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General => General Chat => Topic started by: Artlav on December 24, 2014, 09:00:10 pm

Title: Would Dave be interested in a mechanical calculator?
Post by: Artlav on December 24, 2014, 09:00:10 pm
Would Dave be interested in a fully mechanical calculator?

It can add, subtract, multiply and divide.
A fine example of an era before the electronics came around.

I have no clue what to do with it, and might have an occasion to get it to Australia around the new year.

(http://i.imgur.com/gK6rbV7.jpg)
Title: Re: Would Dave be interested in a mechanical calculator?
Post by: rob77 on December 24, 2014, 09:10:39 pm
Felix ! it's a beautiful device  :-+ 

found a review on youtube ;)

Felix ("??????") Russian Mechanical Arithmometer (calculator) (https://www.youtube.com/watch?v=g0uaq9oTpa4#)
Title: Re: Would Dave be interested in a mechanical calculator?
Post by: SeanB on December 25, 2014, 04:37:31 am
I have a feeling he would place it in a prominent position in the shelf, even if he never uses it. I doubt he will take it apart, as those are very hard to get back together, without having at least a manual and a few years of training in putting them together.
Title: Re: Would Dave be interested in a mechanical calculator?
Post by: pickle9000 on December 25, 2014, 05:59:53 am
Yes.
Title: Re: Would Dave be interested in a mechanical calculator?
Post by: tsmith35 on December 25, 2014, 07:00:19 am
Look at the detailed work that goes into constructing such machines. Amazing.

CURTA Calculator Assembly (https://www.youtube.com/watch?v=AnTb26WHx2Q)

Operation of these is really cool: How the CURTA Works (https://www.youtube.com/watch?v=loI1Kwed8Pk)
Title: Re: Would Dave be interested in a mechanical calculator?
Post by: SL4P on December 25, 2014, 08:45:42 am
Observation: I like the corrugated desk mat he uses.

Question:  How do mathemagicians / engineers come up with that complex recursive circular design - very clever.
I'm guessing they build out some of the prototype as a flat model, then visualize wrapping it into a cylinder.. nonetheless very clever.

Love retro mechatronics !
Title: Re: Would Dave be interested in a mechanical calculator?
Post by: Artlav on December 25, 2014, 08:56:23 pm
Operation of these is really cool: How the CURTA Works (https://www.youtube.com/watch?v=loI1Kwed8Pk)
Wow.
Now THAT is a cool mechanical calculator.
And it does everything of what that brick of mine can do...
Title: Re: Would Dave be interested in a mechanical calculator?
Post by: Dave Turner on December 25, 2014, 09:28:50 pm
We got taught how to use those back in the 1960's. Repetitive strain injury is not a modern phenomenon. Think about it though, it's really only a cut down Babbage difference engine!
Title: Re: Would Dave be interested in a mechanical calculator?
Post by: EEVblog on December 25, 2014, 10:15:23 pm
I doubt he will take it apart, as those are very hard to get back together, without having at least a manual and a few years of training in putting them together.

Yes, I wouldn't like to attempt to take it apart.
Title: Re: Would Dave be interested in a mechanical calculator?
Post by: tsmith35 on December 26, 2014, 10:47:22 am
We got taught how to use those back in the 1960's. Repetitive strain injury is not a modern phenomenon. Think about it though, it's really only a cut down Babbage difference engine!

Number crunching used to be much more physical... Babbage Difference Engine in Motion (https://www.youtube.com/watch?v=jiRgdaknJCg) :box:
Title: Re: Would Dave be interested in a mechanical calculator?
Post by: dexters_lab on December 26, 2014, 10:12:44 pm
thats nice bit of old tech, i think i want one
Title: Re: Would Dave be interested in a mechanical calculator?
Post by: SeanB on December 27, 2014, 07:58:09 am
I remember taking apart old mechanical adding machines where the whole mechanism consisted of notched levers, cams and a seemingly impossible to undo set of screws, rivets and all encased in a grease that had turned into something approaching wax over the decades.
Title: Re: Would Dave be interested in a mechanical calculator?
Post by: Richard Crowley on December 27, 2014, 08:34:09 am
Is there a list of calculators in the official collection (or review/teardown)?
I have a couple that Dave might find amusing, but dunno whether they would be redundant?
Title: Re: Would Dave be interested in a mechanical calculator?
Post by: quarks on December 27, 2014, 11:35:44 am
Whatever you do, I think it would be a shame to break this mechanical wonder.
Title: Re: Would Dave be interested in a mechanical calculator?
Post by: hamdi.tn on December 27, 2014, 02:13:29 pm
Whatever you do, I think it would be a shame to break this mechanical wonder.

agree with you, this is an awesome piece of engineering too perfect to be taken apart. Sorry dave  ;D
Title: Re: Would Dave be interested in a mechanical calculator?
Post by: Artlav on December 28, 2014, 12:17:41 am
Whatever you do, I think it would be a shame to break this mechanical wonder.
Well, my occasion flew on to Australia without stopping here, and the thing is not worth the cost of mailing it.
Looks like it stays put for the time being.

It's a bit faded and scratched (like someone was washing around the numbers over and over and over and over and over...), but is fully functional.
My 10 y.o. nephew loves it, for some reason he find it fascinating to see the numbers on a box full of cogs and gears to match up with the numbers on his cell phone's calculator. :)
(http://i.imgur.com/OYwFgDu.jpg)
Title: Re: Would Dave be interested in a mechanical calculator?
Post by: Red Squirrel on December 28, 2014, 04:31:55 am
Bet you wont find a single cheap Chinese capacitor from hung wang lo in there. :P
Title: Re: Would Dave be interested in a mechanical calculator?
Post by: SeanB on December 28, 2014, 05:06:28 am
Work out the postage cost in US dollars and I am sure that we could crowdfund it for you.