A reply from
Hi
Andrew
Yes,
I do remember and thank you for the kind comment - we do try to "shrink
the world" by working fast :-).
This
is actually a conductor not a resistive paint.
I
use the varnish / paint to make resistance axles, but I prefer to glue a tiny 0603
sized chip resistor on the axle first with a dab of epoxy or Loctite 608 (which
is a black rubber filled superglue - fantastic stuff).
Using
a separate resistor gives me better control of the final value, so is a bit
more reliable with some detectors, and to be honest once you get in the swing
of it you can do a hundred axles in a very short time.
Step
one: glue the resistor on the axle close to the plastic sleeve that insulates
the wheel
Step
2: paint the varnish from one pad to the wheel back, from the other pad to the
axle.
Step
3: put axle in the truck - done. It conducts almost as soon as it's applied, so
you can quickly test each truck as you do it. I just clip the meter to a bit of
track, drop the truck on it and put a finger on it to simulate the car
weight... takes seconds.
Only
thing to watch is heavy blackening on the wheel - it can sometimes be an
insulator - getting that off is more hassle than fixing the chip really. (Dremel
does it quickly, wet& dry on a stick does it more tidily but is slower)
I
also prefer to use this conductive varnish as I can also use it for other
things - like as I said, gluing tiny 0.8mm golden whites to the cab roof,
painting the wires with he silver paint and then over painting with "cab
roof colour" so I have a light with NO wires needed - a nice neat job...
I
have lots of the chip resistors (I buy reels of 10k) and they are super cheap,
so would be happy to either source them for you if you want a value I don't
have(they can be hard to get in small qty's) or send you a few if the value I
have suits you. The cost is so small, a few would cost zero :-), never more
than $2to $3 per hundred - and about the same to post.
The
"sourcing" is something I do for many modellers that can't get stuff
locally - more a "modeller to modeller" thing than part of the
business.
Re
the instruction, yes, I can translate a little of it for you. I guess you
really want the key stuff only - what the solvents and cleaners are, the
resistance per square cm, etc... There's not much else there to worry about I
think - I'm home now, but I'll check at the office tomorrow and get Google to
do the bits that stump me :-).
Regards
Richard
-----Original
Message-----
From:
Sent:
Tuesday, October 11, 2005 5:44 PM
To:
Subject:
[NCE-DCC] Re: FW: Resistor Paint for Block Detection
Hi
Richard,
I purchased
white LEDs from you in the past and your service was excellent. Thanks.
I'm
asking this question on the list in case it might help others out.
Is
this the type of resistance paint that can be used in place of a resistor on a
wheel set for block detection? I tried a
paint in the past that would have created an actual short.
We
need something that will allow just enough resistance for occupancy detection
in a block.
Also,
is this the German product that does not have any instructions in English? If so, can you add the instructions in
English?
Thanks
and best,
Andy
Keeney
=====================================================================
---
In
wrote:
>
>
Gents
>
>
if you have no luck I have a very high quality German made
conductive
>
varnish ex stock at $A12 per vial. Its a
small and light item so
>
international 1st class airmail would be very low - est $A3.00.
That'd
make
>
the total cost $A15 / approximately $USD 11.25. Paypal or card is OK
>
>
Its good enough that I use it for wiring SMT LED's in coaches and
loco
cabs.
>
Please contact off list if U are interested.
>
>
>
DCCconcepts,
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