The Japanese had no problem using Metford rifling in their Arisaka rifles.
Used to have to explain to noobs on buying a surplus Arisaka, that it didn't have shot out bore, that's what the rifling was supposed to look like
The Japanese had no problem using Metford rifling in their Arisaka rifles.
I don't think it's the different cartridge that took the time. Rather it was converting all the drawings to imperial rather than metric. You end up having to effectively redesign the whole gun, as the chances of any metric measurement matching up exactly with it's imperial countpart are pretty low. Of course that could all have been avoided if they used metric micrometers and gauges.
Yes, it's covered in Decisions of the Comptroller of the Treasury, volume 11 and elsewhere.Mh are you sure ? I remember reading that Paul Mauser or better the Mauser company wanted this royalties but the US government insists on a single large sum and that what was payed . IIRC 250 000 $.
And how is a machinist who has only ever used imperial measurements going to interpret plans in metric measurements and produce a working product if he has no metric guages. Converting the plans for the Bren, HS 404 aircraft gun to imperiql was no trivial matter and took a considerable amount of time. In contrast the 7.92 and 15mm Besa machine guns were put into production quickly because B.S.A used the original plans and provided their workers with metric measuring equiment.Like using imperial or metric really makes a difference when using gaging or any other precision measuring equipment. Simply convert the metric to four decimal place measurements versus three decimal place metric. .0001" = .002mm or close enough. Metric isn't more precise. Its simply a more logical system. ISO and SAE ( I can't remember what British tolerance is called) tolerance systems serve the same purposes.
And how is a machinist who has only ever used imperial measurements going to interpret plans in metric measurements and produce a working product if he has no metric guages. Converting the plans for the Bren, HS 404 aircraft gun to imperiql was no trivial matter and took a considerable amount of time. In contrast the 7.92 and 15mm Besa machine guns were put into production quickly because B.S.A used the original plans and provided their workers with metric measuring equiment.