I've got a problem for you ;-)

[Jeff]

"Jim Thompson" <thegreatone@example.com> wrote in message
news:q4ld10lgr9okc2333ruh9nc55ccflg9n7o@4ax.com...

I have a sandstone (American aboriginal) Indian carving with a clock
and a bi-metal (rotating pointer) thermometer in it.

I was able to find a replacement battery-powered clock mechanism.

But I've had no luck with replacing the bi-metal thermometer.

It's completely hosed... indicates 0 to +65 (°F) when the real range
was 40 to 65 °F.

You can't cut some of the bi-metal strip out, so it looses some sensitivity,
or put the temper back into the metal by heating to it's annealing
temperature?

I was pondering an electronic replacement with some kind of
low-powered indicator (such as the fuel gauges in old GM products).

Any ideas... design, procurement, etc.?

Thanks!

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

[Bob]

I am holding in my hand a Radio Schlock clock that has a stopwatch, compass,
and thermometer and is set up as a key fob. I won it at a hamfest last
summer and the thermometer (about 9/16" in diameter) covers from -20F to
+120F in about 270 degrees of rotation of the pointer. It's their part
number 63-1126 and I suspect it sells for around $10 or less. Maybe you can
extract the thermometer and modify it or at the least, remove the bimetal.
Or find a different product that suits the application better.

In this item, the bimetal and pointer are glued to the back of the crystal
with a spot of paint to cover the little bimetal coil. The dial is fixed
and behind the red pointer.

Bob

 

[AJScott]

In article <q4ld10lgr9okc2333ruh9nc55ccflg9n7o@4ax.com>,
Jim Thompson <thegreatone@example.com> wrote:

I have a sandstone (American aboriginal) Indian carving with a clock
and a bi-metal (rotating pointer) thermometer in it.

I was able to find a replacement battery-powered clock mechanism.

But I've had no luck with replacing the bi-metal thermometer.

It's completely hosed... indicates 0 to +65 (°F) when the real range
was 40 to 65 °F.

I was pondering an electronic replacement with some kind of
low-powered indicator (such as the fuel gauges in old GM products).

Any ideas... design, procurement, etc.?

Thanks!

...Jim Thompson

I'd say screw it and go with the statue of Buddha with a clock in its
belly. Hear told, kitchy is chic again.

AJS

 

[Active8]

On Tue, 27 Jan 2004 22:44:03 GMT, Spehro Pefhany <Spehro Pefhany
<speffSNIP@interlogDOTyou.knowwhat>> said...

On Tue, 27 Jan 2004 15:14:17 -0700, the renowned Jim Thompson
thegreatone@example.com> wrote:

I have a 6" pointer that indicates temperature over a 270° arc for
-40°F to +120°F

This is carved-in-stone out on the patio upon which you and your wife
have set and is under the jurisdiction of the management ;-)

Say no more. Hmm, okay given that, check out #5310 & 5353 here:
http://www.branom.com/COMPANIES/taylor.html

Thus "hack" jobs are impermissible.

I vaguely remember a thirty-year-ago project that used some kind of
two-coil indicator (Stewart-Warner).

Stewart-Warner is *the* keyword for the raw movements themselves,
AFAIUI.

Drivers for this type of very linear indicator:

http://www.semiconductors.philips.com/acrobat/applicationnotes/AN1761.pdf
http://www.semiconductors.philips.com/acrobat/datasheets/SA5775A_3.pdf
http://moon.feld.cvut.cz/hw/philips/acrobat/5027.pdf
http://cache.national.com/ds/LM/LM1819.pdf (discontinued)
http://www.nteinc.com/specs/1600to1699/pdf/nte1670.pdf
http://www.onsemi.com/pub/Collateral/CS8190-D.PDF
http://www.onsemi.com/pub/Collateral/CS4121-D.PDF

Possible source for a movement (but looks more like 240° than 270°)
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33679&item=2456769547

These don't move when un-powered.

What I had in mind is powering up every 15 minutes, apply power to the
coils to set the current temperature, then sleep again for 15 minutes
(or whatever is necessary).

Temperature measurement has been a good chunk of my career... that's

I'll wager even more of mine, but this is about as easy as they come!

That's a lot of links, but if you want a little challenge, would
muscle wires provide enough repeatable accuracy? Wire wrapped
around something circular contracts (with applied current) and
pulls on the pointer at a point which gives the right amount of
deflection. Figure if an inch of wire contracts by X then 10"
wrapped around something (to save space) will contract 10X and if
the connection point (in relation to the pivot point) scribes a 10X
arc to give you 270 deg, you got it.

Add a human hair powered humidity pointer if you like.

Oh yeah. Phoenix. Dry as a popcorn fart.

the easy part... getting the indicator mechanism will be a wee bit
more difficult.

Or maybe there's a bi-metal indicator out there that has adjustable
end-points ??



...Jim Thompson

Best regards,
Spehro Pefhany

--
Best Regards,
Mike

 

[Tom Del Rosso]

In news:q4ld10lgr9okc2333ruh9nc55ccflg9n7o@4ax.com,
Jim Thompson typed:

Any ideas... design, procurement, etc.?

You should ask about the bimetal movement in rec.crafts.metalworking.


--
-Reply in group, but if emailing add 2 more zeros-
-and remove the obvious-

 

[Jim Thompson]

On Tue, 27 Jan 2004 20:16:04 -0500, Chuck Harris <cfharris@erols.com>
wrote:

Hi Jim,

Although it is rare for a bimetal that isn't corroded to fail,
you can get replacements for many different types from:

http://www.slarose.com

[snip]

They came back with......

"Sorry cannot supply

Thank you
SLR"

Thanks, anyway, for the pointer.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

[Spehro Pefhany]

On Wed, 28 Jan 2004 09:10:18 -0700, the renowned Jim Thompson
<thegreatone@example.com> wrote:

On Tue, 27 Jan 2004 20:16:04 -0500, Chuck Harris <cfharris@erols.com
wrote:

Hi Jim,

Although it is rare for a bimetal that isn't corroded to fail,
you can get replacements for many different types from:

http://www.slarose.com

[snip]

They came back with......

"Sorry cannot supply

Thank you
SLR"

Have you checked out the 6" Taylor stuff yet? They may even be the OEM
supplier.

Thanks, anyway, for the pointer.

Very funny. ;-)

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

 

[Chuck Harris]

Hi Jim,

Bummer!

LaRose used to have a variety of thermometers and barometers, etc.
that were used in clocks and "weather stations". They are more of
a watch parts house, however.

Another possibility, is just about any lawn/garden center. They all
have yard thermometers, and the range of the ones made by taylor are
270 degrees rotation and -60 to +120F. I know the 120F is a little
on the low side for Arizona, but maybe you can make do by shifting
the scale up a bit.

-Chuck Harris

Jim Thompson wrote:

On Tue, 27 Jan 2004 20:16:04 -0500, Chuck Harris <cfharris@erols.com
wrote:


Hi Jim,

Although it is rare for a bimetal that isn't corroded to fail,
you can get replacements for many different types from:

http://www.slarose.com


[snip]

They came back with......

"Sorry cannot supply

Thank you
SLR"

Thanks, anyway, for the pointer.

...Jim Thompson

 

[Jim Thompson]

On Wed, 28 Jan 2004 14:12:29 -0500, Chuck Harris <cfharris@erols.com>
wrote:

Hi Jim,

Bummer!

LaRose used to have a variety of thermometers and barometers, etc.
that were used in clocks and "weather stations". They are more of
a watch parts house, however.

Another possibility, is just about any lawn/garden center. They all
have yard thermometers, and the range of the ones made by taylor are
270 degrees rotation and -60 to +120F. I know the 120F is a little
on the low side for Arizona, but maybe you can make do by shifting
the scale up a bit.

-Chuck Harris

[snip]

I'm sure my best bet is to disassemble an existing unit and install in
my stone-work.

But the electronic indicator approach intrigues me ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

[Sir Charles W. Shults III]

Jim, I just got back from the Dollar General store here, and they sell a
"Koch thermometer" which an 8 inch long pointer and ranges from -60 to 120
F, with 270 degrees of that being -40 to 120 F. It cost under $5 and the
bimetallic portion is in a small round device that measures 1.5 inches
across.
I'm betting that this gem will do exactly what you want.

Cheers!

Chip Shults

 

[Jim Thompson]

On Wed, 28 Jan 2004 22:32:06 GMT, "Sir Charles W. Shults III"
<nowayjose@planetpluto.com> wrote:

Jim, I just got back from the Dollar General store here, and they sell a
"Koch thermometer" which an 8 inch long pointer and ranges from -60 to 120
F, with 270 degrees of that being -40 to 120 F. It cost under $5 and the
bimetallic portion is in a small round device that measures 1.5 inches
across.
I'm betting that this gem will do exactly what you want.

Cheers!

Chip Shults

I found a similarly spanned Taylor on the web. I'll go shopping
tonight and see what I can find.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

[Martin Riddle]

Ha, you asked for ideas. Im not responsible for implemtation.

"Jim Thompson" <thegreatone@example.com> wrote in message news:b0je10p7vqavcqgnle51s35pkedq6olfmu@4ax.com...

On Wed, 28 Jan 2004 05:19:02 GMT, "Martin Riddle"
martinriddle@hotmail.com> wrote:

Some one does make a psueado LCD meter that has an analog look to it. Comes in colors too.
But I can find it at the moment.

I would stick with the mechanical style tho. Maybe check process control oriented distributors.
Or even photo equipment suppliers (darkroom). You might find a suitable replacement that way.
Even all stainless.

Cheers

[snip]

How ya going to do that in the front of a stone carving?

I need a rotating pointer.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

[DarkMatter]

On Tue, 27 Jan 2004 22:44:36 -0700, Jim Thompson
<thegreatone@example.com> Gave us:

I need a rotating pointer.

He wasn't talking about LCD numerals. He was talking about an LCD
display that emulates a rotating pointer, if I got that meaning right.
round