for me because we only use a portion of the pots full travel. This means that you can adjust the pot to use mostly the lower resistance portion and just start to get into about the 5k0hm portion of the 10 K pot. Admittedly this is a fine adjustment. If you go above the 5K portion of the curve it effects the power control adjustment but only slightly. Linear pots do not seem to work at all.
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