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Zehntausendste Curta Type 2

 
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murff



Joined: 27 Oct 2009
Posts: 511
Location: Switzerland

PostPosted: Tue Jan 05, 2016 3:33 pm    Post subject: Zehntausendste Curta Type 2 Reply with quote

Zehntausendste Curta Type 2



Institute of Geodesy and Photogrammetry ETH Zurich 1957




First Curta this year - and so first cleaning and restauration job

Very Happy
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Pete



Joined: 04 Mar 2010
Posts: 200
Location: Great White North

PostPosted: Wed Jan 06, 2016 3:13 pm    Post subject: Reply with quote

Nice catch! So this is one of the very late black-body Type 2 machines - I guess regular (matte) metal canister, usual lettering, all metal - anything unusual about this particular example except for the SN?
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murff



Joined: 27 Oct 2009
Posts: 511
Location: Switzerland

PostPosted: Wed Jan 06, 2016 3:30 pm    Post subject: Reply with quote

The special thing about this Curta is that it was used very often and rough (in the field) - the metal canister looks like a cow has eaten it. The main shaft is bent and the zero positioner disc has lost most of the teeth so you can turn the crank anti clock wise... And the Curta is really dirty inside and outside. It only works in sticky way.
With only some basic tools (none of the special Contina tools) it will be a challenge to make this Curta fit again!

The work is in progress, now...

Update will follow
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murff



Joined: 27 Oct 2009
Posts: 511
Location: Switzerland

PostPosted: Thu Jan 07, 2016 8:54 am    Post subject: Reply with quote

So a first round is done...
- the whole Curta is deeply cleaned and lubricated
- the bent main shaft was adjusted to straight so the crank is in a right angle now
- the zero positioner disc was replaced
- a bent axle of a setting knob was replaced
Maybe I'll try to replace the Clearing lever which is bent and not able to latching correctly.

Here are some pictures of this successful operation (and a good lesson in Curta mechanics...):

Curta Type 2 - die Zehntausendste



[ Removing the top of the Curta ]
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Pete



Joined: 04 Mar 2010
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Location: Great White North

PostPosted: Thu Jan 07, 2016 4:20 pm    Post subject: Reply with quote

You're a brave man taking those things to bits, pal. Best of luck
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murff



Joined: 27 Oct 2009
Posts: 511
Location: Switzerland

PostPosted: Fri Mar 04, 2016 4:34 pm    Post subject: Reply with quote

update

In addition to my repair adventure I replaced the clearing lever on the "Zehntausendste" and on a newly repaired Curta Type 2 (an early grey with triple group of the red sliders) . In both cases the rings were not broken but they not correctly snapped into the working position.



The challenge is that you have to rivet with the correct force so that the lever is still moveable...


( more pictures on my site )

In another try I replaced the red brittle color of the subtract stripe at the crank. I used FIMO - a plastic modeling compound which can be hardened in a oven.


Subtract stripe - 1) blank metal 2) red, new replaced with FIMO 3) original red, brittle color
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2010*smiths



Joined: 18 Apr 2013
Posts: 47
Location: Bogota, Colombia

PostPosted: Fri Mar 04, 2016 10:20 pm    Post subject: Reply with quote

Fascinating; great work and thanks for the update.
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