Re: [CAD_CAM_EDM_DRO] Re: Re:Lathe threading

group You should live here in Canada we have both
costing me two Arms and both of my legs just to keep
up in the tool department "is that a 14mm or 1/2" "
--- James Owens <wotisname@...> wrote:

> Hi,
>
> I forgot to mention that the metric SI system we use
> here has a 60 degree
> thread form while the old Whitworth threads are 55
> degree. I have been
> repairing machine tools for over twenty-five years
> and have also come across
> a lot of bastard(this is not a swear-word when used
> in this context)
> threads. I never got the hang of the numbering
> system for threads or drill
> bits and can't get my head around what it is based
> on.
>
> > Its always a 14x2 or 8x1.25 ?
>
> The full notation would only usually be used if the
> thread size was not on
> the preferred thread list. For example 8x1.25mm is
> the preferred size but
> most bolts in a Japanese motorcycle that are 8mm are
> 1.00mm pitch and I have
> often seen bolts at 0.75 pitch. Not to forget that
> the thread could be
> courser.
>
> Regards,
>
> Terry
>
>
>
>

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