Core drills for a damp stone wall

[Dcf]

Anyone know of a core bit that will do damp stone walls?after spending 6 hours coring a hole through for a fan with it clogging up all the time due to the damp lime mortar in the wall.core I used was a Marcrist 750 I think which is usually spot on if it's dry of course.dont really want to go back to the hilti tct cores that king kong would struggle to hold onto when it jams in the wall

 

[telectrix]

stitch drill with a 16" masonry bit . then chisel.

 

[MarkieSparkie]

The only easy way to core drill damp stone wall is to use a professional wet core drill kit, like the Marcrist DM2 or 3. These use a water feed to lubricate the cutting surface and remove the cutting debris.