Re: [CAD_CAM_EDM_DRO] Spindle dimensions & tapers

John wrote:

> I was just looking through a catalogue with some machinery bits in and wonder how so many different types of tapers have come about and are in use? I can only think of R8, Morse and NT but I'm sure there's more. Who made these standards? And how come there's so many 'standards'? Does one design not have some sort of major mechanical benefit over the over? I've not seen many mills that use Morse tapers for their tooling, only drill presses.

Also, Brown & Sharpe (common on horizontal mills)
3C, 5C and 3AT (common on lathes)
and many, many more.

Most machine makers would try to sell machines to the newbies
with proprietary tapers, and every maker had several of their
own confounding tapers, as well as the established ones.
Just like software incompatibility, it locks you into one source
for tooling. When you go to purchase a 2nd machine, you realize
all those thousands of $ of tooling won't fit the new machine unless
you buy it from the same maker.

Jon