Talk:Andrey Nartov

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Lathe invention(s)

This needs clarification and sourcing. He appears to have invented a form of gear-driven cross-slide that could be used for ornamental turning (i.e. in Holtzapffel's distinction of the term, as opposed to simple turning). This was used for the production of guilloché work (still a Russian favourite), specifically for medallions.

None of his innovations seem to have been relevant to engineering or screwcutting work. Nor did his lathe have a compound top slide (i.e. adjustable for angle).

Nor was this machine a duplicating lathe. It could make multiple identical pieces, but each one was made according to the setup, not copied from some master template.

If I have time tonight, I'll check Holtzapffel. Andy Dingley (talk) 14:33, 17 February 2010 (UTC)[reply]

>None of his innovations seem to have been relevant to engineering or screwcutting work.

Wrong. To make things clear: in Russia Nartov is considered an inventor of support. Support is a Russian term for the device depicted here. I am not very strong in the English lathe terminology, but it seems to describe the same thing as a mechanic carriage supporting a cutting tool. Specifically, the article in the Russian Wikipedia and one of the references describe Nartov invention as follows:

- Нартов разработал конструкцию первого в мире токарно-винторезного станка с механизированным суппортом и набором сменных зубчатых колёс (1738).
- Nartov developed the construction of the world's first screwcutting lathe with a mechanic support and a set of changable gears (1738).

Obviously, the lathe carriage appeared long before, but a mechanic carriage close to the modern type came to existence in the 18th century, and Nartov's mechanic carriage is the earliest reported, at least from what I have seen so far.

>Nor did his lathe have a compound top slide (i.e. adjustable for angle).

As seen from other Nartov's inventions, he wouldn't have problem with changing angles, and apparently "the set of changable gears" was used exactly for changing angles. But of course I don't know it for sure. Where from have you got your information about the details of Nartov's lathe?

The machine called "copying lathe" by Russian sources was a different type of lathe produced around 1717. It was indeed used to copy medallions and other artwork. Greyhood (talk) 17:18, 17 February 2010 (UTC)[reply]

Nor was this machine a duplicating lathe. It could make multiple identical pieces, but each one was made according to the setup, not copied from some master template - wrong. The book Nartov and his Theatrum Machinarium (ref added to article) has a diagram and description from which it is clearly seen that Nartov's copying lathe indeed copied from a template to a blank (in scale; the pattern was larger to provide for fine detail). A probe traced the template and the cutter did the cutting accordingly. Of course one can write "according to the setup", but the setup was just the insertion of the template. - Altenmann >talk 17:58, 6 August 2023 (UTC)[reply]

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