>A trick I recently learned: don't try to push something through a
>conduit, use a vacuum cleaner at one end and have it suck a piece of
>cloth with a wire from the other end.

Hm, interesting solution...But it seems to me the conduit needs to be in
perfect condition - impermeable, smooth,with no wires already in,etc for the
trick to work.

>In the UK it's possible to get inexpensive pocket-sized metal/cable
>detectors, that help electricians determine the presence of screws,
>pipes, live cables etc. buried in walls. I wonder if one of these would
>detect a metallic object attached to the end of your fish tape? Maybe
>you could pulse a coil on the end at a few Hz, providing a way to
>distinguish the fish tape from other detectable objects.
>
>See http://www.plumbworld.co.uk/0-16060 for inspiration.
>
>Regards
>Matt

Yes,the problem with metal detectors is to destinguish from armature. And I
would like to avoid supplying power to the part on the end, that is using
something passive. But these detectors are really inexpensive and are worth
being considered.



Arkady wrote:
> Electricians use a tool known as fish tape to pull wires through conduits
in
> the wall. Sometimes the fish tape gets dead stopped in the wall. I need a
> (simple, cheap) device to determine where exactly in the wall the head of
a
> fish tape is stuck. Is it possible to use any readily available device for
> this, or if not, what principle of work can you suggest for such a thing?
> Generally there is not much room there in the conduit; the fish tape
itself
> is some 6-8 mm in diameter usually made of a dialectical material. I think
> of two coils: one in operator=92s hands and another one (short-circuited)=
  -
> in the head of the fish tape. The impedance of the first one will depend
on
> proximity to the other. Does this have any chances to work?
> Any thoughts will be highly appreciable. Thanks.
>
> Arkady

--
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist

-- =

http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist