SDS drill speed?

[lanham]

I am buying an SDS drill from Screwfix as my Bosch hammer drill will not touch my walls. If I use a 10mm x 450mm drill to go through my outside wall, what sort of speed should I use? With a normal hammer drill it is best on a slow speed but does this apply to an SDS drill? Sorry if this is an obvious and stupid question.

Cheers

Brian

 

[^woody^]

Yes slow is good with SDS. It's the joules and impact rates that matter

 

[Deleted member 174758]

Most SDS drills run at a speed of 800 to 1000rpm. Whilst pretty much every drill on the market features variable speed you generally run at full speed except when starting a hole where a bit more control can sometimes be had by running more slowly just to get the hole started

 

[Doggit]

The speed on an SDS drill is controlled by the trigger, but as you increase the speed, you'll also increase the hammer action. So the trick is to start slow so that the drill doesn't slip around, and then increase the speed so that it starts to cut through the material you're drilling. Some bricks are softish, and you'll go through slow but quick, and some concrete will have you going at full speed, and getting nowhere fast. Trial and error

 

[JBR]

I found that starting off without the hammer action is a good idea, at least until the hole is sufficient to ensure the drill bit doesn't slip out. Then turn on the hammer action to get on with it.

 

[lanham]

Thanks gents, just the info I wanted

Brian

 

[phatboy]

Go through the plaster at high speed without the hammer/sds action, then turn on hammer/sds and a medium speed seems to work for me