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vibration detector

J

Jimlhebert

Jan 1, 1970
0
Need a circuit diagrame for a simple vibration detector that will sense when my
table saw is on and operate a small relay.
 
C

CFoley1064

Jan 1, 1970
0
Subject: vibration detector
From: [email protected] (Jimlhebert)
Date: 2/22/2004 8:08 PM Central Standard Time
Message-id: <[email protected]>

Need a circuit diagrame for a simple vibration detector that will sense when
my
table saw is on and operate a small relay.

If you've got a 120VAC table saw, why not just put a 120VAC relay coil across
the motor wires?

Good luck
Chris
 
J

John Popelish

Jan 1, 1970
0
Jimlhebert said:
Need a circuit diagrame for a simple vibration detector that will sense when my
table saw is on and operate a small relay.

I would make a current relay in an extension cord that pulls in when
the load plugged into the cord is drawing current. Then plug the saw
into that extension cord. I once made one of these to turn the
furnace blower on when the window air conditioning compressor turned
on.
 
J

Jamie

Jan 1, 1970
0
well i think if you have it powered up you have power that you can use
to trip a relay, hook into the switch!.
or are you talking about the spin down ?
there are a couple of ways..
one is to place a hall effect or some optical sensor on the shaft ,
or place a round magnet around the shaft and use the spinning effects
to push onto a steel switch.
the other ways is to make a circuit that monitors the regeneration
of the motor as it spins down.. motors will act like generator when you
disconnect power , while waiting for it to spin down i will generate
AC.
so if you were to make a low voltage monitor device that will also
handle the line voltage when on you have a good indication of when the
blade stops spinning.
using a simple OP-Amp protecting the inputs via high value resisters
into a zener you can drive a voltage comparator..
etc...
if interested i guess you could ask more about it.
 
J

JeffM

Jan 1, 1970
0
Need..a simple vibration detector
make a current relay in an extension cord
that pulls in when the load plugged into the cord is drawing current.
John Popelish

Popelish has it right: 1st dump the vibration idea.

This question has been asked here before, in almost identical words.
(Google is your friend; learn to use it.)
http://groups.google.com/groups?num...s.*+table-saw+switch+relay&btnG=Google+Search

Jim Thompson came up with a specific (and excellent) solution:
http://groups.google.com/groups?hl=...=lang_en&ie=UTF-8&safe=off&scoring=d&filter=0

Popelish's extension-cord-assembly idea is the final touch.
 
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