I don't think that it can be very difficult. can someone point me in the
right direction to start figuring outhow to make one that is more flexable?
jw_nyc at yahoo dot com
If the sears device you are describing is a device which detects when
a tool is drawing current, and then switches on a vacuume, then there
is no reason why you cant run as many tools as you like from it
providing you dont overload it by using too many tools at once.
j <j...@nospam.yea> wrote in message news:<Vqvrb.19754$9M3....@newsread2.news.atl.earthlink.net>...
I suppose I could get a new dust collector that would run on 220 volts
but then because of the amount of amps these tools draw I wouldn't want
to run them on the same circuit anyway.
> If the sears device you are describing is a device which detects when
> a tool is drawing current, and then switches on a vacuume, then there
> is no reason why you cant run as many tools as you like from it
> providing you dont overload it by using too many tools at once.
yes, but you've hit the nail on the head. The tools I want to use draw
too much current to run on one circuit. In addition there is a limit to
the number of amps you can run through the Sears defice, I think it is
10 amps or so
> Sorry for the cross posting, wasn't sure where to put this. I am a
> woodworker and I have a table saw and a dust collector the saw is
> 220volts and the collector is 110volts. When I turn the saw on I want
> the dust colector to automaticaly come on.
> I don't think that it can be very difficult. can someone point me in the
> right direction to start figuring outhow to make one that is more flexable?
A current relay in the supply to the power tool can switch your 110v
when tool is powered. A small number of turns of thick wire on a
standard relay would do it, long as its contacts are suitably rated.
Pondering my navel here... I wonder if you couldn't drive a
low-voltage relay via a current transformer? That would save you
having to try to put a winding on a relay bobbin that you probably
can't get your fingers into.
| James E.Thompson, P.E. | mens |
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I love to cook with wine. Sometimes I even put it in the food.
How about a 110vac relay powered by one of the switched outlets ??
Regards ............... Rheilly Phoull
How are current relays rated and how do they work. The relay is an
on/off switch activated by the rise and fall of current. Are they rated
for switched and switching volts and current? Can I say I want a current
relay that that will sence the current in a 220 volt appliance, the max
current on the appliance will be 15 amps and I want the switch activated
at threshold of 2 amps. The appliacne being switched will have voltage
110 and max amps of 15. That is in effect what I want to do and if I can
buy that for $5 - $7 I can wire it up myself.
There is a device called a reed relay that is a simple set of contacts in a
glass bulb that is often used inside a specialised coil. The reed relay
itself is only a couple of dollars for both parts and they are often
The reed contact can be used in a coil of your own design, and a dozen turns
of one of the wires to your machine with about 15 amps should cause the reed
contacts to close. (Note I have only used this with DC but AC may work just
as well) The reed contacts can then be used to operate a larger relay that
can handle the current required for your dust collector.
As you can see I don't know for sure if this will operate with the Ac but
suspect it will. Be careful with your wiring. For the couple of bucks it
will cost to get a reed relay and the time to insert in a couple of turns of
the active supply line it might be a worthwhile experiment.
Hope this helps,
Problem is that the reed relay contacts are so light that they will
probably open and close 120 times a second, once for each half cycle
of the AC line. I don't know if they are rated for millions of
cycles, but this would be a good way to find out!
> Hope this helps,
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Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
"Jim Thompson" <inv...@invalid.invalid> wrote in message