Unkown micrometer manufacturer

[Chris Kaminski]

On Chris Kaminski Said:

On Grindstone Cowboy Said:

…so may have missed somone else pointing this out, but the German State Crown looks a decent match to me, including the orb and cross on the top…

 

Found at https://en.wikipedia.org/wiki/German_State_Crown

Rob

yes, I have pointed in the direction of German State Crown

(it is indeed orb and cross that makes it specific)

but I don’t think it brings forward our search for specific micrometer manufacturer…

Not sure the German State Crown is that different from the others.   This is Britain’s St Edwards Crown, made in 1661 for Charles II’s coronation:

Crowns existed before nation states.  Back then Europe was ruled by a relatively small number of families who intermarried all the time.  Crowns are more likely to be similar than not.   Charles II was a Stuart, i.e. a Scot.

British crowns feature the fleur de lyse which comes from our early French royal connections.   Our current royal family is distinctly German, and Kaiser Wilhelm, he of the 1918 bayonet crown, was Queen Victoria’s eldest grandchild.   Not surprising crowns are alike.

Doesn’t help with the micrometer though.  I think spade man, OSKO and the entrenching tools are better leads.

Dave

 

[Michael GilliganParticipant @michaelgilligan61133]

One step nearer to comprehension ?

http://sharky-fourbees.blogspot.com/2019/02/german-klappspaten-folding-shovel-bgs.html

MichaelG.

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Ref. __ https://www.idealspaten.de/en/company/company-history

 

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[peak4Participant @peak4]

I had this English translation of a German Wiki page open in another tab by coincidence, whilst rooting through various NATO stock number searches.

https://de-m-wikipedia-org.translate.goog/wiki/Idealspaten?_x_tr_sl=de&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=sc

I did try running various links on that page through Google Translate, but didn’t find any reference to much other than spades.

Bill

[Michael GilliganParticipant @michaelgilligan61133]

For info.

I have just sent an eMail to idealspaten

MichaelG.

[peak4Participant @peak4]

The same seller (I think) has another small one up for grabs by the looks of it
https://www.ebay.co.uk/itm/186895494405

Bill

[Michael GilliganParticipant @michaelgilligan61133]

Probably common knowledge … but just in case

This is one of the more accessible sites listing Nato Stock Numbers

https://www.iso-parts.com/Public/Search_NSN_Details.aspx?NSN=5120-12-121-1532

MichaelG.

[SillyOldDuffer]

On SillyOldDuffer Said:try it again, but without “trade mark”  text

 

My guess is the collection are all accurate in the ±0.003″ region, with many good to ±0.001″, and a few even better.   For ordinary working ±0.003″ accuracy is often ‘good enough’, but not for making exchangeable parts, and unacceptable in a tool-room!

 

Your guess is wrong.

1: You do not know my back ground

2: Nor do you know what metrology tools I have

3: Here is clue Allan Brown inspection grade NAMAS calibrated gauges plus tungsten carbide Grade 1 English make. plus other measuring instruments.

 

All but 2 measure to less the .001 accuracy across the 1 inch or the 0.01 across 25mm.

 

The ones that are out are the OSKO 25-50 and a new Chinese one that was purchased to check its accuracy both are metric and are considered scrap.

The error in both is 0 .0004 mm (0.00002 inch) over the pitch of one thread. Which = 0.02mm over the full reading range of 25mm.

 

 

 

 

[Tomk]

On Tomk Said:

On SillyOldDuffer Said:try it again, but without “trade mark”  tex

[Chorus ] … Oh no he didn’t !

MichaelG.

 

 

 

[Michael GilliganParticipant @michaelgilligan61133]

Preliminary response from idealspaten

.

Good afternoon

The OSKO company means nothing to me. The spade man is definitely the Idealspaten logo. It may well be that this device was used in our spade production to measure the material thickness. I’ll ask my colleague from production next week.

.

 

MichaelG.

[Chris KaminskiParticipant @chriskaminski64716]

just to throw another spanner (or do I mean spade 🙂 …) into discussion

here is the back of (produced in 1945) German radio

[Tomk]

On Tomk Said:

On SillyOldDuffer Said:try it again, but without “trade mark”  text

 

My guess is the collection are all accurate in the ±0.003″ region, with many good to ±0.001″, and a few even better.   For ordinary working ±0.003″ accuracy is often ‘good enough’, but not for making exchangeable parts, and unacceptable in a tool-room!

 

Your guess is wrong.

1: You do not know my back ground

2: Nor do you know what metrology tools I have

3: Here is clue Allan Brown inspection grade NAMAS calibrated gauges plus tungsten carbide Grade 1 English make. plus other measuring instruments.

 

All but 2 measure to less the .001 accuracy across the 1 inch or the 0.01 across 25mm.

 

The ones that are out are the OSKO 25-50 and a new Chinese one that was purchased to check its accuracy both are metric and are considered scrap.

The error in both is 0 .0004 mm (0.00002 inch) over the pitch of one thread. Which = 0.02mm over the full reading range of 25mm.

 

 

 

 

No need to take offence.  I said it was a guess and you told us nothing about your background.  Or that the micrometers had been tested.  Not many collectors have the wherewithal to measure micrometers properly.

Can you publish the data please? Must have been a lot of work and I don’t think anyone has analysed a group of second-hand micrometers before.  It would make an interesting magazine article.  How the measurements were made and what you found etc.  The techniques used are interesting and I enjoy lots of lovely graphs plotting accuracy and precision.

Accuracy that good over that number of instruments is surprising.  Where you able to test them before purchase?  I assumed they were collected randomly,  warts and all, history unknown.

Dave

[Michael GilliganParticipant @michaelgilligan61133]

[ The plot thickens ]

Here, verbatim, is the follow-up from my contact at IDEAL

I have shown the picture to three colleagues (who have been with Idealspaten for many years), but we cannot understand why our logo is shown on the packaging of the micrometer.

 

 

Mit freundlichen Grüßen

MichaelG.

[Chris KaminskiParticipant @chriskaminski64716]

Interesting history they don’t mention on their web page 🙂

“…In 1939 the „Teplitzer Eisenwerke, Schaufel- und Zeugwaren-Fabrik AG“, formerly owned by a Jewish family, in the Czech Republic was taken over…”

or

“…Several hundred prisoners of war and foreign workers , mainly from Poland and Russia , were employed. From 1941 onwards, they were housed in a fenced barracks camp, guarded by a Wehrmacht unit. In 1943, another camp was set up on the company premises. Conditions in the camp included hunger and mistreatment. Several forced labourers lost their lives…”

 

[peak4Participant @peak4]

No wiser on the actual manufacturer, but my 0-½” one arrived this morning.
It doesn’t feel cheap and nasty by any means, but isn’t quite up to the quality of my M&W or Shardlow ones of the same size.
My plain anvil ½” M&W and Shardlow have the tenths vernier, but this Osko, like my ball anvil ½” M&W, just have the main thou scale.
The locking collar is a bit notchy, leading to occasional slight binding of the spindle, depending on which way you twist it, but a bit of de-burring might cure that.
It moves smoothly otherwise and seems consistent, when checked with the range of gauge blocks usually supplied as a set for checking micrometers.
The small knob at the end is a smoothly operating ratchet.

Bill

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