"Watson A.Name - \"Watt Sun, the Dark Remover\"" wrote:

"Ian Stirling" wrote in message
...
In sci.electronics.design Albert wrote:
Does anyone know how to measure or determine the wire size. I have
tons of motors, solenoids, and similar items. I need some #24 wire
and
some #30 for a coil, but have to be sure regarding the wire diameter
as it's a critical ap and the author of the article says 'don't
substitute'.

Micrometer.
Vernier caliper may also work.
Either under $30US.

I don't believe anyone uses vernier calipers anymore. I've got a Helios
dial caliper made a long time ago in Deutschland, but nowadays a caliper
with a LCD is probably a lot cheaper.

Ohhh... I assumed anyone serious would be using a Mitotuyo ? digital LCD
vernier caliper anyway. We certainly have one.


Graham

On Sat, 9 Apr 2005 12:57:50 +0100, the renowned John Woodgate
wrote:

I read in sci.electronics.design that "Watson A.Name - \"Watt Sun, the
Dark Remover\"" wrote (in
) about 'wire size question', on
Sat, 9 Apr 2005:

I don't believe anyone uses vernier calipers anymore. I've got a
Helios dial caliper made a long time ago in Deutschland, but nowadays a
caliper with a LCD is probably a lot cheaper.

In UK, you can get vernier calipers for around GBP1 (and mine check out
as quite sufficiently accurate). LCD calipers are about GBP35.

You can get low-end LCD calipers in the US for the equivalent of about
GPB8 plus tax. For GPB1 ($1.99) I think you'd get some stamped or
plastic item that would only be good to 0.01".


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

I read in sci.electronics.design that Spehro Pefhany
wrote (in
) about 'wire size
question', on Sat, 9 Apr 2005:

You can get low-end LCD calipers in the US for the equivalent of about
GPB8 plus tax. For GPB1 ($1.99) I think you'd get some stamped or
plastic item that would only be good to 0.01".

No, they are metal, and claim to measure to 0.001 inch, 0.02 mm. I've
checked mine against a good micrometer and it's as accurate as I can
read the vernier. YCCMV, of course.
--
Regards, John Woodgate, OOO - Own Opinions Only.
There are two sides to every question, except
'What is a Moebius strip?'
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

"John Woodgate" wrote in message
news
I read in sci.electronics.design that "Watson A.Name - \"Watt Sun, the
Dark Remover\"" wrote (in
) about 'wire size question', on
Sat, 9 Apr 2005:

I don't believe anyone uses vernier calipers anymore. I've got a
Helios dial caliper made a long time ago in Deutschland, but nowadays
a
caliper with a LCD is probably a lot cheaper.

In UK, you can get vernier calipers for around GBP1 (and mine check
out

For that cheap, you probably get plastic!
http://www.widgetsupply.com/page/WS/...-vernier/BET07

as quite sufficiently accurate). LCD calipers are about GBP35.

These look like a good deal on your side of the pond.
http://cgi.ebay.com/ws/eBayISAPI.dll...66&item=436984
3430&rd=1


--
Regards, John Woodgate, OOO - Own Opinions Only.
There are two sides to every question, except
'What is a Moebius strip?'
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

I read in sci.electronics.design that "Watson A.Name - \"Watt Sun, the
Dark Remover\"" wrote (in
) about 'wire size question', on
Sat, 9 Apr 2005:
These look like a good deal on your side of the pond.
http://cgi.ebay.com/ws/eBayISAPI.dll...66&item=436984
3430&rd=1

No longer there.
--
Regards, John Woodgate, OOO - Own Opinions Only.
There are two sides to every question, except
'What is a Moebius strip?'
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

wrote:
(snip)
pulling on soft-drawn copper wire is going to distort it
slightly so the measurement is going to be on the small
side. Snipping off ten or twenty short lengths, then
measuring the total width and dividing by the number of
lengths will be a bit better in accuracy.
(snip)

Really? Hmmmm ...

On Sat, 9 Apr 2005 16:47:43 +0100, John Woodgate
wrote:

I read in sci.electronics.design that "Watson A.Name - \"Watt Sun, the
Dark Remover\"" wrote (in
) about 'wire size question', on
Sat, 9 Apr 2005:
These look like a good deal on your side of the pond.
http://cgi.ebay.com/ws/eBayISAPI.dll...66&item=436984
3430&rd=1

No longer there.

The link was too long and got broken.

Much better to enclose all links in brackets, which will still work
right even if split/word-wrapped into multiple lines. Works with all
of the browsers I have used.

For example:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=20766&item=4369843 430&rd=1
for the item above, which works as Watson intended.

There are also options like tinyurl, but some do not trust that.

Happy trails,
Gary (net.yogi.bear)
--
At the 51st percentile of ursine intelligence

Gary D. Schwartz, Needham, MA, USA
Please reply to: garyDOTschwartzATpoboxDOTcom

"Pooh Bear" wrote in message
...
"Watson A.Name - \"Watt Sun, the Dark Remover\"" wrote:

Albert wrote in message
...
Does anyone know how to measure or determine the wire size. I have
tons of motors, solenoids, and similar items. I need some #24 wire
and
some #30 for a coil, but have to be sure regarding the wire
diameter
as it's a critical ap and the author of the article says 'don't
substitute'.

I know I can weigh it, provided it's not on a spool or motor
winding
already.

My local electrical shop has a wire gauge, but it stops at 18
gauge.

A microscope might work, but ones that have calibrated distance
measuring on the eyepiece are expensive.

Perhaps a milliohm meter might be able to measure the difference
in
resistance of a foot of it or so, but that's hardly a standard
item
either.

Any suggestions?

I use either a dial calipers or a micrometer. But then the
insulation
can make it sizeably larger than the value given in the wire tables.
The wire tables have a column which gives 'ohms per 1000 ft' which
is
just another way of saying milliohms per foot. So if you measure
ten
feet of 30 AWG it should measure 1.04 ohms. My cheap meter test
leads
are something like .4 ohms, so it's really difficult to get any
accuracy
at that low a resistance. I have a Leeds Northrup wheatstone
bridge,
and it's not very good either at that low a resistance. So I put
the
wire or whatever on a power supply and crank up the current to a
quarter
amp, and then measure the V drop and calculate the resistance from
that.

I use that trick too. The only sensible way to measure a coil's
winding R.

Long as it doesn't start glowing red. ;-)

Probably not such a good idea for measuring the series R of inductors.
Unless you run a Hi Power tape demagnetizer over it when you're done..

BTW, speaking of tapes.. I read that the company that made Irish and
Ampex tape has closed. Looks like everyone has been going to CD-Rs.

http://members4.boardhost.com/culturama/msg/3217.html

Graham

"Pooh Bear" wrote in message
...


"Watson A.Name - \"Watt Sun, the Dark Remover\"" wrote:

"Ian Stirling" wrote in message
...
In sci.electronics.design Albert wrote:
Does anyone know how to measure or determine the wire size. I
have
tons of motors, solenoids, and similar items. I need some #24
wire
and
some #30 for a coil, but have to be sure regarding the wire
diameter
as it's a critical ap and the author of the article says 'don't
substitute'.

Micrometer.
Vernier caliper may also work.
Either under $30US.

I don't believe anyone uses vernier calipers anymore. I've got a
Helios
dial caliper made a long time ago in Deutschland, but nowadays a
caliper
with a LCD is probably a lot cheaper.

Ohhh... I assumed anyone serious would be using a Mitotuyo ? digital
LCD
vernier caliper anyway. We certainly have one.

I'm trying to figure out why they would be called vernier when they have
a LCD display.

Graham

"Spehro Pefhany" wrote in message
news
On Sat, 9 Apr 2005 12:57:50 +0100, the renowned John Woodgate
wrote:

I read in sci.electronics.design that "Watson A.Name - \"Watt Sun,
the
Dark Remover\"" wrote (in
) about 'wire size question', on
Sat, 9 Apr 2005:

I don't believe anyone uses vernier calipers anymore. I've got a
Helios dial caliper made a long time ago in Deutschland, but
nowadays a
caliper with a LCD is probably a lot cheaper.

In UK, you can get vernier calipers for around GBP1 (and mine check
out
as quite sufficiently accurate). LCD calipers are about GBP35.

You can get low-end LCD calipers in the US for the equivalent of about
GPB8 plus tax. For GPB1 ($1.99) I think you'd get some stamped or
plastic item that would only be good to 0.01".

Zackly. The ones I've seen in stores don't go down to a thousandth.
Not to mention the jaws probably wear and/or get dimpled by the sharp
edges of objects, ruining the accuracy.

But at two bucks apiece, you just treat them as disposable and discard
them at the end of the day. ;-)

Unless, of course, you're a plastic surgeon using them to measure the
results of your liposuction machine. ;-))

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the
reward"
Info for manufacturers:
http://www.trexon.com
Embedded software/hardware/analog Info for designers:
http://www.speff.com