Moore & Wright disaster

[Ian PParticipant @ianp]

Les

The charger that came with my micrometer is a sealed (13A plug type) transformer unit so would definitely not be easy to alter its constant current output. The other complication is that the charge connector is a proprietary design and moulded on the end of the cable. The cable and connector though could be salvaged and put on a more suitable charger.

Ian

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Neil Wyatt on 31/07/2014 18:35:19:

Hi Paul,

Given the vintage of the calipers the original cells are probably NiCad rather than NiMH.

.

Neil,

The link that I posted earlier gave me some confidence that NiMH would be O.K.

… but I may have misinterpreted

[if so, then even with a new charger, what I suggested looks a good bet]

MichaelG.

 

[quote]

Posted by Michael Gilligan on 30/07/2014 23:58:08:

Sit down and breathe deeply … then look here

 

 

Edited By Michael Gilligan on 31/07/2014 20:57:11

[Les Jones 1Participant @lesjones1]

I have just had a look on Ebay for "nimh button cells" I found this item which might do the job if you don't mind modifying things. You would need two as these are only 3 cells. Googling the part number I found another seller that lists the dimensions as 21mm x 45mm x 11mm. This would suggest that the cells are very close to the size of your original cells.

Les.

[Ian PParticipant @ianp]

Les

That's a good find!

I have just measure the original NiCad and its larger than I remembered at 25.5 diameter x 26.5 Long.

I am now thinking of buying 2 of those packs to get the four cells needed, if anyone else is doing the same we should get together and make a third pack with the spare cells as its a waste otherwise. (PM's in order here)

Ian

[Les Jones 1Participant @lesjones1]

Hi Ian,
I misread the dimensions. They are in cm not mm so I do not think they are correct. I would hold on until we can confirm the dimensions.

Les.

[Les Jones 1Participant @lesjones1]

Hi Ian,
From your dimensions your pack looks like a single stack of 4 cells. The one Paul describes is 2 packs of 2 cells. Two of these from Farnell might do but they are about 0.4 mm thicker than the ones Paul has.

Ignore this post these are the ones Michael found earlier.

Les.

Edited By Les Jones 1 on 31/07/2014 21:51:06

[Michael GilliganParticipant @michaelgilligan61133]

Les,

Deja Vu

MichaelG.

.

Edit: Cheers, Les

Edited By Michael Gilligan on 31/07/2014 21:53:40

[Ian PParticipant @ianp]

The width and height measurements on the Farnell site are a bit confusing. It was a battery I discounted because of the 26mm dimension although I now think that it might be it includes the PCB pins.

If the diameter is OK I think the extra 0.8mm height could be catered for so I will investigate.

Ian

[Michael GilliganParticipant @michaelgilligan61133]

Ian,

As I mentioned to Paul, earlier … the DataSheet [linked on the Farnell page] shows the detailed dimensions of the individual cell.

MichaelG.

Edited By Michael Gilligan on 31/07/2014 22:13:45

[Paul TummersParticipant @paultummers57940]

Thanks to all of you for the overwhelming responses and help!

I think, there is enough room for the 0,8mm extra hight and the diameter of 25,2 mm was measured from the dead cell including crimp foil I took out of the micrometer, think, even 26 or 27 mm will fit in the battery compartment.

Unfortunately Farnell does not accept Paypal, so I will have to look ok Ebay to get a 3+1 stack to get the needed 4,8 Volts. What I know from experience is that not only there voltage must match, also the amount of AH must be in line to avoid an explosion of a cell. I had this problem some years a goo with a rechargeable flashlight and it exploded right in my hands when I switched it on and it did cost me over 75% of the use of my right thumb, stiff and no feel in it anymore.

[Michael GilliganParticipant @michaelgilligan61133]

Slightly off-topic, but you guys with Classic digital micrometers might apprciate these.

[of course they are only "digital" in the human interface]

MichaelG.

[OuBallieParticipant @ouballie]

Stub Mandrel Neil,

Snap!

Had this happen after cleaning using molasses then paraffin. As yours, a gentle 'ping' and it fell apart.

Snap again!

My welding would do far more damage than fix.

Geoff – Feeling so much better after 40 winks in armchair. What can I say!

[Peter TuckerParticipant @petertucker86088]

Hi Geoff,

Don't even think of welding that spring. I had a similar break and fashioned a replacement from some hi-tensile steel pipe which, when hardened, proved to be perfectly adequate.

Good luck.

Peter.

[Les Jones 1Participant @lesjones1]

Hi Peter,
I think Geoff is just getting the thread back to the original topic of the broken spring. It was Neil that had this problem at the start of the thread. (Note I am not complaining about the thread meandering off topic. It can make the thread more interesting.)

Les.

[OuBallieParticipant @ouballie]

Fear not Peter, I have absolutely no intention of welding it, not even with TIG.

The parts are with the other tools that went 'ping' as well.

What piping are you refereing to?

I don't need the caliper, but it would be my first attempt at making a spring of this shape.

Geoff – Need to sort out the WB on the HV20.

[Paul TummersParticipant @paultummers57940]

I was able to buy 2 of the 2,4V Varta 2XV250H cells! No answer from Farnell, so that will be a company not to do business with in the future.

[Paul TummersParticipant @paultummers57940]

When you have a piece of high tensile steel pipe that matches the dimensions of that spring, I do not see any difficulty in making one, before heat treating it can be turned, filed and drilled without any problems.

Only thing is, make sure, there are no scratches left in the inner/outer surface because that is asking for breaking, I got some experience with this in gunlock springs.

[Russell EberhardtParticipant @russelleberhardt48058]

Posted by Paul Tummers on 02/08/2014 10:40:08:

No answer from Farnell, so that will be a company not to do business with in the future.

That's strange. I have ordered from their website both for UK and French delivery with no problems.

Russell.

[Michael GilliganParticipant @michaelgilligan61133]

Good result, Paul

Sorry to hear about Farnell

… Where did you buy ?

MichaelG.

[Paul TummersParticipant @paultummers57940]

Yes, I asked a simple question about payment which they would have been able to answer very easily but when I get no answer within a reasonable time, I will not further bothering them. There are more companies to do business with in Europe.

[Paul TummersParticipant @paultummers57940]

I bought them on Ebay, the name of the shop is batterieplus, a German shop.

[Kevin FParticipant @kevinf]

by Michael Gilligan on 31/07/2014 22:50:06:

Slightly off-topic, but you guys with Classic digital micrometers might apprciate these.

[of course they are only "digital" in the human interface]

MichaelG.

I have a later type of counter micrometer

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Paul Tummers on 02/08/2014 11:05:55:

I bought them on Ebay, the name of the shop is batterieplus, a German shop.

.

Thanks Paul

Useful to know

MichaelG.

[Peter TuckerParticipant @petertucker86088]

Hi Geoff,

I have some scraps (all my material is scrap) of galvanised hi-tensile steel tube (looks similar to but thinner wall than galv. water pipe) salvaged from when I was building plastic clad green houses. I realise this material may not be readily available to many people but is worth wile looking out for to use in some small demanding jobs.

My apologies to all for off topic posts.

Peter.

[Paul TummersParticipant @paultummers57940]

Posted by Kevin Fenrich on 02/08/2014 15:39:53:

by Michael Gilligan on 31/07/2014 22:50:06:

Slightly off-topic, but you guys with Classic digital micrometers might apprciate these.

[of course they are only "digital" in the human interface]

MichaelG.

I have a later type of counter micrometer

I have one of those, they are very good tools and accurate. What I like especially is that the Moore & Wright has spring tension which improves accuracy in taking measurement very much.

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