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Notebook computer sized cells..... Where to buy ?
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felix
electronics forum beginner


Joined: 07 Jul 2005
Posts: 6

PostPosted: Thu Jul 07, 2005 6:14 pm    Post subject: Re: How can I make a rubber stopper at home? tia sal Reply with quote

Hi
If you want to duplicate an odd sized version of the standard rubber
stopper, I will guess that you cannot do it.

The rubber they use in these is resistant to many chemicals including
gasoline and acids, it ignores reasonably high temperatures, and does not
deteriorate, crack or harden with age. And best of all, the rubber
formulation they use has the right compression to make a reliable seal
without leaking,even when re-used many times.

Any commonly available material, including RTV , will not meet the above
criteria.


Of course, they probably aren't really rubber, but some concoction descended
from a barrel of Arab oil....

Felix

<sal@spp.net> wrote in message
news:Da8ze.36947$qm.4285@bignews5.bellsouth.net...
Quote:
Greetings all,

I would like to make my own rubber stoppers I have created a mold using
plaster of paris,
I have tried epoxy and fiberglass resin but these end up being to hard
does anyone know
what I can use to make softer rubber stoppers.

TIA SAL

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Clint Sharp
electronics forum addict


Joined: 05 May 2005
Posts: 56

PostPosted: Thu Jul 07, 2005 6:17 pm    Post subject: Re: How can I make a rubber stopper at home? tia sal Reply with quote

In message <Y%eze.28992$ro.16352@fed1read02>, Mark Fergerson
<nunya@biz.ness> writes
Quote:
sal@spp.net wrote:
Greetings all,
I would like to make my own rubber stoppers I have created a mold
using plaster of paris,
I have tried epoxy and fiberglass resin but these end up being to
hard does anyone know
what I can use to make softer rubber stoppers.
You could try and find a Dow Corning office, they sent me some 'samples'

(half a litre of each) of two, two part pourable 'rubber' compounds for
potting some temperature stabilised optical sensors I designed. The
stuff I got was probably too soft when cured for what you need but they
do have a wide range of compounds, speak to a tech rep and they'll be
able make suggestions if you explain what you need.

--
Clint Sharp
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John Fields
electronics forum Guru


Joined: 24 Mar 2005
Posts: 3260

PostPosted: Thu Jul 07, 2005 7:41 pm    Post subject: Re: How can I make a rubber stopper at home? tia sal Reply with quote

On Thu, 07 Jul 2005 11:16:51 GMT, <sal@spp.net> wrote:

Quote:
Greetings all,

I would like to make my own rubber stoppers I have created a mold using plaster of paris,
I have tried epoxy and fiberglass resin but these end up being to hard does anyone know
what I can use to make softer rubber stoppers.

---
Google for "cast urethane" without the quotes

--
John Fields
Professional Circuit Designer
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Gareth
electronics forum Guru


Joined: 25 Mar 2005
Posts: 750

PostPosted: Thu Jul 07, 2005 8:00 pm    Post subject: Re: How can I make a rubber stopper at home? tia sal Reply with quote

John Fields wrote:

Quote:
Google for "cast urethane" without the quotes

Probably better with the quotes; that way, Google will look for that
phrase. Otherwise, it will return all pages that contain the words
"urethane" and "cast" regardless of proximity (although their search
algorithn does appear to bring pages with the words in proximity to the
front).
--
Noah the searcher
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JANA
electronics forum Guru


Joined: 30 Apr 2005
Posts: 341

PostPosted: Sat Jul 09, 2005 8:35 am    Post subject: Re: How can I make a rubber stopper at home? tia sal Reply with quote

I think you are going to a lot of trouble for something that can be bought
for a few dollars!

--

JANA
_____


<sal@spp.net> wrote in message
news:Da8ze.36947$qm.4285@bignews5.bellsouth.net...
Greetings all,

I would like to make my own rubber stoppers I have created a mold using
plaster of paris,
I have tried epoxy and fiberglass resin but these end up being to hard does
anyone know
what I can use to make softer rubber stoppers.

TIA SAL
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Al
electronics forum beginner


Joined: 05 Jul 2005
Posts: 21

PostPosted: Sat Jul 09, 2005 12:29 pm    Post subject: Re: How can I make a rubber stopper at home? tia sal Reply with quote

In article <3j9pk2Fop5p9U4@uni-berlin.de>, "JANA" <jana@ca.inter.net>
wrote:

Quote:
I think you are going to a lot of trouble for something that can be bought
for a few dollars!

Lookup latex rubber molding compound on Google. Lottsa hits.

Al
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AJH
electronics forum beginner


Joined: 13 Jul 2005
Posts: 4

PostPosted: Wed Jul 13, 2005 8:57 am    Post subject: Re: Charger adaptor, Nokia charger plug to Palm Zire jack socket ??? Reply with quote

alan.webb@DogForAWalkblueyonder.co.uk wrote:
Quote:
On 8 Jul 2005 02:33:47 -0700, "AJH" <ajhbox-3@yahoo.co.uk> wrote:

Alan
It's actually the 9v charger. It takes a 9v pp3 battery but the
adapter that plugs in to the pda can be unplugged from the main body
and will accept the standard nokia charger. You'd have to buy the
whole thing as I doubt the adapter is available as a separate item.
The adapter for my Tosh steps up from Nokia's 3.5mm?(female) to the
slightly larger Toshiba male. From the look of the above link though
it may plug into the sync port for your Zire.

OK.
Actually the product you provided a link to is for the old-style
"Universal Palm COnnector" which is now not so universal.
My equivalent product would be this:
http://www.proporta.co.uk/F02/PPF02P05.php?t_id=635&t_mode=des
but the picture is wrong. Time to e-mail proporta again I think.
Thanks
The pictures are not always accurate. The item you linked to appears
different to the 9v adapter I have and so I would not expect it to
accept a Nokia lead.

I'm trying a different tack. Surely it must be possible to buy power
plugs and sockets for these devices (Nokia phones, Palm Zire 72) and
just make what I need?

So I want a socket that will take a Nokia charger cable and a plug that
will fit a Zire 72. Who supplies these? Anyone any ideas? Cross-posted
to sci.electronics.misc to see who knows.
The Nokia charger plug is roughly 3mm in dia and the Zire plug about
2mm, both hollow with +ve inside, -ve outside. Need socket for Nokia
and plug for Zire. Cannot find on rswww or maplin.
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Guest






PostPosted: Wed Jul 13, 2005 5:19 pm    Post subject: Re: Charger adaptor, Nokia charger plug to Palm Zire jack socket ??? Reply with quote

On 13 Jul 2005 03:57:05 -0700, "AJH" <ajhbox-3@yahoo.co.uk> wrote:


Quote:
My equivalent product would be this:
http://www.proporta.co.uk/F02/PPF02P05.php?t_id=635&t_mode=des
but the picture is wrong. Time to e-mail proporta again I think.
Thanks
The pictures are not always accurate. The item you linked to appears
different to the 9v adapter I have and so I would not expect it to
accept a Nokia lead.

I'm trying a different tack. Surely it must be possible to buy power
plugs and sockets for these devices (Nokia phones, Palm Zire 72) and
just make what I need?

So I want a socket that will take a Nokia charger cable and a plug that
will fit a Zire 72. Who supplies these? Anyone any ideas? Cross-posted
to sci.electronics.misc to see who knows.
The Nokia charger plug is roughly 3mm in dia and the Zire plug about
2mm, both hollow with +ve inside, -ve outside. Need socket for Nokia
and plug for Zire. Cannot find on rswww or maplin.
If you have no luck with the socket you could try what I ended up

doing with my Jabra charger when the pin broke.(Same size as Nokia)
Check out your local Poundshop for the emergency phone charger. The
adapters usually plug into a Nokia size socket which you can remove
and connect whatever plug you need for the Zire. It's not as tidy as
the other adapter but if it works for you....

HTH
Alan
Take DogForAWalk before replying by e-mail
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CWatters
electronics forum Guru


Joined: 02 May 2005
Posts: 494

PostPosted: Wed Jul 13, 2005 8:41 pm    Post subject: Re: twist sensitive resistor? Reply with quote

"Dave" <davidwhyte@comcast.net> wrote in message
news:1121284872.287617.300240@f14g2000cwb.googlegroups.com...
Quote:
I have science project that involves measuring a small torque, or
twisting force.

Is there a torque sensitive resistor I can buy? Or perhaps a torque
sensitive capacitor? I can integrate it into an existing circuit if I
can find one.

Wind a string around the object and connect the end to a strain gauge.
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Dave M
electronics forum beginner


Joined: 19 Jun 2005
Posts: 13

PostPosted: Wed Jul 13, 2005 11:48 pm    Post subject: Re: twist sensitive resistor? Reply with quote

On 13 Jul 2005 13:01:12 -0700, "Dave" <davidwhyte@comcast.net> wrote:

Quote:
I have science project that involves measuring a small torque, or
twisting force.

Is there a torque sensitive resistor I can buy? Or perhaps a torque
sensitive capacitor? I can integrate it into an existing circuit if I
can find one.

Thanks, Dave


Yup, sure thing!! It's called a strain gage. Omega, among others, make them.
Get some info about them at http://www.omega.com/Pressure/pdf/STRAIN_GAGES.pdf
==============

Dave M

Never take a laxative and a sleeping pill at the same time!!
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Yukio YANO
electronics forum addict


Joined: 27 May 2005
Posts: 66

PostPosted: Thu Jul 14, 2005 12:28 am    Post subject: Re: twist sensitive resistor? Reply with quote

Dave wrote:
Quote:
I have science project that involves measuring a small torque, or
twisting force.

Is there a torque sensitive resistor I can buy? Or perhaps a torque
sensitive capacitor? I can integrate it into an existing circuit if I
can find one.

Thanks, Dave

Use a Analog Meter Movement, and monitor the current required to

re-center the needle. I have seen this setup used to measure sub
milligram quantities

Yukio YANO
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scada
electronics forum addict


Joined: 14 Jul 2005
Posts: 54

PostPosted: Thu Jul 14, 2005 7:07 pm    Post subject: Re: twist sensitive resistor? Reply with quote

"Dave" <davidwhyte@comcast.net> wrote in message
news:1121284872.287617.300240@f14g2000cwb.googlegroups.com...
Quote:
I have science project that involves measuring a small torque, or
twisting force.

Is there a torque sensitive resistor I can buy? Or perhaps a torque
sensitive capacitor? I can integrate it into an existing circuit if I
can find one.

Thanks, Dave


Jameco sells a resistive flex device that has a range of around 10K-40K.
It's a long link, but here it is!
http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=150551
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AJH
electronics forum beginner


Joined: 13 Jul 2005
Posts: 4

PostPosted: Fri Jul 15, 2005 6:06 am    Post subject: Re: Pacific PVTV361 (tv/vcr combi from Asda) remote code Reply with quote

AJH wrote:
Quote:
AJH wrote:
As per original Message-ID:
1115389973.994583.123800@g14g2000cwa.googlegroups.com
I'm still looking for this code, or another option. Sky and Asda have
been no help. Is my only option a learning remote?

Incidentally I have a Palm Zire 72 and I can get hold of an IR monitor
and capture the IR codes being generated by the genuine remote, could I
look these up anywhere?

Alan "2 remotes".

Pacific PVTV361 (tv/vcr combi from Asda) remote code needed.
Anyone got this yet?
It's all gone quiet. Any ideas?

Sorry to harp on, but someone else must have this TV and also Sky (or
One4All...)
Thanks
Alan
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Fleetie
electronics forum beginner


Joined: 15 Jul 2005
Posts: 3

PostPosted: Fri Jul 15, 2005 7:47 pm    Post subject: Re: twist sensitive resistor? Reply with quote

"Yukio YANO" <yano@shaw.ca> wrote
Quote:
Use a Analog Meter Movement, and monitor the current required to re-center the needle. I have seen this setup used to measure
sub milligram quantities

When I was doing postgrad physics, I used a "microbalance" that used a
very similar principle. It routinely measured _microgram_ changes in mass
of a gas-adsorbing sample as it was exposed to varying pressures of
the gas to be adsorbed.

It is a very good method for measure miniscule mass (well, weight) changes.

May not be what the O.P. is looking for though, but I thought I'd post to
recommend this method for ultra-sensitive weight-change measurements.


Martin
--
M.A.Poyser Tel.: 07967 110890
Manchester, U.K. http://www.livejournal.com/userinfo.bml?user=fleetie
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David Mahon
electronics forum beginner


Joined: 16 Jul 2005
Posts: 3

PostPosted: Sat Jul 16, 2005 1:50 pm    Post subject: Re: UPS Reply with quote

In article <57c45bb48baced97e101537e48a3b933@localhost>,
No.Sp@m.here.please writes
Quote:


On Sat, 16 Jul 2005, David Mahon wrote:

In article <a7cc7a5ad0474fef6fcf08b81c546bb4@localhost>,
No.Sp@m.here.please writes

The highest temperature I've recorded on the UPS is 42. ISTR that when

Previously the highest I recorded was around 45, which it would reach at
about 6pm on a hot day (30 degrees plus).

Same here and no air con (just opening/closing windows).

For the past week, the temperature has got steadily higher and then
rocketed in the last 2 days.

My batteries will need relacing before too much longer as they're now
almost 7 years old. I'll be keeping a close eye on things when I do that!

supplying load the temperature of the UPS actually falls. Have you tried
refitting the old batteries to see if the symptoms remain?

No, don't have them anymore.

Oh well. Whilst it sounds like the replacement batteries caused the fault,
they could have caused damage to the rest of the unit. Maybe you could
raise an issue with the battery supplier?

Looking back through my mail archives (I ordered them online) I see I
replaced them in October last year. It's not like I just replaced them.

Hopefully the automatic shutdown is done to prevent further problems and
the temperature (70 degrees centigrade) is selected because of that.

What I don't know is if the shutdown of the unit also shuts down the
charging or if it just turns off the power outlets. If the charging
continues, the temperature may continue to rise (it certainly hadn't
fallen much, if at all (from 70 degrees C) in the three hours it had
been turned off before I found it, unplugged it, opened it, removed the
batteries and threw them into the garden.

When you do come to replace yours, look at:

http://www.upsbattery.co.uk/ (owned by the following)
http://www.mdsbattery.co.uk/

rather than directly at APC - who charge 2-3 times more for the same
cells in their RBC6 kit. This could still have happened even if I'd paid
the 120 pounds directly to APC.

Anyway, as this is getting a bit off topic here, and to perhaps get any
further input, I'll crosspost to sci.electronics.misc,alt.comp.hardware
and uk.comp.misc.
--
David Mahon
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Google

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