Morse taper shanks, which are the best

[Meldonmech]

Hi Guys,
             Glancing at two of my drill chucks in the workshop, both no2 morse taper, I noticed one had a wasted section. I had seen shanks with with this wasting before, but today began to wonder which is the best for general use?
 
                                                   Cheers David

[John Lindo]

Wasted MT's are normally designed for heavy duty drilling and with a knock out tang.
the reason for the wasting is to reduce the surface area of the male/female and increase the
pressure.
It's very rare to find wasted type below #3MT
Most hobby machines are standard #2 MT other than the #3 MT in a mini lathe spindle.
and mills with the R8
John

[Meldonmech]

Hi John,

                 Thanks for your reply, you never stop learning, I new there must be a good reason.

                                            Cheers David