Re: [CAD_CAM_EDM_DRO] Re: Re:Lathe threading

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