S.D.S.

iainalec · Post by **iainalec** » Thu Mar 15, 2007 8:01 am

Hello to everyone, my first question and you might think a daft one, but what does S.D.S. stand for.

:

uncle buck · Post by **uncle buck** » Thu Mar 15, 2007 8:47 am

Hello & welcome to the forum.

SDS = Spline Drive System

Post by **ultimatehandyman** » Thu Mar 15, 2007 9:01 am

In A manual that I have here it says it is a special direct system

I have seen quite a few different names for this abbreviation and so there are probably a few!

SDS drills are superb and are much better on masonry than rotary or percussion drills.

handyman · Post by **handyman** » Thu Mar 15, 2007 11:39 am

yes, sds drill bits go through hard bricks like they are butter, superb stuff.

Gadget · Post by **Gadget** » Thu Mar 15, 2007 2:00 pm

Or ....Slotted Drive Shaft!!........I've that many explanatios!!

dewaltdisney · Post by **dewaltdisney** » Thu Mar 15, 2007 6:50 pm

I believe it stands or Special Direct System. Bosch invented it iun teh 70's for their hammer drills. The system has gradually been adopted by all manufacturers. The German is Spezielles Drektes System

DWD

Hitch · Post by **Hitch** » Thu Mar 15, 2007 6:55 pm

Another vote for 'special direct system'

uncle buck · Post by **uncle buck** » Sun Mar 18, 2007 10:48 pm

Yes it is Special-Direct-System well done people.

http://ukptocs.bosch-pt.com/boptocs-uk/ ... at_id=7749

carhartt kid · Post by **carhartt kid** » Mon Mar 19, 2007 12:56 pm

http://en.wikipedia.org/wiki/Chuck_%28engineering%29

I always use wikipedia for answers! Bout half way down the page it has a lovely explanation!

Hinton Heating · Post by **Hinton Heating** » Mon Mar 19, 2007 1:31 pm

this one!

Special Direct System (SDS)
Developed by Bosch in 1975 for hammer drills, the SDS uses a cylindrical shank on the tool, with indents to be held by the chuck. A tool is inserted into the chuck by pressing in, and is locked in place until a separate lock release is used – no tightening required. The rotary force is supplied through wedges that fit into two or three open grooves. The hammer action actually moves the bit up and down within the chuck since the bit is free to move a short distance. Two sprung balls fit into closed grooves, allowing movement whilst retaining the bit. SDS relies on a tool having the same shank diameter as the chuck - there are three standard sizes:

SDS-Plus – a 10 mm shank with two open grooves held by the driving wedges and two closed grooves held by locking balls. This is the most common size and takes a hammer up to 4 kg. The wedges grip an area of 75 mm² and the shank is inserted 40 mm into the chuck.
SDS-top a 14 mm shank similar to SDS-plus, designed for hammers from 2 to 5 kg. The grip area is increased to 212 mm² and the shank is inserted 70 mm. This size is not common.
SDS-max – an 18 mm shank with three open grooves and locking segments rather than balls. It is designed for hammers over 5 kg. The wedges grip an area of 389 mm2 and the shank is inserted 90 mm.
Many SDS drills have a "rotation off" setting, which allows the drill to be used for chiselling.

The name SDS comes from the German "Steck – Dreh – Sitz" (Insert – Twist – Stay).

German-speaking countries may use "Spannen durch System" (Clamping System), though Bosch uses "Special Direct System" for international purposes.

dewaltdisney · Post by **dewaltdisney** » Mon Mar 19, 2007 2:35 pm

So I win the prize for first to post the right answer. (and I did not look it up

)

DWD