Hi all,

This may seem a very strange question but I’m hoping someone can answer it. I have had to rebuild an old SDS drill. It works great but I am stuck for one specification. What is the deflection n the drill bit when the drill is in hammer mode. I will try and explain, the drill fits into the chuck, it is then hit on the end by a hammer that is moved up and down inside the machine. This cause the drill bit to be thrown forward thus pushing the drill bit into the wall etc and acting like a hammer blow and a chisel bit. the bit I need to know if anyone has the infor is how far is the drill bit thrown forward. The bits of the drill have been gathered from all sorrts of old ones. At first the drill bit was being thrown forward so 10mm, I know this si excessive but what should I bring it down to. I thought 2-3mm would be about right.

Any help would be very very appriciated.

I’ve drawn a very simplified pic to help explain what i mean. You can see this at:

www.edcross.co.uk