On Tue, 28 Jul 2015 05:57:20 -0700 (PDT), Grokman Grokman
wrote:


Why did rotary hammer bits go from hex to SDS?
Seems like change for profit$ sake, but maybe there's a real reason.
Other dickless sages, like the worthless Whoyakidding and his castradi posse, are of course free to (worthlessly) chime in.

They're far more efficient for hammering, because the hammer drill
doesn't have to accelerate the chuck.

There were earlier types of sliding-shank bits, but SDS was the first
one that was really well engineered. They came out at about the time I
started at _American Machinist_, and I wrote a fairly long item about
them around that time, with performance data and comments from pros
who started using them.

--
Ed Huntress